ACE Weekly 04/21/2010 - 04/27/2010

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver is
scheduled for Friday 04/30/2010.

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OCRs:

ULEIS-074 Exercise ULEIS Shutter
The ULEIS instrument has a shutter that autonomously closes during
elevated solar activity (enabled in September 2001).  The shutter had
not moved since DOY 349 2006 due to a quiet sun.  OCR ULEIS-074 was to
manually close (25%) and reopen the shutter (100%) to confirm that the
shutter is still operating properly.  However, on DOY 095 (4/1/2010
05:15:36-12:20:28), the ULEIS shutter successfully closed (25%) and
reopened (100%) due to the solar activity.  The OCR is on file for
future execution if needed.

ULEIS shutter movement since 02/01/2002
	Year		# of shutter movements
	2002		44
	2003		38
	2004		34
	2005		36   with 1 error on 09/13/05 10:16:02z
	2006		12
	2007		0
	2008		0
	2009		0
	2010		2

Note, ULEIS will flag an error if the shutter does not open or close
properly.  This flag is checked during each pass.  If the flag is set,
the shutter is opened to 100% to return it to a specific position and
the flag is cleared.

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Activities:

Data Capture:  100%  DOY 108-115 2010


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Anomalies:

DOY 114  04/24/2010  S-ACE-0499  G10-0022  DSS-65 Unable To Move Antenna
DSS-65 couldn't release the antenna brakes.  This had started during the
previous pass with SOHO (0747z).  ACE Beginning Of Track was at 1255z.
The antenna was fixed at 1445z.  The pass was completed with the 90
minutes remaining (1455-1625z).
IMPACT:  The FOT went to the MMOC to ensure that the MMOC software would
function properly.  Since there was some time available in the pass, the
procedures completed successfully without manual intervention.  The SSR
playback was caught up over the next 2 passes.