ACE Weekly 05/31/2011 - 06/06/2011

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude       
	Date        06/06/2011
	DOY         157 2011
	Thrusters   2R 4R+ 4R-
	Duration    16:01 min
	Start       16:28:39z
	Stop        16:44:40z
	HGAStart    -8.02deg
	HGAStop     +7.54deg
	SunStart     6.10deg
	SunStop     14.72deg
	SpinStart   5.0931rpm
	SpinStop    5.0978rpm
	Nutation     0.16deg
	Firing      82 pulses
	FuelUsed      0.2544lbs
	FuelRemain  128.4300lbs
	FinalSCMass 1362.690lbs

The next attitude maneuver and a spin down maneuver are scheduled for
Friday 06/17/2011.  The next station keeping maneuver is scheduled for
Thursday 06/30/2011.

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OCRs:

None


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Activities:

Data Capture:  100%  DOY 149-156 2011

Update on NOAA Space Weather Prediction Center tracking of ACE
NOAA has been filling the gap from the loss of NICT (Japan) with an ESA
antenna in Kiruna, Sweden which started Thursday 06/02/2011.  NOAA
continues to pursue tracking capabilities at the Near Earth Network
(NEN) Alaska Satellite Facility (ASF) and the NOAA's Gilmore Creek
Facility.  FDF is expected to provide INP files for ASF and Gilmore
Creek in a few days.

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Anomalies:

DOY 150  05/30/2011  S-ACE-0523  S10-0007  Increase in SBE_CT_B
SSR B Single Bit Error Count (SBE_CT_B) increased again from 7918 to
8447 since last checked on DOY 148 (05/28/2011).  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             8447

DOY 152  06/01/2011  S-ACE-0614  G11-0041  DSS-27 Antenna Control
Ground station needed to reset equipment for Antenna Monitor and Control
(AMC).  DR#G111638
IMPACT:  Minimal.  13 minute delay in activities.  No impact to NOAA
Space Weather since the spacecraft was still in low-rate format.

DOY 153  06/02/2011  S-ACE-0615  G11-0042  DSS-27 Red
Ground station was unable to provide support; unable to move antenna on
either axis.  Fortunately, DSS-45 was available for a support later in
the day.  DR#G111654
IMPACT:  Minimal.  ACE automation is designed to move passes with no
manual intervention based on the updated DSN schedule.  No impact to
NOAA Space Weather since the spacecraft was still in low-rate format
during the earlier lost pass and DLR and WCDA were able to track ACE
during that time.