NASA Dawn asteroid mission told to ‘stand down’ |
NASA Dawn asteroid mission told to ‘stand down’ |
Nov 7 2005, 03:55 PM
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Member Group: Members Posts: 370 Joined: 12-September 05 From: France Member No.: 495 |
NASA Dawn Asteroid Mission Told To ‘Stand Down’ .
The decision to stand down, according to SPACE.com sources, appears related to budget-related measures and workforce cutbacks at the Jet Propulsion Laboratory (JPL) in Pasadena, California. http://www.space.com/missionlaunches/051107_dawn_qown.html Rakhir |
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Nov 22 2005, 01:31 AM
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
New updates about the DAWN's proyect:
NASA Dawn Mission Status November 2005 In mid-October, the Dawn mission team was asked by NASA Headquarters to cease all work except that which was critical to maintaining the viability of the Dawn mission to launch on a delayed schedule, still achieving all of its scientific objectives. This action was taken in response to concerns about the availability of funding in FY2006 to cover any problems that might arise during environmental and performance testing, particularly with regard to several pieces of subsystem hardware perceived to have experienced significant problems. There are three items of concern: 1) The Power Processing Units (PPUs) that provide the high voltage power to the thrusters in the ion propulsion system. Not yet has started the test. It would be during on November and December 2005. 2) One of the redundant Attitude Control Electronics (ACE) boxes. Item above. 3) The xenon tank. --> Its solution might be by reducing its capacity of xenon fuel load from 450 to 425 kg to increase the safety margin. Because of the flexibility afforded by the ion propulsion, Dawn's launch period extends at least into late 2007. The original launch period in June 2006 was chosen based on projected readiness to launch at that time. The baseline trajectory includes a Mars Gravity Assist in 2009, which fixes the timing of subsequent events. More details: http://www.spaceref.com/news/viewsr.html?pid=18748 Rodolfo |
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