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    Credit: ESA-S. CorvajaPHOTOS: Soyuz rocket prepared for launchRussian engineers rolled a Soyuz rocket to the launch pad at the Guiana Space Center at 7:30 a.m. local time on Nov. 26 and hoisted the booster vertical on its launch mount.The Soyuz rocket rolled to the launch pad attached to a transporter-erector system riding on rail tracks.The fairing was lifted atop the Soyuz rocket inside the pad’s mobile service tower on later on Nov. 26. The nose shroud encloses the Pleiades 1B Earth observation satellite, a high-resolution imaging platform for the French space agency, the French military and Astrium Services.Liftoff is scheduled for Dec. 1 at 0202:50 GMT (9:02:50 p.m. EST; 11:02:50 p.m. local time on Nov. 30).Credit: CNES/ESA/ArianespaceRocketcams trace Soyuz launch from French GuianaSPACEFLIGHT NOWPosted: April 6, 2014 A suite of on-board cameras recorded dazzling views of Thursday’s successful Soyuz launch from the Guiana Space Center, supplying an unprecedented look at the workings of the venerable Russian rocket in flight.The rocketcams show the 151-foot-tall launcher lifting off from its purpose-built launch pad in French Guiana, the home base of Europe’s Ariane 5 rocket. Russia’s medium-lift Soyuz vehicle and the Italian-led Vega lightweight satellite booster joined Ariane at the Guiana Space Center in 2011 and 2012.Thursday’s launch lifted the Sentinel 1A satellite into orbit, beginning the multi-year deployment of Europe’s flagship Copernicus Earth observation system.Liftoff was at 2102:26 GMT (5:02:26 p.m. EDT; 6:02:26 p.m. local time).Developed in Germany by Keyser-Threde, the four on-board cameras show the Soyuz rocketing through low-level clouds, surpassing the speed of sound and releasing four kerosene-fueled boosters about two minutes after liftoff.The cameras also recorded separation of the Soyuz rocket’s second stage and payload fairing, which shielded the Sentinel 1A satellite during the early phase of flight.The footage includes release of the Soyuz rocket’s third stage from a Fregat upper stage, which ignited to propel the Sentinel 1A spacecraft into polar orbit. The sequence ends with a spectacular view from a forward-facing camera showing deployment of Sentinel 1A about 425 miles above the North Atlantic Ocean.See our for the latest news on the launch.Video credit: Arianespace/ESA/RoscosmosVideo credit: ArianespaceSentinel satellite’s first day in space was unusually tense SPACEFLIGHT NOWPosted: April 11, 2014 Europe’s newest Earth-watching satellite had to dodge an uncontrolled NASA spacecraft just after reaching orbit last week, putting engineers on edge until they could safely maneuver the nearly $400 million Sentinel 1A satellite out of the way. An on-board camera sent back this image of one of Sentinel 1A’s solar arrays and part of the satellite’s C-band radar antenna after deployment during the craft’s first stage in orbit. Photo credit: ESAEuropean Space Agency officials disclosed the close call and the nail-biting response by ground controllers in a blog post this week.The news of a potential collision came a day after Sentinel 1A’s April 3 aboard a Soyuz rocket from French Guiana.The nearly 2.4-ton satellite had just completed the complicated deployment of its solar panels and radar antenna, a critical phase in Sentinel 1A’s mission to supply European governments and scientists with timely data on oil spills, natural and man-made disasters, ice sheets and icebergs, and Earth’s climate.Sentinel 1A is the first satellite launched in the Copernicus program, a nearly $10 billion Earth observation initiative managed by ESA and the European Commission, the executive body of the European Union.”As the first day shift nears its end, a serious alert is received: there is a danger of a collision with a NASA satellite called ACRIMSAT, which has run out of fuel and can no longer be maneuvered,” officials wrote on an ESA blog.The U.S. Air Force tracks all objects in orbit bigger than a baseball and issues warnings to commercial and international satellite operators when space debris is predicted to fly close to operating spacecraft.There are now about 23,000 objects tracked by the Air Force, according to Gen. William Shelton, head of Air Force Space Command.With so many debris fragments, decommissioned satellites and spent rocket components flying around Earth, operational spacecraft are routinely tasked with maneuvering out of the path of space junk.In Sentinel 1A’s case, however, the warning came before engineers could fully activate the satellite’s systems, including its rocket thrusters, which were needed to adjust the craft’s orbit away from ACRIMSAT. Artist’s concept of Sentinel 1A in space. Photo credit: ESA/ATG medialabLate on the night of April 4, officials at Sentinel 1A’s control center in Darmstadt, Germany, received news there are two threatening close calls with ACRIMSAT on the following morning, including a predicted miss distance of just 20 meters, or about 66 feet.”This is serious,” says the ESA blog. “No Hollywood fiction, this is ‘Gravity’ for real!”When controllers were alerted of the projected brush with ACRIMSAT, Sentinel 1A was not yet in “normal pointing mode,” a milestone in the satellite’s commissioning phase that would allow the craft to maneuver in orbit.After hastily readying Sentinel 1A for the avoidance maneuver, controllers uplink commands for a 39-second rocket burn to safely move the satellite out of ACRIMSAT’s path.The maneuver occurred as planned at 0514 GMT (1:14 a.m. EDT) on April 4, when Sentinel 1A was out of communications with engineers on Earth.When the satellite re-established contact a few minutes later, the telemetry data stream showed Sentinel 1A had changed its orbit.”For the first time that night, loud laughs and cheers bursts through the room,” officials described in the blog post.Follow Stephen Clark on Twitter: .Final Shuttle Mission PatchFree shipping to U.S. addresses!The crew emblem for the final space shuttle mission is now available in our store. Get this piece of history!STS-134 PatchFree shipping to U.S. addresses!The final planned flight of space shuttle Endeavour is symbolized in the official embroidered crew patch for STS-134. Available in our store!Ares 1-X PatchThe official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.Apollo CollageThis beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.Project OrionThe Orion crew exploration vehicle is NASA’s first new human spacecraft developed since the space shuttle a quarter-century earlier. The capsule is one of the key elements of returning astronauts to the Moon.Fallen Heroes Patch CollectionThe official patches from Apollo 1, the shuttle Challenger and Columbia crews are available in the store. | | | | 2014 Spaceflight Now Inc.Six defense satellites launched by Soyuz rocket SPACEFLIGHT NOWPosted: December 17, 2011 A Russian Soyuz rocket fired six satellites into space Friday, launching missions to serve defense agencies in Europe and Chile with high-resolution imagery and electronic intelligence. The Soyuz rocket lifted off at 0203 GMT (9:03 p.m. EST). Credit: Arianespace/CNESThe passengers included France’s Pleiades 1 imaging platform, four French ELISA electronic intelligence satellites and the SSOT Earth observation satellite for Chile.Liftoff of the 151-foot-tall Soyuz launcher was at 0203:48 GMT (9:03:48 p.m. EST) from the Guiana Space Center on the northeast coast of South America. Lighting up the night sky with brilliant orange flame, the kerosene-fueled rocket dodged scattered clouds and flew north away from the French Guiana spaceport.The rocket’s core stages finished their job in less than 9 minutes, then a Fregat space tug guided the Pleiades and ELISA payloads to an orbit nearly 435 miles above Earth.The 2,138-pound Pleiades 1 satellite and four 265-pound ELISA spacecraft were deployed from the Fregat upper stage about one hour after launch.Two more brief firings of the Fregat main engine adjusted its altitude to 379 miles for the release of SSOT, a French-built imaging satellite for Chile’s government.Separation of SSOT was confirmed at about 0530 GMT (12:30 a.m. EST), and officials heralded the mission as a success.It was the second launch of a Soyuz booster from French Guiana using a new $800 million facility situated eight miles northwest of the spaceport’s existing Ariane rocket launch zone.”As you have just seen, the second launch of Soyuz from [French Guiana], which came less than two months after the first, has just put into orbit six spacecraft for our customers at the end of one of the most complex missions ever carried out,” said Jean-Yves Le Gall, chairman and CEO of Arianespace.With the Soyuz and Vega, which will make its first flight next month, Arianespace will operate rockets from French Guiana covering the light, medium and heavy launch markets. Artist’s concept of the Pleiades 1 satellite in orbit. Credit: EADS AstriumAll the payloads orbited by the Soyuz on Friday night were manufactured by EADS Astrium.”This is particularly significant for us at Astrium,” said Jean Dauphin, Astrium France’s director of Earth observation and science. “It’s quite a challenge and I have to say I’m really satisfied it was such a success.”Led by CNES, the French space agency, Pleiades 1 will collect high-resolution optical imagery for military and civilian users. CNES reported the Pleiades 1 satellite was acquired by ground stations and was operating normally soon after launch.”Pleiades is an Earth observation system with two 70-centimeter [2.3-foot] very high-resolution satellites for optical and infrared observation,” said Yannick d’Escatha, president of CNES. “The satellites, weighing one [metric ton], are placed in a sun-synchronous orbit 700 kilometers from the Earth. They have a four-meter [13.1-foot] span and are very agile, allowing for daily access to any point on the globe.”The Pleiades system is also partially funded by Belgium, Sweden, Spain and Austria. It will complement France’s Helios government spy satellites and the Spot series of commercial imaging craft.Spain and Italy will receive priority data for military needs under separate agreements with the French defense ministry. Civil users will receive about 95 percent of the capacity from the Pleiades system through Astrium Services, the company responsible for commercial imagery dissemination, but time-sensitive military requests will be expedited.”We have to meet the requirements of French and Spanish military users, as well as civil, institutional and commercial clients. Military tasking requests will take priority,” said Alain Gleyzes, a senior CNES manager with the Pleiades program.Italy and France share data from radar and optical observation satellites for defense purposes. The ORFEO agreement calls for imagery from Italy’s COSMO-SkyMed radar satellite system and France’s Pleiades optical program to be distributed to both nations.Designed for a five-year mission, the agile Pleiades satellites each carry a Korsch telescope built by Thales Alenia Space with a primary mirror 2.1 feet in diameter. Its CCD detectors are 40 times more sensitive to light than those in standard consumer digital cameras, according to CNES. Artist’s concept of the ELISA satellites in orbit. Credit: DGAOfficials say Pleiades 1 will be in its final orbit about 10 days after launch. When operational, it will collect up to 450 images each day, including tri-stereo imagery and mosaics.”These images will be used in France or in theaters of operations for activities such as site monitoring, targeting, urban mapping and the conduct of operations,” said French Gen. Laurent Collet-Billon, director of the military’s DGA procurement agency.Pleiades 2 is due for launch at the end of next year. Both satellites will cover every spot on the globe in 24 hours, according to French space officials.The ELISA satellite quartet will map radar emissions worldwide, characterizing and cataloging their sources for use in electronic warfare.”ELISA is a technology project to demonstrate mapping of ground radar signals from space,” said Nadege Roussel of DGA. “Satellites have the advantage of being able to view any point on the globe without encroaching on national airspace. France is the only European nation currently testing this type of space-based application.”The satellites will drift to their correct position in orbit over the next three months before testing begins.The ELISA program is a partnership between CNES, DGA, the French Joint Space Command and the military’s intelligence directorate.French Gen. Laurent Collet-Billon, director of DGA, said engineers will evaluate the technical performance of the ELISA satellites and incorporate the experience into the design of an operational signals intelligence satellite system to be launched by 2020.”Operations such as in Libya have shown to anyone who might still have doubts that space intelligence is absolutely essential for any country that wants to have a defense policy worthy of its name,” Collet-Billon said. Artist’s concept of the SSOT satellite in orbit. Credit: EADS AstriumChile’s SSOT satellite, based on the French Myriade platform, will collect 4.8-foot resolution imagery for security, mapping, urban planning, and agriculture applications.”It is a special night for us,” said Chilean Air Force Gen. Manuel Quinones, head of Chile’s military logistics command. “It is a night where our first operational satellite will be alive. It will help us in order to create more development in our country, and become a safer country as well in defense matters.”Astrium, the 258-pound craft’s prime contractor, trained Chilean engineers and provided satellite control and image processing systems to help operate the spacecraft from Santiago.Final Shuttle Mission PatchFree shipping to U.S. addresses!The crew emblem for the final space shuttle mission is now available in our store. Get this piece of history!STS-134 PatchFree shipping to U.S. addresses!The final planned flight of space shuttle Endeavour is symbolized in the official embroidered crew patch for STS-134. 