ACE Weekly 06/08/2011 - 06/13/2011

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

No maneuvers were performed this week.  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

The GRAIL mission is expected to launch 09/08/2011.  ACE has reduced DSN
antenna time through September.  The current published DSN schedule
(through 09/18/2011) has ACE losing ~1 day worth of recorded data after
10 days.  The remainder of the September DSN schedule is being
negotiated.

During last week's solar activity, the ULEIS shutter autonomously
closed.  The ULEIS shutter can also close down to 6% and 1% if there is
enough solar activity.
	Thu Jun 9 2011, DOY 160 10:19:50z closed to 25%
	Thu Jun 9 2011, DOY 160 18:43:18z open to 100%

ULEIS autonomous shutter movement since 10/11/2001
	Year		# of shutter movements
	2001		31
	2002		43
	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		4
	2011		8
  
Update on NOAA Space Weather Prediction Center tracking of ACE
The NICT antenna (Japan) returned to service on Thursday 06/09/2011;
much more quickly than originally estimated.  NOAA SWPC is currently
receiving ACE data from the following antennas when ACE is at low-rate:
NICT (Japan), DLR (Germany), WCDA (Wallops), and ESA (Kiruna, Sweden).
NOAA SWPC continues to be interested in additional contingency antennas.


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Anomalies:

None