ACE Weekly 03/29/2011 - 04/04/2011 All ACE spacecraft subsystems are performing nominally. ======================================================================== Orbit/Attitude: Type Attitude Date 04/04/2011 DOY 094 2011 Thrusters 2R 4R+ 4R- Duration 15:05 min Start 18:22:59z Stop 18:38:04z HGAStart -7.51deg HGAStop +7.59deg SunStart 18.24deg SunStop 5.73deg SpinStart 5.1418rpm SpinStop 5.0746rpm Nutation 0.21deg Firing 77 pulses FuelUsed 0.2411lbs FuelRemain 129.8412lbs FinalSCMass 1364.101lbs The next attitude maneuver is scheduled for Tuesday 04/19/2011. ======================================================================= OCRs: DOY 091 (04/01/2009) 1707-1911z SEP-110 and SEP-111 SEPICA power cycled to recover from Standby Mode (DOY 081, AR#S11-0001). ======================================================================== Activities: Data Capture: 100% DOY 086-093 2011 ======================================================================== Anomalies: DOY 089 03/30/2011 S-ACE-0598 G11-0025 Degraded TLM -- RFI RFI (Radio Frequency Interference) from an Edwards AFB flight affected station DSS-27 reception of ACE telemetry for 22 minutes (17:14:33-17:36:39z). DR#G111287 IMPACT: The data was automatically redumped at the end of the pass DOY 090 03/31/2011 S-ACE-0599 G11-0026 DSN DCD Failure DSN's Data Capture and Delivery system (DCD2) had a failover DR#G111295 IMPACT: 10 minute outage at 2153z. The missing data was backfilled when the DCD system returned to service. NOAA SWPC and ASC don't always process backfilled data. DOY 091 04/01/2011 S-ACE-0592 G11-0020 ITOS tm_controller ITOS was unable to process telemetry due to a "timeout reading from tm_controller". ITOS was restarted before beginning of track. (DR CDSID#00027515) IMPACT: Manual intervention required. ITOS tm_controller problems also occurred at the beginning of 2 WIND passes (DOY 092 00:20z and DOY 094 00:15z). ITOS was restarted before the upcoming ACE passes. DOY 093 04/03/2011 S-ACE-0600 G11-0027 Degraded TLM -- RFI Unknown DSN DSS-27 ground antenna experienced a reduced downlink signal strength. RFI source is unknown. DR#G111304 IMPACT: 13 minutes of reduced telemetry starting at 1732z occurred after the SSR playback had completed. DOY 094 04/04/2011 S-ACE-0601 G11-0028 DSN TLM Problems DSN DSS-27 ground antenna had problems acquiring ACE telemetry possibly due to RFI. Problems continued as the ground station was configured for the wrong downlink bit rate. DR#G111312 & G111313 IMPACT: Activities delayed 20 minutes. DOY 094 04/04/2011 S-ACE-0602 G11-0029 Procedure not resumed The ace_pass procedure was not resumed after the attitude maneuver. IMPACT: SWEPAM calibration and final state-of-health checks will be performed on the following pass.