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    Posted: July 7, 2014T-00:00:03Engines at Full ThrustThe five main engines of the Soyuz rocket’s core stage and four strap-on boosters are at full thrust.T-00:00:00LaunchProducing more than 900,000 pounds of thrust, the Soyuz 2-1b rocket soars into the sky from the Guiana Space Center.T+00:01:58Jettison BoostersThe Soyuz rocket’s four strap-on boosters, each powered by an RD-107A engine, are jettisoned after consuming their propellant.T+00:03:29Jettison FairingThe ST-type payload fairing is released from the Soyuz rocket when it reaches the edge of the upper atmosphere. The 13.5-foot-diameter fairing protects the payload during the launch countdown and the flight through the dense lower atmosphere.T+00:04:48Core Stage SeparationHaving burned its propellant, the core stage of the Soyuz rocket, also known as the second stage, separates and the third stage’s RD-0124 engine ignites to continue the flight.T+00:09:23Soyuz/Fregat SeparationThe Soyuz rocket’s third stage releases the Fregat upper stage just shy of orbital velocity.T+00:10:23First Fregat IgnitionThe hydrazine-fueled Fregat upper stage ignites to place the O3b satellites in a low-altitude parking orbit.T+00:14:20First Fregat ShutdownThe Fregat upper stage shuts down to begin a coast phase. The Fregat and O3b satellites should now be in an orbit with a high point of 141 miles, a low point of 95 miles and an inclination of 5.15 degrees.T+00:22:50Second Fregat IgnitionThe Fregat stage’s main engine fires for a second time to boost the O3b satellites into a transfer orbit.T+00:31:22Second Fregat ShutdownAfter a 8-minute, 32-second burn, the Fregat upper stage shuts down to begin an 81-minute coast phase.T+01:52:25Third Fregat IgnitionThe Fregat main engine ignites a third time to place the O3b satellites into a circular equatorial orbit.T+01:57:27Third Fregat ShutdownThe third Fregat burn ends after injecting the satellites in a 4,865-mile-high orbit.T+02:00:47First Spacecraft SeparationSpacecraft no. 2 and spacecraft no. 4 separate from a dispenser on the Fregat upper stage.T+02:16:03 (Varies)Fourth Fregat BurnThe Fregat main engine fires a fourth time to adjust its orbit for separation of the other two O3b satellites.T+02:22:27 (Varies)Second Spacecraft SeparationSpacecraft no. 1 and spacecraft no. 3 separate from a dispenser on the Fregat upper stage. The Fregat engine will fire again later to move the upper stage into a graveyard orbit.Data source: ArianespaceJohn Glenn Mission PatchFree shipping to U.S. addresses!The historic first orbital flight by an American is marked by this commemorative patch for John Glenn and Friendship 7.Final Shuttle Mission PatchFree shipping to U.S. addresses!The crew emblem for the final space shuttle mission is available in our store. Get this piece of history!Celebrate the shuttle programFree shipping to U.S. addresses!This special commemorative patch marks the retirement of NASA’s Space Shuttle Program. Available in our store!Anniversary Shuttle PatchFree shipping to U.S. addresses!This embroidered patch commemorates the 30th anniversary of the Space Shuttle Program. 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Credit: ESA/CNES/Arianespace/Optique du video CSG/JM GuillonThe flight began at 1927:03 GMT (3:27:03 p.m. EDT) with a fiery liftoff from the Guiana Space Center, a European-run spaceport on the northeast coast of South America. The 151-foot-tall Soyuz launcher disappeared into clouds over the jungle launch base, where inclement weather forced two delays in the mission – first from Monday due to unfavorable high-altitude winds, then a 33-minute delay Tuesday to wait for a storm to pass.The three-stage launcher, flying in a modern configuration with a digital flight control system and an upgraded RD-0124 third stage engine, deployed a Fregat upper stage about nine minutes after liftoff to complete the task of placing the four 1,543-pound satellites in an unusual 4,865-mile-high orbit over the equator.From there, the satellites will begin linking customers in developing countries with the global Internet infrastructure, according to O3b Networks Ltd., the startup communications firm which owns the spacecraft.”There is no better reward for Arianespace than seeing the happy faces of our customers in the front row,” said Stephane Israel, chairman and CEO of Arianespace, the French company responsible for marketing and operating Soyuz launcher missions from the Guiana Space Center.It was the second Soyuz rocket launch in less than two hours, coming after a similar Russian-built launcher took off from Kazakhstan with an Earth observation satellite.Officials declared both of Tuesday’s launches successful, and the four O3b satellites are healthy and deployed their power-generating solar panels after separation from the Soyuz rocket and Fregat upper stage, according to Sandrine Bielecki, a spokesperson for Thales Alenia Space, builder of the O3b spacecraft.Within about a week, controllers at Thales will guide the satellites into higher orbits about 5,000 miles above Earth, before activating each craft’s 10 Ka-band transponders and 12 antennas for about three weeks of payload testing.Then O3b officials will wait for another launch of four identical satellites on another Soyuz rocket in September. By late this year, the company aims to launch commercial service of the network, and with the addition of another four satellites next year, O3b will be on a path toward revolutionizing Internet access in the developing world, according to Steve Collar, CEO of O3b Networks, based in the Channel Islands.Collar said one of the first regions to receive access to O3b bandwidth will be the Cook Islands, a tiny island nation in the South Pacific bypassed by terrestrial fiber-optic networks.”That’s all about to change as we open the pipe and deliver about six times more capacity as the Cook Islands have had up to this point,” Collar said.In the coming years, O3b satellites will reach customers across the planet between 45 degrees north and south latitude. Officials say O3b offers the benefits of fiber-optic lines without the costs to maintain them.Founded in 2007 by high-technology entrepreneur Greg Wyler, O3b Networks has raised more than $1.3 billion in financing from shareholders and lenders, including SES, Google, HSBC and Liberty Global.O3b has ordered 12 satellites – including the four spacecraft launched Tuesday – from Thales Alenia Space and booked three Soyuz launches with Arianespace. Artist’s concept of the O3b satellites in orbit. Credit: Thales Alenia Space”For the last few years, our life at O3b has been about building stuff,” Collar said in a post-launch speech. “We’ve been building satellites, we’ve been building ground stations, we’ve been building infrastructure, we’ve been building our company, and from today, that all changes. From today, our business is about you guys,” he said, referring to O3b’s customers.O3b’s name stands for the “other 3 billion,” referring to the number of people beyond the reach of fiber connectivity.”The Internet is now established as the key infrastructure to support every sector of the economy and is a fundamental driver of innovation, productivity and economic growth,” Collar said. “It’s the most transformational technology of our time, and yet this transformational technology is not available to everyone. There are 2 billion people in the world who are connected, and over the next 10 years, a further 3 billion will connect for the first time.”Wyler, who attended the launch with his family, said O3b’s advantage lies in its architecture. O3b’s satellites will fly in an unique medium-altitude orbit well below geostationary communications satellites 22,300 miles above Earth.”You can reach everybody from space, but all the satellites at the time were geostationary, 36,000 kilometers [22,300 miles] in the sky, which meant your Internet traffic had to go all the way up in the sky, causing about a half-second to a second of delay.”Other fleets of communications satellites in lower-altitude orbits, such as the craft owned by Iridium and Globalstar, are designed to serve mobile communications and telephony markets, not broadband Internet.The problem of latency – the time it takes for messages to be sent and received – is solved by building the O3b satellite fleet closer to Earth than geostationary altitudes.”Unless the [satellites] are closer, you’re not going to have a good conversation,” Wyler said, adding O3b promises a latency of 123 milliseconds.O3b and SES, its prime shareholder, have secured rights to deploy up to 120 satellites in medium Earth orbit. If demand for O3b is sufficient, the company could order more satellites beyond the 12 craft already on contract.”I can see a time in the future where O3b will become the largest satellite company in the world,” said John Dick, O3b’s chairman.John Glenn Mission PatchFree shipping to U.S. addresses!The historic first orbital flight by an American is marked by this commemorative patch for John Glenn and Friendship 7.Final Shuttle Mission PatchFree shipping to U.S. addresses!The crew emblem for the final space shuttle mission is available in our store. Get this piece of history!Celebrate the shuttle programFree shipping to U.S. addresses!This special commemorative patch marks the retirement of NASA’s Space Shuttle Program. Available in our store!Anniversary Shuttle PatchFree shipping to U.S. addresses!This embroidered patch commemorates the 30th anniversary of the Space Shuttle Program. The design features the space shuttle Columbia’s historic maiden flight of April 12, 1981.Mercury anniversaryFree shipping to U.S. addresses!Celebrate the 50th anniversary of Alan Shephard’s historic Mercury mission with this collectors’ item, the official commemorative embroidered patch.Fallen Heroes Patch CollectionThe official patches from Apollo 1, the shuttle Challenger and Columbia crews are available in the store. | | | | 2014 Spaceflight Now Inc.Soyuz poised for multi-national military mission SPACEFLIGHT NOWPosted: December 16, 2011 A Soyuz rocket is set to launch from South America with six satellites Friday to serve European defense agencies and Chilean security authorities. The Soyuz rocket’s payloads include the Pleiades 1 satellite, pictured at top, and four ELISA electronic intelligence satellites, two of which are seen at bottom. Chile’s SSOT satellite is not visible because it is inside the adapter’s central cylinder. Credit: ArianespaceThe Russian booster is hauling France’s Pleiades 1 imaging platform, four French ELISA electronic intelligence satellites and the SSOT Earth observation satellite for Chile.Liftoff is set for 0203:08 GMT Saturday (9:03:08 p.m. EST Friday) from the Guiana Space Center, a European-run spaceport on the northeast coast of South America.It is the second Soyuz mission staged from French Guiana. Another launcher successfully delivered two European Galileo navigation satellites into