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<title>LRO-LCROSS Blog Update</title>
<link>http://www.nasa.gov/lro</link>
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<title><![CDATA[Launch Blog Wrapping Up After Successful Launch]]></title>
<description><![CDATA[NASA's Lunar Reconnaissance Orbiter and Lunar Crater Observation and Sensing Satellite missions are flying to the moon after waiting out a thunderstorm before lifting off from Cape Canaveral Air Force  Station in Florida. They rode atop an Atlas V rocket to begin NASA's first lunar mission in 10 years. The LRO spacecraft is flying on its own now, and is on a path to go into orbit only 31 miles above the moon. The LCROSS spacecraft is shepherding the Centaur  upper stage from the Atlas V on a different course that will allow the spacecraft and empty stage to collide with a shadowed crater near the moon's south pole in October in a search for proof of water. Thanks for joining NASA's Launch Blog for the start of this exciting mission. Join us for the next launch, and check back with NASA's Web site to track the progress of the LRO and LCROSS spacecraft.]]></description>
<pubDate>Thu, 18 Jun 2009 22:38:04 GMT</pubDate>
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<title><![CDATA[Launch Team Excited by Liftoff]]></title>
<description><![CDATA[&quot;All is well so far,&quot; NASA Launch Manager Chuck Dovale said about the launch of the Atlas V rocket sending a pair of robotic probes to the moon.  The countdown held no technical surprises for the NASA and United Launch Alliance launch teams, but a stubborn storm near Launch Complex 41 at Cape Canaveral Air Force Station threatened to hold up the liftoff. Managers  quickly reset their schedules for a launch at 5:32 p.m., 20 minutes after the first opportunity. Dovale said the team knew it had to act fast to make the schedule. &quot;If we hesitated on a decision, we possibly could lose the one good opportunity we would have,&quot; Dovale said.]]></description>
<pubDate>Thu, 18 Jun 2009 22:28:44 GMT</pubDate>
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<title><![CDATA[LRO on its own]]></title>
<description><![CDATA[The Lunar Reconnaissance Orbiter has separated from the Centaur upper stage and LCROSS spacecraft.]]></description>
<pubDate>Thu, 18 Jun 2009 22:17:13 GMT</pubDate>
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<title><![CDATA[Centaur Shuts Down]]></title>
<description><![CDATA[The Centaur's single engine has shut off as planned and the LRO and LCROSS spacecraft are coasting toward the moon. The LRO spacecraft will separate in about two minutes and follow its own course that  will let it reach the moon in four days. The LCROSS spacecraft will stay connected to the Centaur upper stage and they will go into a long orbit around the moon and Earth that will culminate in their planned collision into the lunar south pole.]]></description>
<pubDate>Thu, 18 Jun 2009 22:14:18 GMT</pubDate>
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<title><![CDATA[Centaur Ignites Engine Second Time]]></title>
<description><![CDATA[The Centaur upper stage lit its engine for a second time to catapult the LRO and LCROSS spacecraft toward the moon. The burn will last five minutes. The rocket is over the Indian Ocean.]]></description>
<pubDate>Thu, 18 Jun 2009 22:09:14 GMT</pubDate>
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<title><![CDATA[Centaur Engine Shuts Down as Planned]]></title>
<description><![CDATA[The single engine on the Centaur upper stage shut down as planned. It will restart later to put the LRO and LCROSS spacecraft on a trajectory toward the moon. The LRO will separate soon after the end  of the second burn since it will follow a different path to the moon than the LCROSS and Centaur will take.]]></description>
<pubDate>Thu, 18 Jun 2009 21:46:24 GMT</pubDate>
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<title><![CDATA[Centaur Firing]]></title>
<description><![CDATA[The Centaur upper stage is firing to push the LRO and LCROSS spacecraft higher and faster. The rocket is going 12,422 mph and climbing. It is 800 miles away from Cape Canaveral Air Force Station.]]></description>
<pubDate>Thu, 18 Jun 2009 21:46:04 GMT</pubDate>
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<title><![CDATA[First Stage Booster Separation]]></title>
<description><![CDATA[The first stage of the Atlas V rocket has burned out and fallen away from the Centaur upper stage and the two moon-bound spacecraft.]]></description>
