ACE Weekly 02/22/2011 - 02/28/2011 All ACE spacecraft subsystems are performing nominally. ======================================================================== Orbit/Attitude: Type Attitude SK-57 Date 02/25/2011 02/25/2011 DOY 056 2011 056 2011 Thrusters 2R 4R+ 4R- 3A 4A Duration 15:27 min 75.004 sec Start 16:50:10z 18:35:01z Stop 17:05:37z 18:36:16z HGAStart -6.57deg +7.54deg HGAStop +7.54deg +7.42deg SunStart 9.32deg 7.04deg SunStop 7.04deg 7.08deg SpinStart 5.0808rpm 5.0847rpm SpinStop 5.0847rpm 5.0676rpm Nutation 0.25deg 0.29deg Firing 79 pulses Continuous FuelUsed 0.2464lbs 0.2617lbs FuelRemain 130.5824lbs 130.3208lbs FinalSCMass 1364.842lbs 1364.581lbs The next attitude maneuver is scheduled for Thursday 03/17/2011. ======================================================================= OCRs: None ======================================================================== Activities: Data Capture: 100% DOY 051-058 2011 ======================================================================== Anomalies: DOY 053 02/22/2011 S-ACE-0586 G11-0014 DSS-65 Antenna Brake The ground antenna brake was engaged 11 minutes after Beginning Of Track (BOT). The brakes were released within 3 minutes and tracking resumed. The Antenna Logic Controller module was replaced after the ACE pass. DR#M106172 IMPACT: Minimal. Receiver B lost lock on the uplink, but C&DH B commanding had already completed. DOY 055 02/24/2011 S-ACE-0587 G11-0015 No Telemetry from MUS For unknown reasons, the MMOC SLE software (Multi-User SLE, MUS) was not sending any telemetry to ITOS or ace_data_fwd. This problem last occurred on 1/24/2011 AR#G11-0010. ITOS and MUS were restarted. IMPACT: Activities delayed 15 minutes. Manual intervention required. DOY 055 02/24/2011 S-ACE-0588 G11-0016 DSN IDR Delivery Failed DSN's IDR file delivery has not been successful since 2/23/2011. DSN is investigating. Only the MMOC seems to be affected, ASC has not reported any problems. IMPACT: The MMOC archives the DSN IDR files with the additional data in the 0161 header. Data archiving on hold while the problem is investigated. DOY 058 02/27/2011 S-ACE-0589 G11-0017 DSN DCD Failure DSN's Data Capture and Delivery system (DCD) had a Store1 failure and then a Store2 failure. DR#N107172 IMPACT: 3 minute outage at 15:35z and a 20 minute outage at 15:59z. The missing data was backfilled when the DCD system returned to service. 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