Mission Status 2010
Tim Larson Stardust Spacecraft Team
May 4, 2010
The spacecraft is in cruise mode, with all equipment operating nominally on Side A of the spacecraft. On Monday, 5/03/10, a the spacecraft was commanded to swap to Side B. After a 22 minute delay beyond the planned Acquisition of Signal, the signal from the spacecraft was detected and the telemetry stream showed that the spacecraft had swapped back and forth between Side B and A four times, finally ending on Side A after reaching the swap limit in Fault Protection software. Subsequent investigation indicates that this behavior is due to the order and timing of commands issued by the software executive and the safing sequence. This results in thruster commands being send to the propulsion valve driver module board before it was commanded to a state that enabled it to receive them. The data analysis continues, and the spacecraft test bed will be modified to test the postulated condition. Once the appropriate correction to this issue is identified and validated, the on board safe mode sequence will be updated to correct this problem. The spacecraft exited safe mode and was returned to normal cruise mode on 5/04/10.
April 28, 2010
The spacecraft is nominal and in cruise mode. The CRC checks, memory dumps, and diagnostics on Side A are being run this week in preparation for the swap to Side B on May 3. All the side swap sequences and contingency commands have been tested and reviewed by the team, and a preparatory walk-through of the activity was completed on 5/28.
April 21, 2010
The spacecraft is nominal and in cruise mode. Testing of the sequences used for the May 3 side swap is under way. The nominal cases will be completed this week, and the faulted cases will be completed next week.
April 14, 2010
The spacecraft is nominal and in cruise mode. The team is testing the products to be used for the spacecraft side swap. The test results will be reviewed early next week, and if successful, will be approved in anticipation of the swap planned for May 3. The final preparations and diagnostics for Side A prior to the swap are planned for April 26.
April 7, 2010
The spacecraft is operating normally in cruise mode. The daily diagnostics show that the nucleus tracking patch written to EEPROM on side A has been successful.
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