<pubDate>Thu, 18 Jun 2009 21:38:19 GMT</pubDate>
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<title><![CDATA[Payload Fairing Separates]]></title>
<description><![CDATA[The payload fairing that protected the LRO and LCROSS spacecraft has fallen away from the rocket as planned.]]></description>
<pubDate>Thu, 18 Jun 2009 21:38:07 GMT</pubDate>
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<title><![CDATA[Atlas Flies Strong]]></title>
<description><![CDATA[The Atlas V rocket is gaining speed at altitude onthe strength of its RD-180 engine. It has just crossed the sound barrier and the region of maximum dynamic pressure. All systems working well. 11.3  miles high.]]></description>
<pubDate>Thu, 18 Jun 2009 21:34:17 GMT</pubDate>
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<title><![CDATA[LIFTOFF!]]></title>
<description><![CDATA[Liftoff of NASA's newest lunar explorers!]]></description>
<pubDate>Thu, 18 Jun 2009 21:32:33 GMT</pubDate>
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<title><![CDATA[Atlas, Centaur on Internal Power]]></title>
<description><![CDATA[The Atlas V booster and its Centaur upper stage are both operating on internal power. Two minutes to go.]]></description>
<pubDate>Thu, 18 Jun 2009 21:30:16 GMT</pubDate>
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<title><![CDATA[Countdown Resumes]]></title>
<description><![CDATA[The clock is moving backwards again from the T-4 minute point. Launch time is 5:32 p.m.]]></description>
<pubDate>Thu, 18 Jun 2009 21:28:14 GMT</pubDate>
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<title><![CDATA[Launch Teams "Go" for Liftoff]]></title>
<description><![CDATA[Working no technical issues and with the weather cleared over the launch site, NASA and United Launch Alliance controllers have declared themselves and the Atlas V rocket ready for liftoff at 5:32  p.m. The two spacecraft aboard, the LRO and LCROSS, are also ready for their missions to the moon.]]></description>
<pubDate>Thu, 18 Jun 2009 21:26:31 GMT</pubDate>
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<title><![CDATA[Launch Polls on Deck]]></title>
<description><![CDATA[The launch teams are preparing to conduct the final launch polls for a 5:32 p.m. liftoff of the LRO and LCROSS missions on an Atlas V rocket.]]></description>
<pubDate>Thu, 18 Jun 2009 21:18:56 GMT</pubDate>
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<title><![CDATA[Range is "Go"]]></title>
<description><![CDATA[The weather is cleared and Air Force has declared the Eastern Range is &quot;go&quot; for launch.]]></description>
<pubDate>Thu, 18 Jun 2009 21:17:43 GMT</pubDate>
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<title><![CDATA[Spacecraft are on Internal Power]]></title>
<description><![CDATA[Both the LRO and LCROSS spacecraft are running on their own power. Once in space, they will use solar panels to convert sunlight into electricity.]]></description>
<pubDate>Thu, 18 Jun 2009 21:15:30 GMT</pubDate>
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<title><![CDATA[Clearing Weather Forecast]]></title>
<description><![CDATA[The weather is now expected to clear in 10 minutes, leaving the Atlas V launch team with good conditions for launch.]]></description>
<pubDate>Thu, 18 Jun 2009 21:11:43 GMT</pubDate>
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<title><![CDATA[Launch Team Draws Up Weather Strategy]]></title>
<description><![CDATA[The Launch Services Program and United Launch Alliance teams are considering the best course of action for dealing with weather conditions that currently violate launch rules. The countdown clock could  still be restarted from its T-4 minute hold and run down to T-60 seconds even if the weather is &quot;no go.&quot; The launch opportunity at 5:32 is instantaneous, so if they can't make that, they will have to reset for tomorrow.]]></description>
<pubDate>Thu, 18 Jun 2009 21:08:36 GMT</pubDate>
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<title><![CDATA[Launch Time Resets for 5:32 p.m.]]></title>
<description><![CDATA[The Atlas V launch team is aiming for the 5:32 p.m. opportunity to give the current weather conditions a chance to move away.]]></description>
<pubDate>Thu, 18 Jun 2009 20:59:11 GMT</pubDate>
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<title><![CDATA[Countdown in Planned Hold]]></title>
<description><![CDATA[The countdown for the launch of an Atlas V rocket with two lunar probes onboard has entered its last planned hold. The clocks have paused at the T-4 minute point and are to restart in 20 minutes. Weather  remains the only concern for the launch. Launch time is 5:12 p.m. with two more chances at 5:22 p.m. and 5:32 p.m.]]></description>
