ACE Weekly 04/08/2009 - 04/14/2009 All ACE spacecraft subsystems are performing nominally. ======================================================================== Orbit/Attitude: Type Attitude Date 04/14/2009 DOY 104 2009 Thrusters 2R 4R+ 4R- Duration 15:04 min Start 15:05:16z Stop 15:20:20z HGAStart -7.37deg HGAStop +7.74deg SunStart 15.70deg SunStop 5.72deg SpinStart 5.0042rpm SpinStop 5.0077rpm Nutation 0.08deg Firing 76 pulses FuelUsed 0.2460lbs FuelRemain 143.6800lbs FinalSCMass 1377.940lbs The next attitude maneuver is scheduled for Friday 05/01/2009. ======================================================================= OCRs: None ======================================================================== Activities: Data Capture: 100% DOY 095-102 2009 ======================================================================== Anomalies: DOY 100 04/10/2009 S-ACE-0427 G09-0022 GSFC GMUG Data Problems The GSFC GMUG was intermittently not forwarding ACE real-time telemetry (VC1) to NOAA Space Weather Prediction Center (NOAA SWPC) and to the ACE Science Center starting at Beginning Track (BOT=2015z High-Rate=2021z). The NOAA team notified the ACE FOT at 2200z. The ACE FOT notified Goddard Comm Control. Data started flowing to NOAA including old data going back to 2115z. However, real-time telemetry to the ACE MOC stopped at 2222z. At 2313z, the ACE MOC started receiving garbage data on the VC1 line until the End Of Track at 2345z. The data flow to the ACE MOC was resolved before the next pass on DOY 101. Goddard Comm Control informed the FOT that no changes had been made. Trouble Ticket 27073 IMPACT: CDR data at DSN not impacted. Final state-of-health checks and SSR redumps were performed on the next pass (DOY 101). See AR G09-0023 for the impact due to bad data to the ACE MOC. DOY 100 04/10/2009 S-ACE-0428 G09-0023 Bad Data from GSFC GMUG The GSFC GMUG was forwarding garbage data to the ACE MOC from 2313-2345z (End Of Track). TPOCC did not decommutate the telemetry but did save bad time values used for Clock Calibration. IMPACT: The FOT tools discarded the bad clock calibration and the reports for DOY 100 and DOY 101 were sent on Monday DOY 103. It is fortunate that TPOCC did not decommutate the garbage data. The automated procedures could have resulted in early termination of the playback (data loss) or not returning the spacecraft to a nominal state during final state-of-health checks.