ACE Weekly 11/16/2011 - 11/21/2011

All ACE spacecraft subsystems are performing as expected.

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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.

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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.


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Activities:

Data Capture:  99.99%  DOY 320-324 2011
DOY 320 07:09:57-07:10:27  31 seconds during SSR failover

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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.