<pubDate>Thu, 18 Jun 2009 20:52:01 GMT</pubDate>
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<title><![CDATA[Launch Team Considering Options]]></title>
<description><![CDATA[Vernon Thorp with the United Launch Alliance told NASA TV the launch team will decide during the built-in hold in 10 minutes whether to push ahead to the first launch opportunity today or try instead  for one of the later chances. The concern is a nearby storm system and the range is currently &quot;no-go&quot; for lightning and anvil clouds.]]></description>
<pubDate>Thu, 18 Jun 2009 20:41:05 GMT</pubDate>
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<title><![CDATA[The Prospect of Lunar Ice]]></title>
<description><![CDATA[One of the reasons the LCROSS mission was selected for this flight was the tantalizing results from the Lunar Prospector spacecraft that was launched in 1998. That satellite found signs of water or  hydrogen in the areas near the moon's poles. That was enough to raise curiosity. Both LRO and LCROSS were loaded with instruments that will search for water during their missions. For moon-bound astronauts, the lunar water could be used for fuel and air.]]></description>
<pubDate>Thu, 18 Jun 2009 20:34:39 GMT</pubDate>
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<title><![CDATA[Atlas and Centaur Fueled]]></title>
<description><![CDATA[The fuel and oxygen tanks of the Atlas and its Centaur upper stage are at flight levels now and the launch pad systems are pumping in small amounts of liquid oxygen and liquid hydrogen to replace the  amounts that boil off.  As for the weather, forecasters continue to track the storm cell near the Atlas launch complex. Launch preparations are continuing toward the first launch opportunity at 5:12 p.m.]]></description>
<pubDate>Thu, 18 Jun 2009 20:17:55 GMT</pubDate>
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<title><![CDATA[Launch Weather Conditions "No-Go" Now]]></title>
<description><![CDATA[With storms over NASA's Kennedy Space Center moving south, the launch weather is &quot;no-go&quot; because of lightning and anvil clouds. The countdown is continuing, however, since the storms may pass before  the launch opportunities arrive. The first chance is at 5:12 p.m. Other opportunities are 5:22 p.m. and 5:32 p.m.]]></description>
<pubDate>Thu, 18 Jun 2009 20:09:31 GMT</pubDate>
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<title><![CDATA[Centaur Liquid Hydrogen Tanking Begins]]></title>
<description><![CDATA[Centaur liquid hydrogen chilldown is finished and the propellant is beginning to flow into the rocket's upper stage. By keeping the hydrogen and oxygen in a liquid slush form,  engineers can store more of the fuel onboard the rocket than if they kept it as a gas. That means the rocket engines can burn longer.]]></description>
<pubDate>Thu, 18 Jun 2009 20:00:33 GMT</pubDate>
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<title><![CDATA[Weather Concern Continues]]></title>
<description><![CDATA[Meteorologists are studying the approach of a storm system now in the Daytona area in case it gets close enough to Launch Complex 41 to violate launch conditions. Even if it does, today's launch opportunities  could give the launch team enough time to send the Atlas V on its way after the storm passes. The launch times for today are 5:12 p.m., 5:22 p.m. and 5:32 p.m. Meanwhile, engineers are getting ready to load liquid hydrogen into the Centaur upper stage. Frost is forming on the outside of the Atlas first stage as the liquid oxygen is pumped inside, giving the copper-colored  first stage a white look.]]></description>
<pubDate>Thu, 18 Jun 2009 19:45:13 GMT</pubDate>
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<title><![CDATA[Centaur Oxygen Tank Filled]]></title>
<description><![CDATA[The Centaur's liquid oxygen tank is at flight level. The launch team will start the Centaur liquid hydrogen tanking operations in a few minutes. Since  liquid hydrogen also is a cryogenic propellant, those activities start with chilldown of the appropriate transfer lines.   <br/><br/> Even after the tanks are filled, the propellants will continue to be slowly pumped in to replace the propellant that evaporates during the count, a process known as &quot;topping off.&quot; Like the space shuttle, the  Atlas launch pad is equipped with lines that funnel evaporating propellants away from the rocket until liftoff.]]></description>