orbit in October.The three-stage Soyuz rolled from an integration building to the launch pad Monday morning. The rocket’s nose shroud, payloads and Fregat upper stage were attached later Monday.The Soyuz 2-1a rocket, a modernized version of the Soviet-era launcher, will haul the payloads to different orbits in a more than three-hour mission.Friday night’s blastoff is the first polar orbit mission for the Soyuz from South America. The 151-foot-tall launcher will pitch north from the space center, flying over the Atlantic Ocean before reaching orbit.The orbit is sun-synchronous, meaning the satellites fly over regions of Earth at the same time each day. It is a coveted type of orbit for Earth observation satellites and users relying on consistent imagery of zones across the globe.The Soyuz will propel itself to space in less than 9 minutes, then the launcher’s Fregat upper stage will ignite twice to accelerate to an orbit nearly 435 miles high.The mission’s six satellite passengers are fitted to an ASAP-S adapter, a multi-spacecraft platform designed to accommodate auxiliary payloads above, below and around its perimeter.The 2,138-pound Pleiades 1 satellite, about the size of an SUV, will deploy from the Fregat rocket stage 55 minutes after liftoff. Four minutes later, the French government’s ELISA satellites will simultaneously release from the APAS-S adapter, according to Arianespace, the commercial operator of the Soyuz rocket.The Fregat will fire its engine two more times to lower its orbit to 379 miles before casting free the SSOT reconnaissance satellite for Chile about 3 hours, 26 minutes into the flight. Artist’s concept of the Pleiades 1 satellite in orbit. Credit: EADS AstriumPleiades 1 is the first two satellites developed by CNES, the French space agency, to serve military and civil users. The Pleiades system is also partially funded by Belgium, Sweden, Spain and Austria.Spain and Italy will receive priority data for military needs under separate agreements with the French defense ministry.Italy and France share data from radar and optical observation satellites for defense purposes. The ORFEO agreement calls for imagery from Italy’s COSMO-SkyMed radar satellite system and France’s Pleiades optical program to be distributed to both nations. The Pleiades satellites each carry a Korsch telescope with a primary mirror 2.1 feet in diameter. Its CCD detectors are 40 times more sensitive to light than those in standard consumer digital cameras, according to CNES.Built by Astrium of France, Pleiades 1 will collect up to 450 images per day with a peak resolution of 70 centimeters, or about 2.3 feet. CNES says special processing can sharpen the images to a resolution of 50 centimeters, or less than 20 inches, placing the satellite among the top commercial observation platforms worldwide.U.S. commercial satellites provide imagery with a resolution of 16 inches, but data for civilian customers are blurred to a resolution of about 20 inches to meet the U.S. government’s regulatory requirements. The U.S. Defense Department only receives the best imagery.Astrium Services will sell Pleiades imagery, along with data from the Spot satellite series, to commercial customers and governments beyond Europe. Artist’s concept of the ELISA satellites in orbit. Credit: EADS AstriumAstrium also manufactured the quartet of ELISA satellites and Chile’s SSOT spacecraft.The ELISA program is a partnership between CNES and the French defense procurement agency DGA. Each satellite weighs about 265 pounds.Flying together in orbit, the ELISA satellites will locate and characterize radar sites around the world during a three-year mission. 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The design features the space shuttle Columbia’s historic maiden flight of April 12, 1981.Mercury anniversaryFree shipping to U.S. addresses!Celebrate the 50th anniversary of Alan Shephard’s historic Mercury mission with this collectors’ item, the official commemorative embroidered patch. | | | | 2014 Spaceflight Now Inc.Soyuz rocket rolls to launch pad in French GuianaSPACEFLIGHT NOWPosted: April 1, 2014 Russian and European ground crews working in South America completed assembly of a Soyuz rocket on the launch pad Monday ahead of a Thursday liftoff to begin deployment of a multi-billion dollar Earth observing system.The Sentinel 1A spacecraft bolted atop the Soyuz rocket is the first of up to a dozen missions planned for launch before the end of the decade to supply data on Earth’s land surfaces, oceans and atmosphere to global scientists and European governments.The data will be instrumental to responding to threats such as climate change, natural disasters, or man-made incidents like oil spills.Liftoff is set for 2102:26 GMT (5:02:26 p.m. EDT; 6:02:26 p.m. local time) from the Soyuz launch pad at the Guiana Space Center, the European-run spaceport on the northern coast of South America.The launch will mark the seventh Soyuz mission to take off from French Guiana since October 2011.Weighing more than 4,700 pounds at liftoff, the Sentinel 1A satellite carries a C-band synthetic aperture radar to track changes in land cover, monitor sea ice and locate oil spills.The spacecraft was attached to the Soyuz rocket Monday evening after the three-stage rocket rolled to the launch pad from its integration building earlier in the day.The rollout operations began Monday around sunrise. Russian workers moved the three-stage rocket on a specialized transporter-erector system riding on rail tracks. By midday, the Soyuz was lifted vertical over the launch pad’s cavernous flame trench carved out of granite bedrock. The Sentinel 1A spacecraft, already enclosed inside the Soyuz rocket’s ST-type 13.5-foot-diameter payload fairing, arrived at the launch pad Monday evening before it was lifted into the facility’s 17-story mobile gantry for mating with the Soyuz third stage.The Soyuz fairing, Sentinel 1A payload and the mission’s Fregat-M upper stage are collectively referred to as the “upper composite” of the launcher.See our for the latest news on the mission.

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    STORY WRITTEN FOR & USED WITH PERMISSIONPosted: June 12, 2004Seven years after launch on a four-planet gravitational bank shot covering more than 2 billion miles, NASA’s $3.3 billion nuclear-powered Cassini probe – the most sophisticated robotic spacecraft ever built – has finally reached the solar system’s most spectacular target: The ringed planet Saturn. An artist’s concept shows the Cassini space probe at Saturn. Credit: NASA/JPLKicking off a four-year orbital study of nature’s own “lord of the rings,” Cassini flew past the strange moon Phoebe June 11, passing within 1,285 miles of the tiny satellite. Seen as a mere speck of light from Earth and a blurry orb from the Voyager 2 probe in 1981, Phoebe was revealed as an irregular, heavily cratered world that defies easy explanation. The Phoebe flyby was a priceless opportunity to study what may be a captured chunk of debris left over from the birth of the solar system. But it was just the opening act in one of the most scientifically rich voyages of planetary exploration ever attempted. “It is really, truly the flagship mission of our time,” said Carolyn Porco, chief of Cassini’s imaging team and an authority on Saturn’s rings. “We are exploring the richest planetary system available to us with this magnificent spacecraft, which is the most sophisticated suite of instrumentation ever taken into the outer solar system. So we are going to discover many things. “And on top of all of that, Saturn is the most alluring of all the planets, it’s the icon among planets and that’s where we’re going. … I think that people, from the email I’m getting from the public, are very jazzed about this mission. They do very much have the feeling that they are stowaways on this spacecraft.”

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    STORY WRITTEN FOR & USED WITH PERMISSIONPosted: January 12, 2005KENNEDY SPACE CENTER, Fla. (CBS) – In one of the boldest space missions ever attempted, a small European-built probe will slam into the atmosphere of Saturn’s mysterious moon Titan Friday for a two-and-a-half hour parachute descent to its smog-shrouded surface. An artist’s concept shows Huygens nearing Titan. Credit: ESABeaming pictures and a torrent of data to NASA’s Cassini Saturn orbiter, the flying saucer-shaped Huygens probe will give scientists their first close-up look at one of the largest expanses of unexplored territory in the solar system. Researchers are hopeful Huygens will answer their most pressing questions: whether hydrocarbons fall like rain and form pools of liquid ethane and similar compounds on the moon’s frigid surface; and what erosional or depositional processes are responsible for covering up impact craters and producing a relatively flat, mountain-free surface. No matter what Huygens actually sees on the surface, scientists expect to gain insights into the workings of a thick, complex atmosphere that in some respects mirrors Earth’s shortly after the planet’s birth. “We ought to be able to see a pretty good panorama of the area that the Huygens probe is going to land in,” Jonathan Lunine, a planetary scientist at the University of Arizona, said in a recent interview. “Those pictures will continue all the way down to the surface, they’ll be interrupted right at the end when the camera switches over to take what are called spectra, which will tell us about the composition of the surface. So we ought to be able to get a pretty good panorama to start with. “We ought to be able to see whether the probe came down in an area that’s mostly craters or other kinds of land forms. We ought to be able to get a hint of whether there might be pools or lakes of liquid in that area. It won’t be immediately apparent whether dark places are liquid or solid, but depending on where the probe lands, we might get some direct information on that. And we might see clouds in the sky toward the horizon. “There may be some detection of lightning,” he said, “although there probably isn’t a lot of lightning in Titan’s atmosphere. And then after impact, or touchdown, if the antennas aren’t pointed in a strange direction, we should be able to get some information about the surface. If we’re lucky enough to land in liquid, then the probe should be bobbing up and down and there’s a tilt meter that will tell us that. And we might be able to get samples of surface material because the probe will still be warm and anything like these liquid hydrocarbons will vaporize and go up into the sample inlets.”Huygens was released from Cassini on Christmas Eve, placed on a collision course with Titan that was set up to ensure the proper atmospheric entry angle. David Southwood, the European Space Agency’s science director, thanked NASA for the lift, saying “now all our hopes and expectations are focused on getting the first in situ data from a new world we?ve been dreaming of exploring for decades.”During flybys of Titan in late October and again in December, Cassini’s powerful cameras, an imaging radar system and other instruments mapped the surface in unprecedented detail, revealing a relatively flat terrain and unusual, sharply defined features that defied easy explanation. Only a handful of large crater-like circular structures were apparent and researchers did not see the sort of specular reflections one might expect from sunlight glinting off a liquid surface. Whether Huygens will detect standing lakes or pools is a major question mark going into Friday’s descent. So far, said Torrence Johnson, a Cassini imaging team member at the Jet Propulsion Laboratory in Pasadena, Calif., “we don’t have any evidence (for liquids).” “Just like we don’t have any clear evidence of something we know is a crater, there’s nothing there that anybody’s willing to hang their hat on yet that yes, we absolutely have a liquid surface,” he said in a telephone interview Monday. “What we saw (in the initial Cassini flybys), of course, was a surface that was much stranger than most of us thought we would see,” he said. “The real story so far has been the things we didn’t see.” Like large craters, hills or mountain ranges and obvious lakes or river-like structures. But that doesn’t mean liquids aren’t there. Just that Cassini didn’t spot them in its initial looks at the moon. “It’s a distinct possibility that I could be the very first scientist to carry out oceanography on an outer planet of the solar system,” said John Zarnecki, principal