ACE Weekly 01/18/2011 - 01/24/2011

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        01/21/2011
	DOY         021 2011
	Thrusters   2R 4R+ 4R-
	Duration    15:07 min
	Start       13:55:38z
	Stop        14:10:45z
	HGAStart    -7.85deg
	HGAStop     +7.61deg
	SunStart     4.99deg
	SunStop     16.81deg
	SpinStart   5.0719rpm
	SpinStop    5.0752rpm
	Nutation     0.16deg
	Firing      77 pulses
	FuelUsed      0.2411lbs
	FuelRemain  131.1264lbs
	FinalSCMass 1365.387lbs

The next attitude maneuver is scheduled for Monday 02/07/2011.

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OCRs:

None

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Activities:

Data Capture:  100%  DOY 016-023 2011

The risk of data loss has returned to normal.  The viewperiod from
northern hemisphere antennas has been increasing since mid-December and
is now 9 hours each day.  Five of the 7 DSN antennas that ACE uses are
in the northern hemisphere.  The overlap with the Mars missions,
however, will continue through March 2011.

Winter data loss in recent years
	Dec 2006-Jan 2007    4.2 hours
	Dec 2007-Jan 2008    1.9 hours
	Dec 2008-Jan 2009    0.0 hours
	Dec 2009-Jan 2010    0.0 hours
	Dec 2010-Jan 2011    1.5 hours

Note that the limited data loss is the result of finding DSN time when
problems occur and luck.  Data loss can easily be much higher.

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Anomalies:

DOY 018  01/18/2011  S-ACE-0579  G11-0007  ITOS tm_controller
Before Beginning Of Track, ITOS had problems connecting telemetry,
"timeout reading from tm_controller".  ITOS was stopped and restarted.
IMPACT:  Manual intervention required.  Activities delayed 90 minutes.
No impact to NOAA Space Weather Prediction Center (SWPC).  The
spacecraft was in RTSW format during this time.

DOY 021  01/21/2011  S-ACE-0580  G11-0008  DSN DCD Failure
ACE telemetry stopped flowing to the MMOC at 15:11:31z due to failures
of both DSN DCD systems (Data Capture and Delivery).  Telemetry returned
at 16:00:39z, but SLE system provided back-logged data starting at
15:49:39z (the previous 20 minutes).  DR#N107037
IMPACT:  49 minute telemetry outage; 20 minutes of which was delivered
after the return of the DCD system.  The data outage also impacted NOAA
SWPC.

DOY 023  01/23/2010  S-ACE-0581  G11-0009  ITOS tm_controller
Before Beginning Of Track, ITOS had problems connecting telemetry,
"timeout reading from tm_controller".  ITOS was stopped and restarted.
IMPACT:  Manual intervention required.  Activities delayed 13 minutes.
No impact to NOAA SWPC, spacecraft was in RTSW format.

DOY 024  01/24/2010  S-ACE-0582  G11-0010  ITOS tm_controller & problems
Before Beginning Of Track, ITOS had problems connecting telemetry,
"timeout reading from tm_controller".  ITOS was stopped and restarted.
When ITOS was restarted, no telemetry was being received via SLE/MUS.
The additional problems had not been seen before, but were resolved with
a second restart of ITOS.
IMPACT:  Manual intervention required.  Activities delayed 38 minutes.
No impact to NOAA SWPC, spacecraft was in RTSW format.