ACE Weekly 05/14/2008 - 05/20/2008 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: Type Attitude SK-48 Date 05/20/2008 05/20/2008 DOY 141 2008 141 2008 Thrusters 2R 4R+ 4R- 3A 4A Duration 14:27 min 54.169 sec Start 16:59:05z 18:46:33z Stop 17:13:32z 18:47:27z HGAStart -6.30deg +7.65deg HGAStop +7.65deg +7.60deg SunStart 15.29deg 4.94deg SunStop 4.94deg 5.00deg Nutation 0.22deg 0.30deg Firing 74 pulses Continuous FuelUsed 0.2369lbs 0.1948lbs FuelRemain 150.1156lbs 149.9208lbs FinalSCMass 1384.375lbs 1384.180lbs The next attitude maneuver is scheduled for Monday 06/02/2008. =========================================================================== OCRs: None ============================================================================ Activities: JPL will not be fixing the ISO router problem until after the Phoenix mission Entry Decent Landing (EDL) on May 25. JPL Comm is aware of the problem and monitoring the router until then. ============================================================================ Anomalies: DOY 138 05/17/2008 S-ACE-0320 G08-0058 DSS-27 Antenna Brake The ground antenna stopped unexpectedly at 2023z. Tracking was resumed at 2035z. Uplink was resumed at 2038z. DR#G108614 IMPACT: 15 minute telemetry outage was redumped later. No commanding was needed during this period. DOY 138 05/17/2008 S-ACE-0321 G08-0059 ROBOTT/C&C Failed to Resume The MOC automation software failed to resume after DSS-27 antenna returned to service. This last occurred DOY 093 2008 (AR#G08-0038). IMPACT: Final state-of-health checks were not performed. Redumps were performed on the following day. DOY 141 05/20/2008 S-ACE-0321 G08-0060 ROBOTT/C&C Reboot C&C is designed to reboot any time the following event message occurs "TSTOL (ACE) processor, TSTOL_#####, terminating". The RTADS Display was started with a connection to the TSTOL processor. When RTADS Display was terminated, C&C started the reboot process. The C&C reboot was unnecessary and was halted by the FOT. IMPACT: Minimal. A C&C reboot would have delayed the maneuver by 15 minutes.