ACE Weekly 05/08/2012 - 05/14/2012

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

	Type        Attitude       
	Date        05/14/2012
	DOY         135 2012
	Thrusters   2R 4R+ 4R-
	Duration    15:42 min
	Start       13:22:51z
	Stop        13:38:33z
	HGAStart    -6.73deg
	HGAStop     +7.82deg
	SunStart     4.30deg
	SunStop     10.92deg
	SpinStart   5.0582rpm
	SpinStop    5.0634rpm
	Nutation     0.18deg
	Firing      80 pulses
	FuelUsed      0.2434lbs
	FuelRemain  121.8468lbs
	FinalSCMass 1356.107lbs

The next attitude maneuver and Station-Keeping #61 are scheduled for
Friday 05/25/2012.

The sun angle drifted below the 4 degree sun constraint from Monday
5/7/2012 (128-23:45:32) to Monday 5/14/2012 (135:05:24:28), reaching 2.8
degrees on Thursday 5/10/2012.  There was no impact to the sun pulse
generation.  The reason for drifting through the sun constraint was to
improve the antenna pointing towards earth during the SEZ transit and to
increase the time between maneuvers.

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OCRs:

None

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Activities:

Data Capture:  99.995%  DOY 127-134 2012
DOY 130 17:16:37-17:17:07  31 seconds during SSR failover

DSN antenna time on Tuesday 5/8 (DOY 129) and Wednesday 5/9 (DOY 130)
was given to the SOHO Mission so that they could recover from multiple
Emergency Sun Reacquisition (ESR).  ACE data recovery was delayed a
couple of days, but eventually all data was captured except for a short
31 second gap during the SSR failover.


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Anomalies:

DOY 134  05/13/2012  S-ACE-0523  S10-0007  Increase in SBE_CT_B
SSR B Single Bit Error Count (SBE_CT_B) increased from 11714 to 12864
between 5/06/2012 and 5/13/2012.  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
	2012             12864

Update on AR#S12-0001  S-ACE-0639  SWEPAM-E Overcount Alarm
The SWEPAM-Electron Overcount Alarm flagged on DOY 131 and DOY 135.  It
had not been flagging since DOY 117.  The instrument team is working the
next course of action, but their time is limited.  IMPACT:  The
instrument automatically reduces voltages when the overcount alarm
occurs.