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This reporting period (26 August to 16 September 2005) covers three weeks of passive cruise, with no major activities planned and weekly ground contact with the spacecraft. Apart for routine monitoring activities and the upload of a software patch to the Star Tracker B (on 8 September), a major unexpected event was a solar flare on 8 and 9 September, which hit the spacecraft at the beginning of the weekly non-coverage period. When the signal was acquired for the weekly contact on 15 September the spacecraft was found with the active Star Tracker crashed in INIT mode, and the second Star Tracker (not used for attitude control) in Standby mode. AOCS had determined the attitude over a period of 6 days using gyroscopes only, and accumulated therefore a drift of about 0.7 degrees, of which 0.3 degrees offset in the High Gain Antenna pointing direction, small enough to allow the RF signal to be received on ground. The recovery activities took most of the ground station pass on 15 September. At the end both Star Trackers were back in Tracking mode and the nominal attitude reacquired. No payload operations were carried out in the reporting period, and all instruments are switched off, except for SREM which is kept active in the background for radiation monitoring. A total of 3 New Norcia passes of maximum 10 hours commanding duration were taken over the reporting period. Related Links SpaceDaily Search SpaceDaily Subscribe To SpaceDaily Express 
Earth And Moon Through Rosetta's Eyes
Paris (ESA) May 04, 2005ESA's comet chaser mission Rosetta took these infrared and visible images of Earth and the Moon, during the Earth fly-by of 4/5 March 2005 while on its way to Comet 67P/Churyumov-Gerasimenko. |
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