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LCROSS
The Lunar Crater Observation and Sensing Satellite (LCROSS) is a robotic spacecraft operated by NASA, which is currently orbiting the Earth and is targeted for impact on the Moon early October 2009.[2] LCROSS is designed to watch as the launch vehicle's spent Centaur upper stage, with a nominal impact mass of 2,305 kg (5,081 lb), strikes the Cabeus crater[3] near the south pole of the Moon (projected impact at the lunar South Pole is currently: Oct 9, 2009 at 11:31:30 UTC). LCROSS was launched on June 18, 2009, together with the Lunar Reconnaissance Orbiter as part of the shared Lunar Precursor Robotic Program, the first American mission to the Moon in over ten years. Together, LCROSS and LRO form the vanguard of NASA's return to the Moon.[4]
Early in the morning on August 22, 2009, LCROSS ground controllers discovered an anomaly due to a sensor issue, the spacecraft burned through 309 pounds of fuel, resulting in more than half of remaining fuel at the time burned up. According to Dan Andrews, the LCROSS project manager, "Our estimates now are if we pretty much baseline the mission, meaning just accomplish the things that we have to (do) to get the job done with full mission success, we're still in the black on propellant, but not by a lot."[5]
http://en.wikipedia.org/wiki/LCROSS
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