<pubDate>Thu, 18 Jun 2009 19:39:07 GMT</pubDate>
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<title><![CDATA[Storm Expected in Area]]></title>
<description><![CDATA[Launch weather officers expect a nearby thunderstorm to enter the area around Launch Complex 41 shortly and last about an hour. The poor weather would potentially violate launch conditions. However,  the tanking operations continue on schedule right now.]]></description>
<pubDate>Thu, 18 Jun 2009 19:30:28 GMT</pubDate>
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<title><![CDATA[Atlas Liquid Oxygen Tanking Begins]]></title>
<description><![CDATA[Liquid oxygen is flowing into the Atlas V booster. The RP-1 fuel the Atlas V engine burns has already been loaded into the rocket's first stage. The engine mixes the refined  kerosene and oxygen to power the rocket with about 860,000 pounds of thrust. The powerful first stage will fire for more than four minutes before it drops away and the Centaur takes over.]]></description>
<pubDate>Thu, 18 Jun 2009 19:30:22 GMT</pubDate>
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<title><![CDATA[LCROSS, Centaur Will Join List of Lunar Impactors]]></title>
<description><![CDATA[Although the LCROSS mission is unusual because it calls for the spacecraft and rocket stage to crash into the surface on purpose, the mission is not the first with that goal. NASA's Ranger 7 spacecraft  plunged to the lunar surface in 1964, sending back the first close-up television images of the moon as it closed in. Nor is Centaur the first rocket stage to be used in a scientific impact. Scientists on Earth measured the &quot;moonquakes&quot; that resulted from the  impacts of the Saturn V third stages into the moon during the Apollo missions. The Soviet Union also launched missions that impacted the moon. The first was the Luna 2 flight in 1959.]]></description>
<pubDate>Thu, 18 Jun 2009 19:19:29 GMT</pubDate>
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<title><![CDATA[Liquid Oxygen Flowing into Centaur]]></title>
<description><![CDATA[Tanking preparations are complete and the team is monitoring the flow of liquid oxygen into the Centaur upper stage. The oxygen that is not used by the engine during launch  will be vented into space before the Centaur collides with the moon. That also goes for the hydrogen fuel the Centaur uses.<br/><br/> The launch team is not working any technical issues now and the weather forecast remains 60 percent favorable for liftoff.]]></description>
<pubDate>Thu, 18 Jun 2009 19:12:14 GMT</pubDate>
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<title><![CDATA[Centaur Transfer Line Chilldown Under Way]]></title>
<description><![CDATA[The transfer lines that deliver liquid oxygen to the 41.5-foot-long Centaur upper stage are being chilled in advance of tanking. This thermal conditioning is called &quot;chilldown&quot;  and aims to reduce stress on the hardware due to an extreme change in temperature. Liquid oxygen is -297 degrees. The liquid hydrogen that will fuel the Centaur is even colder: -423 degrees.]]></description>
<pubDate>Thu, 18 Jun 2009 18:59:37 GMT</pubDate>
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<title><![CDATA[Countdown Resumes]]></title>
<description><![CDATA[The countdown has resumed and clocks are ticking back from the T-120 minute mark. There's only one more scheduled hold in today's countdown, and that one comes much closer  to launch time, at T-4 minutes.   <br/><br/> The launch team is taking steps to prepare the Centaur liquid oxygen storage tank, Atlas liquid oxygen vault and mobile launcher platform supporting the Atlas for the extremely  cold propellants that will begin flowing shortly.]]></description>
<pubDate>Thu, 18 Jun 2009 18:52:08 GMT</pubDate>
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<title><![CDATA[Launch Officials Give "Go" for Cryogenic Tanking]]></title>
<description><![CDATA[Launch  Conductor Ed Christiansen, NASA Launch Manager Chuck Dovale and NASA Advisory Manager Joe Lackovich just polled their respective teams and gave the go-ahead to begin loading super-cold, or &quot;cryogenic,&quot; liquid oxygen and liquid hydrogen into the vehicle.]]></description>
<pubDate>Thu, 18 Jun 2009 18:49:08 GMT</pubDate>
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<title><![CDATA[From the Mission Director's Center]]></title>
