ACE Weekly 11/29/2011 - 12/05/2011
All ACE spacecraft subsystems are performing as expected.
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Orbit/Attitude:
Type Attitude
Date 12/02/2011
DOY 336 2011
Thrusters 2R 4R+ 4R-
Duration 16:23 min
Start 21:11:07z
Stop 21:27:30z
HGAStart -8.52deg
HGAStop +7.54deg
SunStart 5.24deg
SunStop 15.18deg
SpinStart 5.0414rpm
SpinStop 5.0458rpm
Nutation 0.09deg
Firing 83 pulses
FuelUsed 0.2595lbs
FuelRemain 125.1208lbs
FinalSCMass 1359.381lbs
The next attitude maneuver and station keeping #59 are scheduled for
Thursday 12/15/2011.
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OCRs:
None
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Activities:
Data Capture: 100% DOY 331-338 2011
FDF stopped delivering ACE products (ephemeris, INP, IIRV, etc) to the
old FDF Product Center on Monday December 5, 2011. FDF products for the
antennas supporting NOAA SWPC are being emailed to the sites. FDF
products for MMOC operations are being retrieved from the new FDF
server.
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.
Mon Nov 28 2011, DOY 332 21:09:32z closed to 25%
Wed Nov 30 2011, DOY 334 01:27:39z open to 100%
Background Information:
The other spacecraft reconfiguration that can occur during solar
activity is the CRIS Image Intensifier powering off, which has not
occurred since 2006. The following table shows the frequency of these
onboard reconfigurations.
Year CRIS-II off ULEIS shutter movement
---- ----------- ----------------------
2000 3 N/A
2001 5 31 (after 10/11/2001)
2002 2 43
2003 1 38
2004 1 34
2005 3 36
2006 1 12
2007 0 0
2008 0 0
2009 0 0
2010 0 4
2011 0 24
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Anomalies:
None