scientist for the Huygens Science Surface Package. “But equally the probe could land with a thud on hard ground or squelch into a morass of extraterrestrial slime – no one knows for sure. “In any event, the instruments onboard have been designed to handle a range of possibilities,” he said in a statement. “Let’s just say that, after a seven-year voyage and twenty years of planning, design and build, I will be extremely pleased to land, whatever the surface.” An artist’s concept shows Huygens descending on its parachute. Credit: ESAHuygens, if it survives long enough, should reveal the surface in sharp detail and send back a wealth of data about its thick atmosphere. But even that will not be enough to answer all the questions posed by the scientific community. “I think we’re going to have to wait several flybys, maybe even several years, before we get a really good indication of what’s going on,” said Carolyn Porco, the Cassini imaging team leader. “What Huygens will do, of course, is give us a very exquisitely detailed view of one place. So their information will (provide) the ‘ground truth’ for helping us interpret what we see.” Spinning at 7 rpm for stability, Huygens will slam into the atmosphere Friday at an altitude of 789 miles, traveling at some 12,400 mph. A thick carbon composite heat shield will protect the craft from the fierce heat of atmospheric friction – nearly 3,500 degrees – which will quickly slow the probe to more benign speeds. Maximum deceleration is expected to be around 16 Gs. When the velocity has dropped to about 870 mph, Huygens’ aft cover will be pulled away by a pilot chute and the spacecraft’s 27-foot-wide main parachute will deploy 2.5 seconds later. The main chute will be jettisoned 15 minutes later and from that point on, Huygens will ride beneath a smaller 9.8-foot-wide parachute. Impact on the surface at some 11 mph is expected about two-and-a-half hours after entry begins. Regardless of how long Huygens might survive on the surface, Cassini will sink below Titan’s horizon about 30 minutes after touchdown. Assuming the 705-pound Huygens doesn’t sink in a hydrocarbon lake, “we have good confidence the probe will survive landing,” said European Space Agency mission manager Jean-Pierre Lebreton. “The landing speed is very low.” Here is a detailed timeline of major entry events on Jan. 14 (in EST; all times represent when an event occurs relative to signals received on Earth). Explanations for key events from the European Space Agency’s ; Cassini timeline events provided by the :Jan. 1402:33 AM (-02h40m) – Cassini solid state recorders prepped for support02:45 AM (-02h28m) – Cassini transition to thruster control for relay02:55 AM (-02h18m) – Cassini: final recorder configuration for relay02:57 AM (-02h16m) – Turn on Probe receivers03:09 AM (-02h04m) – Cassini turns toward Titan03:21 AM (-01h52m) – Turn to Titan complete03:24 AM (-01h49m) – Cassini disables X-band downlink04:51 AM (-00h22m) – Probe turns transmitters on (low power mode)05:13 AM (-00h00m) – Probe reaches the discernible atmosphere: 789 miles05:16 AM (+00h03m) – Probe feels maximum deceleration05:17 AM (+00h04m) – Pilot chute: 106-118 miles altitude; Mach 1.5; The parachute deploys when Huygens detects that it has slowed to 895 mph, at about 112 miles above Titan’s surface. The pilot parachute is the probe’s smallest, only 8.5 feet in diameter. Its sole purpose is to pull off the probe’s rear cover, which protected Huygens from the frictional heat of entry. 2.5 seconds after the pilot parachute is deployed, the rear cover is released and the pilot parachute is pulled away. The main parachute, which is 27.2 feet in diameter, unfurls.05:18 AM (+00h05m) – At about 99 miles above the surface, the front shield is released. Forty-two seconds after the pilot parachute is deployed, inlet ports are opened up for the Gas Chromatograph Mass Spectrometer and Aerosol Collector Pyrolyser instruments, and booms are extended to expose the Huygens Atmospheric Structure Instruments. The Descent Imager/Spectral Radiometer will capture its first panorama, and it will continue capturing images and spectral data throughout the descent. The Surface Science Package will also be switched on, measuring atmospheric properties.05:32 AM (+00h19m) – Main parachute separates and drogue parachute deploys: The drogue parachute is 9.8 feet in diameter. At this level in the atmosphere, about 78 miles in altitude, the large main parachute would slow Huygens down so much that the batteries would not last for the entire descent to the surface. The drogue parachute will allow it to descend at the right pace to gather the maximum amount of data.05:49 AM (+00h36m) – Surface proximity sensor activated: Until this point, all of Huygens’s actions have been based on clock timers. At a height of 37 miles, it will be able to detect its own altitude using a pair of radar altimeters, which will be able to measure the exact distance to the surface. The probe will constantly monitor its spin rate and altitude and feed this information to the science instruments. All times after this are approximate.05:56 AM (+00h43m) – Possible icing effects to Probe (31 miles)06:57 AM (+01h41m) – Gas Chromatograph Mass Spectrometer begins sampling atmosphere: This is the last of Huygens’s instruments to be activated fully. The descent is expected to take 137 minutes in total, plus or minus 15 minutes. Throughout its descent, the spacecraft will continue to spin at a rate of between 1 and 20 rotations per minute, allowing the camera and other instruments to see the entire panorama around the descending spacecraft.07:19 AM (+02h06m) – Cassini closest approach: 37,282 miles flyby at 12,080 mph, 93 deg phase07:30 AM (+02h17m) – Descent Imager/Spectral Radiometer lamp turned on: Close to the surface, Huygens’s camera instrument will turn on a light. The light is particularly important for the ‘Spectral Radiometer’ part of the instrument to determine the composition of Titan’s surface accurately.07:34 AM (+02h21m) – Surface touchdown: This time may vary by plus or minus 15 minutes depending on how Titan’s atmosphere and winds affect Huygens’s parachuting descent. Huygens will hit the surface at a speed of 11.2-13.4 mph. Huygens could land on a hard surface of rock or ice or possibly land on an ethane sea. In either case, Huygens’s Surface Science Package is designed to capture every piece of information about the surface that can be determined in the three remaining minutes that Huygens is designed to survive after landing.09:44 AM (+04h31m) – Cassini stops collecting data; Huygens’s landing site drops below Titan’s horizon as seen by Cassini and the orbiter stops collecting data. Cassini will listen for Huygens’s signal as long as there is the slightest possibility that it can be detected. Once Huygens’s landing site disappears below the horizon, there’s no more chance of signal, and Huygens’s work is finished.09:46 AM (+04h33m) – Cassini probe data partitions write protected09:54 AM (+04h41m) – Cassini turns toward Earth09:57 AM (+04h44m) – Turn to Earth complete10:06 AM (+04h53m) – Critical sequence ends10:07 AM (+04h54m) – Post-Probe tracking begins (Canberra)10:14 AM (+05h01m) – First data sent to Earth: Getting data from Cassini to Earth is now routine, but for the Huygens mission, additional safeguards are put in place to make sure that none of Huygens’s data are lost. Giant radio antennas around the world will listen for Cassini as the orbiter relays repeated copies of Huygens data.10:17 AM (+05h04m) – Probe data replay begins (Canberra: 66,360 bps)12:57 PM (+07h44m) – End playback of first partition01:04 PM (+07h51m) – Ascending ring-plane crossing: 18.4 Saturn radii02:00 PM (+08h47m) – Start tracking at Madrid (142,200 bps)05:07 PM (+11h54m) – End first full playback of all Probe data08:29 PM (+15h16m) – Full data set on Earth (likely three hours earlier)10:35 PM (+17h22m) – Start tracking at GoldstoneJan. 1507:07 AM (+01d02h) – Power on of orbiter instruments08:30 AM (+01d03h) – End nominal playback of Probe dataCassini braked into orbit around Saturn on July 1 after a seven-year voyage from Earth. The original flight plan called for Huygens to enter Titan’s atmosphere in late November as Cassini streaked overhead at an altitude of just 746 miles. But engineers were forced to delay Huygens’ arrival to this month because of an issue with the radio aboard the Cassini mothership that will be used to relay data from Huygens to Earth. During a post-launch test, engineers discovered the radio receiver could not cope with the Doppler shift in the frequency of the signal coming from Huygens due to Cassini’s high relative velocity. Much like the pitch of a siren changes as a police car races past a stationary observer, the frequency of radio waves can shift a significant amount if relative velocities are high enough. “Originally, the closing speed of Cassini coming up on Huygens, which is for all practical purposes sitting still once it’s in the atmosphere, the closing speed was about 5.8 kilometers per second (13,000 mph),” Cassini program manager Bob Mitchell said in a recent interview. “And because we were coming in almost dead overhead and going off to the right at about 1,200 kilometers (746 miles) altitude.” The solution was to minimize the Doppler shift by reducing the relative velocities of the two spacecraft. That was accomplished by changing Cassini’s trajectory slightly and delaying Huygens’ release to Christmas Eve. During the Jan. 14 descent, Cassini now will be 37,300 miles from Titan and the difference in velocity between the two spacecraft will never be more than 8,500 mph. “We have pretty solid evidence that’s going to work,” Mitchell said. “We did some tests where we used the Deep Space Network stations transmitting an S-band signal with telemetry modulated onto the carrier so that from the receiver’s point of view on the Cassini spacecraft, it should have simulated the probe quite accurately. We adjusted the frequency, taking into account the motion of everything, so that the frequency of the received signal at the receiver should very closely if not exactly match the frequency that the receiver will see coming from Huygens.” The tests were successful and a potentially crippling design flaw was resolved with no significant loss of science. And so, the stage is set for a dramatic voyage of discovery. “Whatever is there is going to look pretty good, I think,” Johnson said. “The probe is spinning as it comes down, sort of a spin-scan imager looking out and down at an angle. Of course, the haze will get less as you go down. “We had hoped that once it got down to within a hundred kilometers of the surface or something like that we’d start seeing things that looked like pictures out of an airplane window. Based on our data, I think that maybe they will still see a very hazy surface even at longer wavelengths at that type of altitude. Because one of the things that we found is that some of the scattering that’s producing this fuzzy appearance on the surface is happening down under 10 kilometers. … But at some point, we ought to start seeing the surface more clearly. It may be in the last 10 kilometers of descent.” Johnson said he was especially looking forward to finding out “what sort of topography there is. Is it all flat down there? Or are there hints of underlying topography?” “I would hope we would be able to tell the difference between mantle material that’s been covered up by soft aerosols and areas where there might be really flat places with lakes, all of which could be hidden in the data we’re seeing now at the resolutions we have.” Whatever Huygens sees, “it could be pretty damn spectacular,” Johnson said. Huygens, of course, will send back much more than pictures. Here’s a summary from NASA’s Cassini press kit: “Throughout the descent, Huygens’ atmospheric structure instrument will measure the physical properties of the atmosphere,” according to NASA’s Cassini press kit. “The gas chromatograph and mass spectrometer will determine the chemical composition of the atmosphere as a function of altitude. The aerosol collector and pyrolyzer will capture aerosol particles – fine liquid or solid particles suspended in the atmosphere – heat them and send the resulting vapor to the chromatograph/spectrometer for analysis. “Huygens’ descent imager and spectral radiometer will take pictures of cloud formations and Titan’s surface and also determine the visibility within Titan’s atmosphere. As the surface looms closer, the instrument