ACE Weekly 04/14/2010 - 04/20/2010 All ACE spacecraft subsystems are performing nominally. ======================================================================== Orbit/Attitude: Type Attitude Date 04/16/2010 DOY 106 2010 Thrusters 2R 4R+ 4R- Duration 13:09 min Start 12:56:58z Stop 13:10:07z HGAStart -5.75deg HGAStop 7.64deg SunStart 16.16deg SunStop 5.73deg SpinStart 5.0542rpm SpinStop 5.0570rpm Nutation 0.20deg Firing 67 pulses FuelUsed 0.2130lbs FuelRemain 137.0404lbs FinalSCMass 1371.300lbs The next attitude maneuver is scheduled for Friday 04/30/2010. ======================================================================= OCRs: None ======================================================================== Activities: DOY 105 04/15/2010 - DSS-34 Return To Service Demo DSS-34 is returning to service after an Azimuth Track Replacement (1/27/2010-04/21/2010). The Demo was taken as an unattended regular pass. No problems were uncovered during the Demo. Data Capture: 100% DOY 101-108 2010 ======================================================================== Anomalies: NOTE, WIND anomaly reports will be included when problems with MMOC software/equipment would have impacted ACE operations. DOY 105 04/15/2010 S-WIND-0413 ITOS tm_controller Before Beginning Of Track, ITOS had problems connecting telemetry, "timeout reading from tm_controller". ITOS was stopped and restarted and the WIND pass was taken successfully. This problem occurs approximately once every 2 weeks. DR CDSID#00027515 has been submitted for ITOS developers. IMPACT: Manual intervention required. DOY 109 04/19/2010 S-ACE-0498 G10-0021 NOAA/USAF TLM problems NOAA Space Weather Prediction Center (SWPC) called the FOT and informed that the USAF was unable to process telemetry from the ACE spacecraft after the pass with DSS-24 had ended (DOY 109 0020z). The FOT went to MMOC and found no problems with the previous pass. The FOT requested time with DSS-45 (available 0230-0325z) to verify that the spacecraft was ok. DSS-45 provided telemetry from 0256-0315z. There were no problems with the spacecraft. DLR/Germany was able to track the spacecraft for NOAA starting at ~0430z (DOY 109). IMPACT: Given the downlink format problem on 11/24/2009 (AR#S09-0009), the FOT followed prudence and checked the spacecraft after receiving the call from NOAA.