ACE Weekly 08/14/2012 - 08/20/2012 All ACE spacecraft subsystems are performing as expected. ======================================================================== Orbit/Attitude: Type Attitude SK-62 Date 08/20/2012 08/20/2012 DOY 233 2012 233 2012 Thrusters 2R 4R+ 4R- 3A 4A Duration 19:27 min 49.333 sec Start 14:16:22z 15:45:53z Stop 14:35:49z 15:46:43z HGAStart -8.01deg +7.88deg HGAStop +7.88deg +7.90deg SunStart 10.84deg 5.15deg SunStop 5.15deg 5.13deg SpinStart 5.0664rpm 5.0707rpm SpinStop 5.0707rpm 5.0596rpm Nutation 0.12deg 0.07deg Firing 99 pulses Continuous FuelUsed 0.2951lbs 0.1680lbs FuelRemain 120.1272lbs 119.9592lbs FinalSCMass 1354.387lbs 1354.219lbs The next attitude maneuver is scheduled for Thursday 09/06/2012. ======================================================================== OCRs: None ======================================================================== Activities: Data Capture: 100% DOY 225-232 2012 WS1 had a short test on Monday 8/20/2012. The WS1 Ground Receipt Time still has 2 problems: 1) the time occasionally reads 1/1/2012 0000z and 2) the millisecond field isn't populated. The SSMO review for ACE using the WS1 ground antenna has been scheduled for Friday August 31. ======================================================================== Anomalies: DOY 233 08/20/2012 S-ACE-0648 G12-0010 DSN DCD Problems DSN's Data Capture and Delivery (DCD) system had a manual failover (1647z); this impacted all Goldstone antennas. DSS-24 had further problems when their TLP (Telemetry Processor) failed to reconnect to the DCD after the failover. After 10 minutes (1657z), the station reset the connection. The 10 minutes of data (both realtime and playback) flowed to the MMOC until telemetry was caught up. DR# G113138 & G113139. DCD problems last impacted an ACE pass on 09/21/2011 (S-ACE-0627 G11-0053). IMPACT: Data was delayed by 10 minutes, but was "backfilled" such that there was only a 4 second gap in realtime data and no gap in playback data. NOAA SWPC and ASC occasionally have problems when backfilled data is rapidly sent; however no problems were reported.