will switch on a bright lamp and measure the spectral reflectance of the surface. Throughout the descent, the Doppler shift of Huygens’ radio signal will be measured by the Doppler wind experiment onboard the Cassini orbiter to determine Titan’s atmospheric winds, gusts and turbulence. “As the probe is shifted about by winds, the frequency of its radio signal (will) change slightly in what is known as the Doppler effect – similar to how the pitch of a train whistle appears to rise and then fall as the train passes. Such changes in frequency can be used to deduce the wind speed experienced by the probe. “As Huygens nears impact, its surface science package will activate a number of sensors to measure surface properties. Huygens will impact the surface at about 15 miles per hour; the chief uncertainty is whether its landing will be a thud or a splash. “If Huygens lands in liquid, these instruments will measure the liquid’s properties while the probe floats for a few minutes. If Huygens lands in liquid ethane it will not be able to return data for very long, because the extremely low temperature of this liquid (about (-180 C (-290 F) would prevent the batteries from operating. “In addition, if liquid ethane permeates the probe’s science instrument packages, the radio would be badly tuned and probably not operate. Assuming Huygens continues to send data to Cassini from Titan’s surface, it will be able to do so for a maximum of about 30 minutes, when the probe’s battery power is expected to run out and the Cassini orbiter disappears over the probe’s horizon.”Ares 1-X PatchThe official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.Apollo CollageThis beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.Expedition 21The official embroidered patch for the International Space Station Expedition 21 crew is now available from our stores.Hubble PatchThe official embroidered patch for mission STS-125, the space shuttle’s last planned service call to the Hubble Space Telescope, is available for purchase. | | | | 2014 Spaceflight Now Inc.Radar image shows Titan’s surface live and in color CASSINI PHOTO RELEASEPosted: November 6, 2004Saturn’s moon Titan shows a sharp contrast between its smooth and rough edges in a new false-color radar image.Titan’s surface lies beneath a thick coat of hazy clouds, but Cassini’s radar instrument can peer through to show finer surface features. Scientists have added color to emphasize finer details on Titan, as shown in the image.To provide a better perspective of the surface features, the color image is shown next to a black-and-white image that was previously released. Credit: NASA/JPLDownload larger image version Brighter areas may correspond to rougher terrains, slopes facing the radar, or different materials. The pink colors enhance smaller details on the surface, while the green color represents smoother areas. Winding linear features that cut across dark areas may be ridges or channels, although their nature is not yet understood. A large dark circular feature is seen at the western (top left) end of the image, but very few features on Titan resembling fresh impact craters are seen. The area shown is in the northern hemisphere of Titan and is about 150 kilometers (93 miles) wide by 300 kilometers (186 miles) long. The image is a part of a larger strip created from data taken on Oct. 26, 2004, when the Cassini spacecraft flew approximately 1,200 kilometers (745 miles) above Titan’s surface. The radar instrument works by bouncing radio signals off Titan’s surface and timing their return. This is similar to timing the returning echo of your voice across a canyon to tell how wide the canyon is. Approximately 1 percent of Titan’s surface was mapped during the Oct. 26 flyby.The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA’s Science Mission Directorate, Washington, D.C. The radar instrument team is based at JPL.Cassini posterJust in time for the Cassini spacecraft’s arrival at Saturn, this new poster celebrates the mission to explore the ringed planet and its moons. 2005 CalendarThe 2005 edition of the Universe of the Hubble Space Telescope calendar is available from our U.S. store and will soon be available worldwide. This 12×12-inch calendar features spectacular images from the orbiting observatory.Moon panoramaTaken by Apollo 14 commander Alan Shepard, this panoramic poster shows lunar module pilot Edgar Mitchell as a brilliant Sun glare reflects off the lunar module Antares.Mars Rover mission patchA mission patch featuring NASA’s Mars Exploration Rover is now available from the Astronomy Now Store.Apollo 11 special patchSpecial collectors’ patch marking the 35th anniversary of the historic Apollo 11 moon landing is now available.Choose your store: – | | | | 2014 Spaceflight Now Inc.Radio telescopes will add to Huygens discoveries NATIONAL RADIO ASTRONOMY OBSERVATORY NEWS RELEASEPosted: December 25, 2004When the European Space Agency’s Huygens spacecraft makes itsplunge into the atmosphere of Saturn’s moon Titan on January 14,radio telescopes of the National Science Foundation’s NationalRadio Astronomy Observatory (NRAO) will help international teamsof scientists extract the maximum possible amount of irreplaceableinformation from an experiment unique in human history. Huygensis the 700-pound probe that has accompanied the larger Cassinispacecraft on a mission to thoroughly explore Saturn, its ringsand its numerous moons.The Robert C. Byrd Green Bank Telescope (GBT) in West Virginiaand eight of the ten telescopes of the continent-wide VeryLong Baseline Array (VLBA), located at Pie Town and Los Alamos,NM, Fort Davis, TX, North Liberty, IA, Kitt Peak, AZ, Brewster,WA, Owens Valley, CA, and Mauna Kea, HI, will directly receivethe faint signal from Huygens during its descent.Along with other radio telescopes in Australia, Japan, andChina, the NRAO facilities will add significantly to theinformation about Titan and its atmosphere that will be gainedfrom the Huygens mission. A European-led team will use the radiotelescopes to make extremely precise measurements of the probe’sposition during its descent, while a U.S.-led team willconcentrate on gathering measurements of the probe’s descentspeed and the direction of its motion. The radio-telescopemeasurements will provide data vital to gaining a fullunderstanding of the winds that Huygens encounters inTitan’s atmosphere.Currently, scientists know little about Titan’s winds. Datafrom the Voyager I spacecraft’s 1980 flyby indicated thateast-west winds may reach 225 mph or more. North-south windsand possible vertical winds, while probably much weaker,may still be significant. There are competing theoreticalmodels of Titan’s winds, and the overall picture is bestsummarized as poorly understood. Predictions of wherethe Huygens probe will land range from nearly 250 mileseast to nearly 125 miles west of the point where itsparachute first deploys, depending on which wind modelis used. What actually happens to the probe as it makesits parachute descent through Titan’s atmosphere will givescientists their best-ever opportunity to learn aboutTitan’s winds.During its descent, Huygens will transmit data from itsonboard sensors to Cassini, the “mother ship” that broughtit to Titan. Cassini will then relay the data back toEarth. However, the large radio telescopes will be ableto receive the faint (10-watt) signal from Huygensdirectly, even at a distance of nearly 750 million miles.This will not be done to duplicate the data collection,but to generate new data about Huygens’ position andmotions through direct measurement.Measurements of the Doppler shift in the frequency of Huygens’radio signal made from the Cassini spacecraft, in an experimentled by Mike Bird of the University of Bonn, will largelygive information about the speed of Titan’s east-west winds.A team led by scientists at NASA’s Jet Propulsion Laboratoryin Pasadena, CA, will measure the Doppler shift in the probe’ssignal relative to Earth. These additional Doppler measurementsfrom the Earth-based radio telescopes will provide importantdata needed to learn about the north-south winds.”Adding the ground-based telescopes to the experiment willnot only help confirm the data we get from the Cassiniorbiter but also will allow us to get a much more completepicture of the winds on Titan,” said William Folkner, aJPL scientist.Another team, led by scientists from the Joint Institute forVery Long Baseline Interferometry in Europe (JIVE), inDwingeloo, The Netherlands, will use a world-wide networkof radio telescopes, including the NRAO telescopes, to trackthe probe’s trajectory with unprecedented accuracy. Theyexpect to measure the probe’s position within two-thirds ofa mile (1 kilometer) at a distance of nearly 750 million miles.”That’s like being able to sit in your back yard and watchthe ball in a ping-pong game being played on the Moon,”said Leonid Gurvits of JIVE.Both the JPL and JIVE teams will record the data collected bythe radio telescopes and process it later. In the case of theDoppler measurements, some real-time information may beavailable, depending on the strength of the signal, but thescientists on this team also plan to do their detailed analysison recorded data.The JPL team is utilizing special instrumentation from the Deep SpaceNetwork called Radio Science Receivers. One will be loaned to the GBTand another to the Parkes radio observatory. “This is the sameinstrument that allowed us to support the challenging communicationsduring the landing of the Spirit and Opportunity Mars roversas well as the Cassini Saturn Orbit Insertion when the receivedradio signal was very weak,” said Sami Asmar, the JPL scientistresponsible for the data recording.When the Galileo spacecraft’s probe entered Jupiter’satmosphere in 1995, a JPL team used the NSF’s Very LargeArray (VLA) radio telescope in New Mexico to directly trackthe probe’s signal. Adding the data from the VLA to thatexperiment dramatically improved the accuracy of thewind-speed measurements.”The Galileo probe gave us a surprise. Contrary to somepredictions, we learned that Jupiter’s winds got strongeras we went deeper into its atmosphere. That tells us thatthose deeper winds are not driven entirely by sunlight, butalso by heat coming up from the planet’s core. If we getlucky at Titan, we’ll get surprises there, too,” said RobertPreston, another JPL scientist.The Huygens probe is a spacecraft built by the European SpaceAgency (ESA). In addition to the NRAO telescopes, the JPL DopplerWind Experiment will use the Australia Telescope National Facilityand other radio telescopes in Parkes, Mopra, and Ceduna, Australia;Hobart, Tasmania; Urumqi and Shanghai, China; and Kashima,Japan. The positional measurements are a project led by JIVE andinvolving ESA, the Netherlands Foundation for Research in Astronomy,the University of Bonn, Helsinki University of Technology, JPL,the Australia Telescope National Facility, the National AstronomicalObservatories of China, the Shanghai Astronomical Observatory, andthe National Institute for Communication Technologies in Kashima,Japan.The Joint Institute for VLBI in Europe is funded by the national researchcouncils, national facilities and institutes of The Netherlands (NWO andASTRON), the United Kingdom (PPARC), Italy (CNR), Sweden (Onsala SpaceObservatory, National Facility), Spain (IGN) and Germany (MPIfR). TheEuropean VLBI Network is a joint facility of European, Chinese, SouthAfrican and other radio astronomy institutes funded by their nationalresearch councils. The Australia Telescope is funded by the Commonwealthof Australia for operation as a National Facility managed by CSIRO.The National Radio Astronomy Observatory is a facility of theNational Science Foundation, operated under cooperative agreementby Associated Universities, Inc.Ares 1-X PatchThe official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.Apollo CollageThis beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.Expedition 21The official embroidered patch for the International Space Station Expedition 21 crew is now available from our stores.Hubble PatchThe official embroidered patch for mission STS-125, the space shuttle’s last planned service call to the Hubble Space Telescope, is available for purchase. | | | | 2014 Spaceflight Now Inc.Reading tale of ions in Saturn’s magnetosphere UNIVERSITY OF MARYLAND NEWS RELEASEPosted: July 2, 2004The Cassini spacecraft has barely begun its four-year tour around Saturn, but already a University of Maryland sensor is beginning to reveal new data about the