ACE Weekly 11/16/2011 - 11/21/2011 All ACE spacecraft subsystems are performing as expected. ======================================================================== Orbit/Attitude: Type Attitude Date 11/21/2011 DOY 325 2011 Thrusters 2R 4R+ 4R- Duration 16:22 min Start 20:43:54z Stop 21:00:16z HGAStart -7.09deg HGAStop +7.67deg SunStart 5.23deg SunStop 10.78deg SpinStart 5.0372rpm SpinStop 5.0416rpm Nutation 0.07deg Firing 83 pulses FuelUsed 0.2597lbs FuelRemain 125.3804lbs FinalSCMass 1359.640lbs The next attitude maneuver is scheduled for Friday 12/02/2011. ======================================================================= OCRs: Update on MOCR 371 - 4 degree sun constraint The sun angle was below 4 degrees from DOY 319 0001z to DOY 324 0644z. The sun angle reached a minimum of 3.1 degrees around DOY 321 1400z. There were no problems with sun pulse generation. ======================================================================== Activities: Data Capture: 99.99% DOY 320-324 2011 DOY 320 07:09:57-07:10:27 31 seconds during SSR failover ======================================================================== Anomalies: DOY 323 11/19/2011 S-ACE-0523 S10-0007 Increase in SBE_CT_B SSR B Single Bit Error Count (SBE_CT_B) increased from 10662 to 10995 since last checked on DOY 315 (11/11/2011). SBE_CT is tracked as a measure of SSR health. IMPACT: Minimal. Single Bit Errors are automatically corrected by the SSR. No non-correctable errors (Hard Single Bit Errors & Double Bit Errors) have occurred throughout the mission. SBE_CT_A SBE_CT_B 1999 15 2000 2001 2002 2003 270 286 2004 858 2005 2006 2118 2007 510 3238 2008 4533 2009 525 6839 2010 780 7339 2011 10995 DOY 325 11/21/2011 S-ACE-0634 G11-0060 Empty DSN Schedule The MMOC tool "dsn_sched_cron" checks the DSN schedule every 20 minutes; at 17, 37 and 57 minutes past the hour. At 1817z, the DSN week 47 schedule was empty when downloaded. At 1837z, version 140 of the DSN week 47 schedule was downloaded and the schedule was repopulated. IMPACT: The ace_pass.proc was scheduled to start at 1820z. Manual intervention required to start the procedure.