<description><![CDATA[Today's edition of the NASA Launch Blog is originating from the Mission Director's Center inside Hangar AE at Cape Canaveral Air Force Station in Florida. We are a couple miles from Launch Complex  41 where the Atlas V stands ready to send the LRO and LCROSS spacecraft to the moon.  The Air Force station is adjacent to NASA's Kennedy Space Center on Florida's Atlantic coast. NASA's Launch Services Program uses the base to launch uncrewed missions. In fact, America's first astronauts  launched from complexes on the Air Force station in the 1960s. The Saturn V and space shuttle missions have all launched from Kennedy, though.]]></description>
<pubDate>Thu, 18 Jun 2009 18:39:57 GMT</pubDate>
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<title><![CDATA[Atlas V Propulsion]]></title>
<description><![CDATA[The countdown has entered a planned hold at the T-120 minute point. The hold is to continue for 30 minutes.  Looking at the bottom of the Atlas V rocket, you'd think it uses two engines. In fact, the Atlas V first stage is powered by a single engine called the RD-180. The single engine feeds propellant into  two thrust chambers where the chemicals are mixed and ignited. The flame and smoke emerges from two nozzles at the bottom of the rocket to shoot it into space. The Atlas V uses highly refined kerosene and cryogenic liquid oxygen for its propellants. The Centaur  upper stage uses a single engine for this mission.]]></description>
<pubDate>Thu, 18 Jun 2009 18:23:28 GMT</pubDate>
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<title><![CDATA[Two Missions on One Rocket]]></title>
<description><![CDATA[The Atlas V rocket standing on Launch Complex 41 here at Cape Canaveral Air Force Station, Fla., will launch both the Lunar Reconnaissance Orbiter  and Lunar Crater Observation and Sensing Satellite missions. A single-engine Centaur is the second or upper stage of the rocket. Unlike most missions, the Centaur will remain with the LCROSS spacecraft after launch to become part of the mission. <br/><br/> Each spacecraft will evaluate the lunar surface in unique ways. The LRO will go into orbit just 31 miles above the lunar surface. Using seven  instruments, it will take high-resolution photos of the moon along with detailed readings of temperatures, radiation and other factors NASA needs to know when deciding where to send astronauts on future missions. <br/><br/> The LCROSS mission will search for water by guiding the empty Centaur upper stage into a permanently shadowed crater near the moon's south pole.  The LCROSS will fly through the plume so its instruments can analyze the dust and elements before it collides with the moon itself.]]></description>
<pubDate>Thu, 18 Jun 2009 18:12:16 GMT</pubDate>
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<title><![CDATA[Atlas V, Two Lunar Spacecraft Poised for Launch]]></title>
<description><![CDATA[NASA is ready to return to the moon for the first time in 10 years and we are at Cape Canaveral Air Force Station to bring you all the developments as the countdown proceeds to today's launch. The  space agency is launching two lunar probes on an Atlas V rocket, the Lunar Reconnaissance Orbiter and the Lunar Crater Observation and Sensing Satellite.    The launch team has three opportunities today for liftoff. The first is 5:12 p.m., then 5:22 p.m. and 5:32 p.m. There are no significant technical issues at this moment, but weather may become a concern. The forecast calls for a 60 percent chance of acceptable conditions at launch time.]]></description>
<pubDate>Thu, 18 Jun 2009 18:03:24 GMT</pubDate>
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<title><![CDATA[Join Us For Launch Coverage at 2 p.m.]]></title>
<description><![CDATA[NASA's Launch Blog will begin coverage of the Lunar Reconnaissance Orbiter and Lunar Crater Observation and Sensing Satellite missions at 2 p.m. The spacecraft will launch together aboard an Atlas  V from Cape Canaveral Air Force Station in Florida. There are three launch opportunities today, starting at 5:12 p.m. NASA's Launch Services Program team is aiming for the first chance. Today's other opportunities are at 5:22 p.m. and 5:32 p.m.]]></description>
<pubDate>Thu, 18 Jun 2009 17:22:52 GMT</pubDate>
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<title><![CDATA[Follow the Launch Blog]]></title>
<description><![CDATA[Join us on launch day for the countdown to liftoff of the Atlas V rocket carrying NASA's Lunar Reconnaissance Orbiter and Lunar Crater Observation and Sensing Satellite.]]></description>
<pubDate>Tue, 09 Jun 2009 14:47:51 GMT</pubDate>
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