immense magnetosphere of the ringed planet.Designed and built by scientists in the University of Maryland’s space physics group, the CHEMS (CHarge Energy Mass Spectrometer) sensor measures ions — positively charged atoms — in Saturn’s magnetosphere.A planet’s magnetosphere is the magnetic field and charged particle environment that surrounds it. The magnetosphere traps ions produced in and around a planet. And it shields a planet from, and interacts with, the solar wind – the high-speed stream of ionized particles flowing out in all directions from the Sun.”By determining the elemental composition and charge state of the ions within and around Saturn’s magnetosphere, CHEMS will identify the sources of the plasma found there and study the processes of plasma acceleration,” says Douglas C. Hamilton, a professor of physics at the University of Maryland and leader of the space physics team that designed and built the CHEMS sensor. “CHEMS has already yielded data indicating the plasma in Saturn’s magnetosphere consists mostly of hydrogen and oxygen ions and molecular ions derived from water,” says Hamilton. “This suggests that the plasma probably comes from the surfaces of Saturn’s icy moons and rings, and not from the atmosphere of Titan, which consists primarily of nitrogen.” Plasmas are the most common form of matter, comprising more than 99percent of the known visible universe including the Sun and other stars. These ionized gases generate and interact with magnetic and electric fields around planets, stars and other astrophysical environments. Plasma processes can accelerate some ions to incredible energies. Cosmic rays — which are some of the highest energy plasma particles — contain “signatures” of the birth and death of stars. Observing the properties of space plasmas and energetic particles provides scientists a rich source of information about the physical processes that energize these materials and the conditions that exist at the sites where this energizing takes place.Magnetospheric Imaging

  33. Adidas 11Questra at 7:35 am

    Animation shows Cassini firing its engine to enter orbit around Saturn. Credit: NASA TV/Spaceflight NowIf all goes well, Cassini will brake into orbit around Saturn the night of June 30, firing its main engine for a nerve-wracking 96.4 minutes. Another 51-minute rocket firing in late August will raise the low point of Cassini’s orbit and set the stage for a true voyage of discovery. Equipped with state-of-the-art telescopes, an imaging radar system and a battery of other powerful instruments, Cassini will spend at least four years orbiting the sixth planet from the sun, studying its rings in unprecedented detail, making high-resolution movies of its windy atmosphere, charting its magnetic field and mapping a host of icy moons. Saturn’s largest moon, Titan, will get special treatment in January when the European-built Huygens probe now bolted to Cassini’s hull makes a parachute descent to the surface through the moon’s smoggy atmosphere. Bigger than the planet Mercury, Titan is the only moon in the solar system with a thick atmosphere, one in which hydrocarbons fall as rain and liquid ethane pools on its ultra-cold surface. “Imagine a world that’s smaller than Mars and bigger than the planet Mercury, where the air is four times denser at its surface than the air in this room and the surface pressure is about the same as you’d experience at the bottom of a neighborhood swimming pool,” said Jonathan Lunine, a University of Arizona physicist and a member of the Cassini science team. “On that world, the distant sun is never seen and at high noon, things are no brighter than a partly moonlit night on the Earth. “Because of its great distance, the cold is so enormous that water is always frozen out of the atmosphere. Nitrogen is nearly so, but not quite. And the simplest organic molecule, methane, is there to take the place of water as a cloud former, possibly a rain maker and maybe even the stuff of lakes or seas of hydrocarbons. “The methane is lofted hundreds of miles above the surface of this world,” Lunine said before Cassini’s launch in 1997. “It’s cracked open by sunlight and cosmic rays and a menagerie of more complicated organics is produced from the methane and these then float down to the surface to accumulate over time, perhaps to depths of hundreds of meters or more. Volcanism and impacts shape the surface and provide energy to make ever more complex organic molecules in a planet-wide tapestry that is an organic chemist’s dream. “What I have described to you is Titan, the second largest moon in the solar system, nearly the largest. It was partly revealed to us by Voyager 1 in 1980. Through its many instruments, Voyager discovered and characterized a dense atmosphere around this cold world. Yet … Voyager’s cameras could not penetrate the organic haze and so we still do not know what awaits Cassini-Huygens at the end of its journey.” An artist’s concept shows the Huygens craft making its descent to Titan. Credit: ESABut in the years since Cassini’s launch, optical and radar observations from Earth have given scientists at least a hint of what the spacecraft might find. Scientists are convinced lakes or small oceans of liquid hydrocarbons exist on Titan, but not a globe-spanning sea. One way or the other, the European Space Agency’s Huygens probe should resolve the matter, perhaps even splashing down in one of the frigid pools. “Titan is almost certainly not the home of life today,” Lunine said. “But the organic chemical cycles that go on may constitute a chemical laboratory for replaying some of the steps that led to life on Earth. Titan is in some ways the closest analogue we have to the Earth’s environment before life began and this makes Titan very important.” The Cassini mother ship, meanwhile, will fly through 76 ever-changing orbits of Saturn over the next four years, using the gravity of Titan to warp its trajectory, setting up subsequent encounters. Forty-five flybys of Titan are planned, four of the moon Enceladus, two each for Iapetus, Rhea and Tethys and one each for Mimas, Hyperion and Dione. Put another way, Cassini will make more than 50 close passes by seven of Saturn’s 31 known moons. Flyby altitudes will be as low as 310 miles, but Titan encounters will be limited to about 590 miles to avoid possible aerodynamic effects from flying through the extreme upper reaches of its atmosphere. Cassini will use its dish antenna to make radar maps of Titan’s hidden surface. Special filters will be used to permit its cameras to glimpse the surface through specific spectral “windows.” While scientists aren’t sure what they will see, the mission could provide key insights into how life began on Earth. “Probably the most important thing that our generation can do is to understand the evolution of life in our solar system and throughout the universe,” said Charles Elachi, director of the Jet Propulsion Laboratory and leader of the Cassini radar experiment. “In a sense, Cassini will write one of those chapters … in the book of how life evolved in our universe.” And throughout the voyage, Cassini’s instruments will study Saturn itself, its rings and its space environment. Workers put final touches on Cassini at Kennedy Space Center prior to launch in 1997. Credit: NASA-KSC”This mission’s objective is a four-year, close-up study of the Saturnian system, including its atmosphere, the magnetosphere surrounding Saturn, those rings, its many icy moons and the large moon, Titan,” said Wesley Huntress, NASA’s associate administrator for space science at the time of Cassini’s launch. “The mission represents a rare opportunity to gain significant insights into major scientific questions about the creation of the solar system, pre-life conditions here on early Earth and just a host of questions about Saturn itself. “Saturn, its rings and its moon system hold clues to understanding the origin of our solar system,” he continued. “Its rings are a system are not too unlike the early solar nebula out of which our own planets formed. The processes that sustain that ring may yield information on processes of planetary formation and this information in turn can help us understand what happens around other stars as well.” Cassini is the most ambitious – and expensive – interplanetary project ever attempted, eclipsing even the dual Mars Viking orbiters and landers in inflation-adjusted total cost. Equipped with three nuclear power sources, 12 instruments, multiple radios, a pair of digital data recorders, two primary computers and more than 50 other subcomputers, Cassini is a marvel of late 20th Century engineering. Standing 22 feet tall and 13 feet wide, the six-ton spacecraft features a 13-foot wide communications and radar antenna, a 40-foot-long magnetometer boom, 22,000 wire connections, 7.5 miles of electrical cabling, 82 radioisotope heater units to keep its internal systems warm, 16 hydrazine thrusters for coarse attitude control, four reaction wheels for finer, gyroscopic attitude control and two main engines (one is a backup) for major course changes. This graphic highlights some of the key items on Cassini. Credit: NASA/JPLVirtually every major system and subsystem has redundant backup hardware and an army of computer programmers has developed complex software sequences that will enable Cassini to detect and correct faults on its own, without intervention from Earth. That’s not an option when it can take nearly 90 minutes for radio signals, traveling at 186,000 miles per second, to reach flight controllers, informing them of a problem. “At Saturn, worst case, there’s an hour and 30 minutes one-way light time,” said Julie Webster, lead spacecraft engineer at the Jet Propulsion Laboratory in Pasadena, Calif. “So by the time we send up a command and get confirmation back, it’s often three hours round-trip light time. The spacecraft has to be designed to take care of itself completely for a period of up to two weeks. And that’s for normal operations.” Said Lunine: “We’ve never sent a spacecraft with the kind of instrumentation, the variety and number of instruments and the power of the instruments to the outer solar system prior to Cassini. “It’s really a tour de force,” he said in an interview. “And it’s going to be, if all goes well, an incredibly exciting four years in the Saturn system. I think we’ll learn that this is more than just a solar system within a solar system. There are just things unique about the Saturn system – the rings, Titan, other aspects – that will make it an incredibly interesting place to explore. … Cassini should really knock our socks off.”MISSION PREVIEWStargaze II DVDThe Stargaze II DVD has arrived! It features over 65 minutes of all new videos of the universe with newly-composed dolby digital and DTS 5.1 Channel surround sound music. Choose your store: – – – Solar system poster This new poster is popular for classrooms and children’s bedrooms. It includes interesting facts and figures about the planets and their moons. Choose your store: – – – Apollo 15 DVD Relive on DVD the journey of Apollo 15, one of the great explorations of our time. This unique six-disc DVD set contains all the available television and 16mm film footage from the mission.Choose your store: – – – Shuttle patchesCollect the official mission patches for the first ten space shuttle flights and save off the regular price. Introducing the Space Shuttle Patch Collection.Choose your store: – – – | | | | 2014 Spaceflight Now Inc.Spaceflight Now +Premium video content for our Spaceflight Now Plus subscribers.Cassini updateMission managers and scientists provide an update on the Cassini mission and preview the spacecraft’s arrival at Saturn during this news conference from June 29. (51min 58sec file)Phoebe science briefingScientists report scientific results from the Cassini spacecraft’s close-up examination of Saturn’s moon Phoebe. (31min 53sec file)Phoebe flyby previewThis animation shows Cassini during its encounter with the tiny moon Phoebe on the route to Saturn. (42sec file)Cassini previewThe Cassini spacecraft’s arrival at Saturn is previewed in this detailed news conference from NASA Headquarters on June 3. (50min 01sec file)Saturn arrival explainedCassini’s make-or-break engine firing to enter orbit around Saturn is explained with graphics and animation. Expert narration is provided by Cassini program manager Robert Mitchell. (3min 33sec file)Cassini scientists ready for first close Titan flyby UNIVERSITY OF ARIZONA NEWS RELEASEPosted: October 25, 2004The Cassini