ACE Weekly 11/29/2011 - 12/05/2011 All ACE spacecraft subsystems are performing as expected. ======================================================================== 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. ======================================================================= OCRs: None ======================================================================== 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 ======================================================================== Anomalies: None