ACE Weekly 09/16/05 - 09/22/05 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: Type Attitude Attitude Date 09/16/05 09/16/05 DOY 259 2005 259 2005 Thrusters 2R 4R+ 4R- 2R 4R+ 4R- Duration 6:09 min 7:05 min Start Time 16:49:26z 17:53:06z Stop Time 16:55:35z 18:00:11z Firing 32 pulses 36 pulses The next attitude maneuver and station keeping maneuver #37 are scheduled for Wednesday 09/28/05. ============================================================================ OCRs: DOY 264 (09/21/05) 1603-1609z SWPX-040 SWEPAM-E CEM High Voltage increased from level 14 to level 15 in order to compensate for sensor gain losses due to aging affects. DOY 264 (09/21/05) 1623-1632z SC-05-003 C&DH Block and Autonomy Bins for RF antenna switching have been updated. This included updating the bin for recovery of Rcvr B on +Z (e.g. from a C&DH B RF Watchdog #1) and consolidating bins with duplicate actions. ============================================================================ Ongoing Activities: Space Link Extension (SLE) - The next DSN/Developer test with DTF-21 is scheduled for Wednesday 10/05/05 at 1600-2015z. The next telecon is scheduled for Thursday 10/06/05 at 1800z. RIONet - The target date for transferring string 3 to the Restricted IONet has been tentatively set for Monday 10/17/05. ============================================================================ Extra Activities: DOY 262 (09/19/05) 1700-1800z No impact to operations from JPL circuit release to cut circuits over to a T-1 patch panel at CTT and only one T-1 line available for Closed IONet. DOY 265 (09/22/05) 1915-2200z FOT supported DSS-16 troubleshooting of CMD Mod Index problems after the scheduled support. The station engineer reset and recalibrated the equipment for successful operation, but no root cause was determined. No commands were transmitted to the spacecraft during these tests (water load). ============================================================================ Anomalies: DOY 259 (09/16/05) G05-0120 GDS DSS-16 CMD Mod Index Incorrect CMD Mod Index (0.39dB instead of correct value of 1.69dB) prevented the spacecraft from seeing commands. Station manually re-entered value and commands were successful. DR# G106071 IMPACT: Activities delayed 8 minutes DOY 263 (09/20/05) G05-0121 GDS DSS-16 Transmitter Failure Ops Chief informed FOT that DSS-16 was red and unavailable for the scheduled support. The Ops Chief acquired another support with DSS-27 and updated the DSN schedule in time for ROBOTT to download the new pass times. DR# G106083 IMPACT: No sequential ranging with DSS-27 DOY 265 (09/22/05) G05-0122 GDS DSS-16 CMD Mod Index Incorrect CMD Mod Index (0.41dB instead of correct value of 1.69dB) prevented the spacecraft from seeing commands. Station manually re-entered value and commands were successful. DR# G106094 IMPACT: Activities delayed 14 minutes DOY 265 (09/22/05) G05-0123 GDS DSS-16 Ranging Correlation Alarms Station received constant SRA (Sequential Ranging Assembly) bad correlation alarms during the support from their equipment. FDF has been notified that the range data may be invalid. DR# G106095 IMPACT: Ranging data