ACE Weekly 06/08/2011 - 06/13/2011 All ACE spacecraft subsystems are performing nominally. ======================================================================== 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. ======================================================================= OCRs: None ======================================================================== 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. ======================================================================== Anomalies: None