spacecraft is heading for its first close encounter with Saturn’s moon Titan. University of Arizona scientists on the mission say Cassini will get its first real glimpse of Titan surface geology and digest its first gulp of rich Titan air.The Oct. 26 flyby is the first of Cassini’s 45 close Titan passes over thenext four years. Scientists will combine unique types of informationfrom a dozen instruments on the orbiter for new insights on Titan,Saturn’s largest and most exotic moon. The NASA spacecraft will deploy theEuropean SpaceAgency’s Huygens probe to Titan in December. The probe,carrying six instruments, will descend through Titan’s atmosphere inJanuary 2005.UA’s Cassini scientists will be at NASA’s Jet Propulsion Laboratory inPasadena, Calif., this week for this first close Titan flyby.Cassini imaging cameras will photograph Titan every 15 minutes or soduring approach, said Alfred S. McEwen, a member of the Cassini imagingteam. “We’ll get a movie of Titan’s very interesting clouds. They form anddissipate and blow in the wind. Some of them are strange shapes andstreaks and things we really don’t understand.”Then, as we get closer, we’ll start mapping. We’ll make a full disk,four-color mosaic. We’ll see the surface, we’ll see the limb hazes,we’ll see whatever clouds there are,” McEwen said. “These are things we’llmake posters of, and that everyone will have on their walls.””As we get closer and closer, we map specific regions at higher andhigher resolution. This includes a mosaic over the Huygens landing site.It should be our best look at that location,” McEwen said.Cassini cameras will continue snapping high-resolution pictures ofdifferent Titan terrains as the spacecraft zooms on to Titan’s night side.Cassini imaging operations involve an international team of scientistsheaded by Carolyn Porco, UA adjunct professor of planetary sciences.Porco directs the Space Science Institute in Boulder, Colo. Most of theuplink and downlink imaging tasks are handled at the Boulder facility.”The Titan imaging atmosphere observations for the upcoming flybyhave been planned by scientists at the Jet Propulsion Laboratory andsequenced in Boulder,” Porco said. “But the very close observations, thosewith the goal of mapping the Titan surface at between 50 and 200 metersper pixel, have all been planned, designed and sequenced by our teammembers at the Lunar and Planetary Laboratory. It’s a very challengingtask to plan imaging sequences during a close flyby when the geometry ischanging rapidly. And they’ve done an excellent job. We’re in for quite ashow.”Robert H. Brown leads Cassini’s visual and infrared mapping spectrometer(VIMS) team, based at UA’s Lunar and Planetary Lab in Tucson. “We know VIMSwill see through the haze to Titan’s surface,” Brown said. “At closestapproach – 1,200 kilometers (745 miles) – we’ll have 600-meter-pixelresolution. We’ll be able to see very small geologic features. We’llget very high resolution looks at atmospheric phenomena, too. But frommy perspective, the really important thing about this encounter isreally digging down below the atmosphere and getting our first realglimpse of Titan geology.”We don’t know what we’re going to encounter there. I suppose you canassume we’ll see common geologic forms like mountains and craters andtectonic faults, maybe even volcanism,” Brown said.Titan is possibly the land of a thousand hydrocarbon lakes. UA planetarysciences and physics Professor Jonathan I. Lunine theorized as agraduate student more than 20 years ago that Titan could have liquidhydrocarbon seas or lakes. Lunine is the only U.S. scientist selected bythe European Space Agency for its three-member Huygens probeinterdisciplinary science team. He and Ralph Lorenz of UA’s Lunar andPlanetary Laboratory also are members of the radar team. Cassini will getits first radar images of Titan on tomorrow’s flyby.”If either the radar or VIMS system on the orbiter take images ofliquid-filled crater basins, that to me would be very, veryexciting,” Lunine said. Scientists would then have evidence that surfacelakes are a source and sink for methane in Titan’s hydrologic cycle.VIMS will see Titan’s hydrocarbon pools, if they exist and aren’thidden by some low-lying fog or other strange phenomenon, Brown said.VIMS team member Caitlin Griffith said, “Closest approach will giveus the most exciting VIMS data because we have that clear view down to thesurface. We want to isolate different terrain types and start seeingtexture.”When the Cassini spacecraft flew within 339,000 kilometers (210,600miles) of Titan in July, VIMS was so far away that everything it saw wassmeared over 150 kilometers (93 miles), Griffith said. “That’s like takinga picture of Arizona but smearing all of Tucson with all of Phoenix andbeyond, towards Flagstaff. This time, we’ll be close enough to isolate andidentify lakes and mountains, and maybe see shadows cast at differentillumination angles.”Cassini won’t just look at Titan next Tuesday. Cassini’s Ion andNeutral Mass Spectrometer (INMS) will taste mysterious, subtle flavors inTitan’s atmosphere, team member and UA planetary sciences Professor RogerYelle said.”Our instrument will scoop up a breath of Titan’s puffy atmosphereduring the flyby,” Yelle said. The experiment will measure how manymolecules of different masses it got in the gulp of Titan’s mostlynitrogen, methane-laced atmosphere.”Scientists with telescopes have so far seen 19 different chemicalmolecules in Titan’s atmosphere — more than in any other solar systembody’s atmosphere except Earth’s,” Yelle said. Laboratory experiments showthere are probably many more kinds of chemicals in Titan’s atmosphere, headded.Yelle and other INMS scientists want to identify the big, complicated andinteresting hydrogen-and-carbon-containing molecules because theyare part of a planetary system that possibly rains methane and producesethane ponds. “Titan is a big laboratory where you get to play withatmospheres on planetary scales,” Yelle said.In addition, Yelle said, he is fascinated by Titan chemistry as ascientist interested in the origins of life.Learning more about how carbon-containing, or “organic,” moleculesform doesn’t explain how DNA came to be, Yelle said. “A single strand ofDNA contains about 3 billion nucleotides that if stretched out, would besomething like 1.7 meters long. We’re trying to understand moleculeswith just 10 or 12 atoms.”But Titan’s hydrocarbon chemistry holds clues that explain the veryfirst steps of how nature assembled organic molecules, which are theprecursors to amino acids, the building blocks of life, he said.The Cassini-Huygens mission is a cooperative project of NASA, theEuropean Space Agency and the Italian Space Agency. The Jet PropulsionLaboratory, a division of the California Institute of Technology inPasadena, manages the Cassini-Huygens mission for NASA’s Office of SpaceScience, Washington, D.C. The Cassni orbiter and its two onboard cameraswere designed, developed and assembled at JPL. The imaging team is basedat the Space Science Institute, Boulder, Colo. The visual and infraredmapping spectrometer team is based at the University of Arizona Lunar andPlanetary Laboratory, Tucson, Ariz.Ares 1-X PatchThe official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.Apollo CollageThis beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.Expedition 21The official embroidered patch for the International Space Station Expedition 21 crew is now available from our stores.Hubble PatchThe official embroidered patch for mission STS-125, the space shuttle’s last planned service call to the Hubble Space Telescope, is available for purchase. | | | | 2014 Spaceflight Now Inc.Cassini sees Atlas, Pandora and Janus orbiting Saturn CASSINI PHOTO RELEASEPosted: November 17, 2004Saturn hosts its own miniature solar system, with an entourage of more than 30 moons. This image shows Saturn’s A and F rings, along with three of the moons that orbit close to them. Credit: NASA/JPL/Space Science InstituteDownload larger image version From innermost to outermost, tiny Atlas (32 kilometers, or 20 miles, across) orbits just outside of the bright A ring and is seen above center in this view. Prometheus (102 kilometers, or 63 miles, across) is visible near lower right. Prometheus and its smaller cohort, Pandora, shepherd the thin, knotted F ring. Finally Janus (181 kilometers, or 112 miles, across) can be seen near lower left. Janus shares its orbit with the moon Epimetheus. Density waves due to Janus cause some of the bright bands seen in the A ring in this image. Prometheus and Atlas also produce waves in the rings, but their wave regions are too narrow to be seen here. The interactions of the moons with each other and the rings are a major target of study for the Cassini mission. The planet’s shadow stretches all the way across the main rings in this view. The shadow has an oval shape at present, but over the next few years will become more rectangular as the planet orbits the Sun and the angle at which sunlight strikes the rings decreases.The image was taken with the Cassini spacecraft narrow angle camera on Oct. 6, 2004, at a distance of 6.4 million kilometers (4 million miles) from Saturn through a filter sensitive to wavelengths of visible red light. The image scale is 38 kilometers (24 miles) per pixel. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA’s Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo. Cassini posterJust in time for the Cassini spacecraft’s arrival at Saturn, this new poster celebrates the mission to explore the ringed planet and its moons. 2005 CalendarThe 2005 edition of the Universe of the Hubble Space Telescope calendar is available from our U.S. store and will soon be available worldwide. This 12×12-inch calendar features spectacular images from the orbiting observatory.Moon panoramaTaken by Apollo 14 commander Alan Shepard, this panoramic poster shows lunar module pilot Edgar Mitchell as a brilliant Sun glare reflects off the lunar module Antares.Mars Rover mission patchA mission patch featuring NASA’s Mars Exploration Rover is now available from the Astronomy Now Store.Apollo 11 special patchSpecial collectors’ patch marking the 35th anniversary of the historic Apollo 11 moon landing is now available.Choose your store: – | | | | 2014 Spaceflight Now Inc.Cassini sees crescent Rhea CASSINI PHOTO RELEASEPosted: July 21, 2004The first artificial satellite in the Saturn system, the Cassini spacecraft, returned images of the natural moons following a successful insertion into orbit. This is an unmagnified view of the moon Rhea. Credit: NASA/JPL/Space Science InstituteDownload a larger image version With a diameter of 1,528 kilometers (950 miles) across, Rhea is Saturn’s second largest moon. The Voyager spacecraft found that like Dione, Rhea has one of its hemispheres covered with bright, wispy streaks which may be water frost. This view shows a heavily cratered surface, and thus it is most likely ancient. Many of the craters visible here have central peaks. Cassini soon will look for clues to help unlock the moon’s geologic history. The spacecraft is slated to fly by Rhea at a distance of only 500 kilometers (311 miles) on Nov. 26, 2005. The image was taken in visible light with the Cassini spacecraft narrow angle camera on July 2, 2004, from a distance of about 990,000 kilometers (615,000 miles) from Rhea and at a Sun-Rhea-spacecraft, or phase angle of about 109 degrees. The image scale is 6 kilometers (4 miles) per pixel. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA’s Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo. Ares 1-X PatchThe official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.Apollo CollageThis beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.Expedition 21The official embroidered patch for the International Space Station Expedition 21 crew is now available from our stores.Hubble PatchThe official embroidered patch for mission STS-125, the space shuttle’s last planned service call to the Hubble Space Telescope, is available for purchase. | | | | 2014 Spaceflight Now Inc.Cassini sees objects, density waves in Saturn’s rings UNIVERSITY OF COLORADO-BOULDER NEWS RELEASEPosted: November 9, 2004A University of Colorado at Boulder-built instrument riding on the Cassini-Huygens spacecraft is being used to resolve objects in Saturn’s rings smaller than a football field, making them twice as sharp as any previous ring observations. This false color image of two density waves in Saturn’s A ring was made from the stellar occultation observed by Cassini’s ultraviolet imaging spectrograph. Bright areas indicate the denser regions of the rings. The bright bands in the left part of the image are the “peaks” of a density wave caused by gravitational stirring of the rings by Saturn’s moon, Janus. A smaller density wave in the right half of the image is produced by the moon Pandora. The ultraviolet imaging spectrograph observed the brightness of the star Xi Ceti as the rings passed in front of it, and the flickering of the starlight was converted into the ring density depicted by the image. The image represents a distance of about 724 kilometers (450 miles), and the smallest features are about one-half mile across. Credit: NASA/JPL/University of Colorado at BoulderDownload larger image version Joshua Colwell of CU-Boulder’s Laboratory for Atmospheric andSpace Physics said the observations were made with UltravioletImaging Spectrograph, or UVIS, when Cassini was about 4.2 millionmiles, or 6.75 million kilometers, from Saturn in July. Saturnorbits the Sun roughly 1 billion miles distant from Earth.Colwell and his colleagues used a technique known as stellaroccultation to image the ring particles, pointing the instrumentthrough the rings towards the star, Xi Ceti. The fluctuations ofstarlight passing through the rings provide information on thestructure and dynamics of the particles within them, said Colwell, aUVIS science team member.He likened the Saturn system to a mammoth phonograph record,with the planet in the middle and the rings stretching outward morethan 40,000 miles, or 64,000 kilometers. The size of the ringparticles varies from dust specks to mountains, with most rangingbetween the size of marbles and boulders, he said.The Cassini observations show dramatic variations in thenumber of ring particles over very short distances, Colwell said.The particles in individual ringlets are bunched closely together,with the amount of material dropping abruptly at the ringlet edge.”What we see with the new observations is that some of thering edges are very sharp,” said Colwell. The sharp edges of smallringlets are especially evident in the C ring and in the so-calledCassini Division on either side of the bright B ring, Saturn’slargest ring.The Cassini observations with UVIS show that the distancebetween the presence and absence of orbiting material at some ringedges can be as little as 160 feet, or 50 meters, about the length ofa typical commercial jetliner, he said.The sharp edges illustrate the dynamics that constrain thering processes against their natural tendency to spread into nearby,empty space, said Colwell. “Nature abhors a vacuum, so it is likelygravity from a nearby small moon and ongoing meteoroid collisionsconfine the particles in the ring.”Colwell presented his findings at the 36th annual Division ofPlanetary Sciences Meeting held in Louisville, Ken. Nov. 8 to Nov 12.The stellar occultation process using UVIS also shows veryhigh-resolution views of several density waves visible in the rings,including a previously unstudied one, he said. Density waves areripple-like features in the rings caused by the influence of Saturn’smoons — in this case, the small moon, Janus.”Small moons near Saturn’s rings stir the ring particles withtheir gravitational pull,” Colwell said. At certain locations in therings, known as resonances, the orbit of a particular moon matches upwith the orbit of certain ring particles in a way that enhances thestirring process, he said.The density waves, which resemble a tightly wound spiral muchlike the groove in a phonograph record, slowly propagate away fromthe resonance toward the perturbing moon, he said. “This can createa wave in the ring that looks like a ripple in a pond,” said Colwell.”The shapes of these wave peaks and troughs help scientistsunderstand whether the ring particles are hard and bouncy, like agolf ball, or soft and less bouncy, like a snowball,” Colwell said.He noted that a density wave analysis by scientists involved inNASA’s Voyager 2 mission that visited Saturn in 1981 were used todetermine the mass and thickness of the planet’s rings.The Cassini-Huygens mission is a cooperative project of NASA,the European Space Agency and the Italian Space Agency. The JetPropulsion Laboratory, a division of the California Institute ofTechnology in Pasadena, manages the Cassini-Huygens mission forNASA’s Science Mission Directorate, Washington, D.C.CU-Boulder Professor Larry Esposito of LASP is the principalinvestigator for the $12.5 million UVIS instrument, designed andbuilt for JPL at CU-Boulder.Cassini posterJust in time for the Cassini spacecraft’s arrival at Saturn, this new poster celebrates the mission to explore the ringed planet and its moons. 2005 CalendarThe 2005 edition of the Universe of the Hubble Space Telescope calendar is available from our U.S. store and will soon be available worldwide. This 12×12-inch calendar features spectacular images from the orbiting observatory.Moon panoramaTaken by Apollo 14 commander Alan Shepard, this panoramic poster shows lunar module pilot Edgar Mitchell as a brilliant Sun glare reflects off the lunar module Antares.Mars Rover mission patchA mission patch featuring NASA’s Mars Exploration Rover is now available from the Astronomy Now Store.Apollo 11 special patchSpecial collectors’ patch marking the 35th anniversary of the historic Apollo 11 moon landing is now available.Choose your store: – | | | | 2014 Spaceflight Now Inc.Cassini sees the moon Tethys: The Sea Goddess CASSINI PHOTO RELEASEPosted: July 23, 2004Like a half-full moon, cratered Tethys hangs before the Cassini spacecraft in this narrow angle camera view taken on July 3, 2004. Credit: NASA/JPL/Space Science InstituteDownload a larger image version Voyager images showed a large fracture on Tethys about 750 kilometers (470 miles) long (not seen in this view). Cassini will investigate this and other features on Tethys during two planned flybys, the first occurring on September 24, 2005. Tethys is 1,060 kilometers (659 miles) across. The image was taken in visible light from a distance of 1.7 million kilometers (1 million miles) from Tethys and at a Sun-Tethys-spacecraft, or phase angle of about 97 degrees. The image scale is 10 kilometers (6 miles) per pixel. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA’s Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo. Ares 1-X PatchThe official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.Apollo CollageThis beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.Expedition 21The official embroidered patch for the International Space Station Expedition 21 crew is now available from our stores.Hubble PatchThe official embroidered patch for mission STS-125, the space shuttle’s last planned service call to the Hubble Space Telescope, is available for purchase. | | | | 2014 Spaceflight Now Inc.Cassini shows the dark side of Saturn’s moon Dione CASSINI PHOTO RELEASEPosted: July 19, 2004The icy, cratered surface of Saturn’s moon Dione shows more than just its sunlit side in these two processed versions of the same image. Credit: NASA/JPL/Space Science InstituteDownload a larger image version The view at left, with only mild enhancement, shows a romantic crescent with large craters visible. The contrast in the version at the right has been greatly enhanced to show the side of Dione lit faintly by reflected light from Saturn. A similar phenomenon can be seen from Earth, when the Moon’s dark side is visible due to “earthshine.” The crater at the top of the image appears to have a sunlit central peak in the enhanced view — a common characteristic of craters on Dione as seen in Voyager images. Slight variations in brightness on the moon’s dark side hint at the bright curved linear streaks, seen by Voyager. These streaks are thought to be deposits of water ice. The image was taken with the Cassini spacecraft narrow angle camera on July 2, 2004, from a distance of about 1.4 million kilometers (860,000 thousand miles) from Dione, at a Sun-Dione-spacecraft, or phase angle of about 119 degrees. The image scale is 8 kilometers (5 miles) per pixel. Dione’s diameter is 1,118 kilometers (695 miles) across. The images have been magnified by a factor of two to aid visibility. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA’s Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo. Ares 1-X PatchThe official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.Apollo CollageThis beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.Expedition 21The official embroidered patch for the International Space Station Expedition 21 crew is now available from our stores.Hubble PatchThe official embroidered patch for mission STS-125, the space shuttle’s last planned service call to the Hubble Space Telescope, is available for purchase. | | | | 2014 Spaceflight Now Inc.Cassini takes picture of departing Huygens probe CASSINI PHOTO RELEASEPosted: December 26, 2004 Credit: NASA/JPLDownload larger image version The Cassini spacecraft snapped this image of the European Space Agency’s Huygens probe about 12 hours after its release from the orbiter. The probe successfully detached from Cassini on Dec. 24, 2004, and is on course for its January 14 encounter with Titan. The Huygens probe will remain dormant until the onboard timer wakes it up just before the probe reaches Titan’s upper atmosphere on Jan. 14, 2005. Then it will begin a dramatic plunge through Titan’s murky atmosphere, tasting its chemical makeup and composition as it descends to touch down on its surface. The data gathered during this 2-1/2 hour descent will be transmitted from the probe to the Cassini orbiter.Afterward, Cassini will point its antenna to Earth and relay the data through NASA’s Deep Space Network to JPL and on to the European Space Agency’s Space Operations Center in Darmstadt, Germany, which serves as the operations center for the Huygens probe mission. From this control center, ESA engineers will be tracking the probe and scientists will be standing by to process the data from the probe’s six instruments. Credit: NASA/JPLDownload larger image version The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA’s Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL.Ares 1-X PatchThe official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.Apollo CollageThis beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.Expedition 21The official embroidered patch for the International Space Station Expedition 21 crew is now available from our stores.Hubble PatchThe official embroidered patch for mission STS-125, the space shuttle’s last planned service call to the Hubble Space Telescope, is available for purchase. | | | | 2014 Spaceflight Now Inc.Cassini spacecraft’s solar conjunction ends CASSINI PHOTO RELEASEPosted: July 12, 2004The Cassini spacecraft emerged from behind the Sun today after being in solar conjunction since July 5. The most recent spacecraft telemetry was acquired from the Deep Space Network’s Goldstone tracking station near Barstow, Calif., today. The spacecraft is in excellent health and operating normally.Just before Cassini began its transit behind the Sun, it snapped pictures of Saturn’s moonsMimas, Tethys, Rhea and Iapetus. These and other new pictures from Saturn can be found as raw images at .Solar conjunction occurs when the Sun is between the spacecraft and Earth. During this time, the spacecraft conducts only limited science observations. Command and downlink capability is reduced to a minimum, with an uplink command file consisting of 10 commands sent every five minutes, 10 to 20 times a day. The purpose of this test is to assess the spaceraft’s ability to receive commands from Earth when the signal path goes so close to the Sun.The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA’s Office of Space Science, Washington, D.C. JPL designed, developed and assembled the Cassini orbiter.Ares 1-X PatchThe official embroidered patch for the Ares 1-X rocket test flight, is available for purchase.Apollo CollageThis beautiful one piece set features the Apollo program emblem surrounded by the individual mission logos.Expedition 21The official embroidered patch for the International Space Station Expedition 21 crew is now available from our stores.Hubble PatchThe official embroidered patch for mission STS-125, the space shuttle’s last planned service call to the Hubble Space Telescope, is available for purchase. | | | | 2014 Spaceflight Now Inc.Cassini spacecraft executes crucial rocket firing BY WILLIAM HARWOOD

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