ACE Weekly 05/31/2011 - 06/06/2011 All ACE spacecraft subsystems are performing nominally. ======================================================================== Orbit/Attitude: Type Attitude Date 06/06/2011 DOY 157 2011 Thrusters 2R 4R+ 4R- Duration 16:01 min Start 16:28:39z Stop 16:44:40z HGAStart -8.02deg HGAStop +7.54deg SunStart 6.10deg SunStop 14.72deg SpinStart 5.0931rpm SpinStop 5.0978rpm Nutation 0.16deg Firing 82 pulses FuelUsed 0.2544lbs FuelRemain 128.4300lbs FinalSCMass 1362.690lbs 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 Update on NOAA Space Weather Prediction Center tracking of ACE NOAA has been filling the gap from the loss of NICT (Japan) with an ESA antenna in Kiruna, Sweden which started Thursday 06/02/2011. NOAA continues to pursue tracking capabilities at the Near Earth Network (NEN) Alaska Satellite Facility (ASF) and the NOAA's Gilmore Creek Facility. FDF is expected to provide INP files for ASF and Gilmore Creek in a few days. ======================================================================== Anomalies: DOY 150 05/30/2011 S-ACE-0523 S10-0007 Increase in SBE_CT_B SSR B Single Bit Error Count (SBE_CT_B) increased again from 7918 to 8447 since last checked on DOY 148 (05/28/2011). SBE_CT is tracked as a measure of SSR health. IMPACT: Minimal. Single Bit Errors are automatically corrected by the SSR. No non-correctable errors (Hard Single Bit Errors & Double Bit Errors) have occurred throughout the mission. SBE_CT_A SBE_CT_B 1999 15 2000 2001 2002 2003 270 286 2004 858 2005 2006 2118 2007 510 3238 2008 4533 2009 525 6839 2010 780 7339 2011 8447 DOY 152 06/01/2011 S-ACE-0614 G11-0041 DSS-27 Antenna Control Ground station needed to reset equipment for Antenna Monitor and Control (AMC). DR#G111638 IMPACT: Minimal. 13 minute delay in activities. No impact to NOAA Space Weather since the spacecraft was still in low-rate format. DOY 153 06/02/2011 S-ACE-0615 G11-0042 DSS-27 Red Ground station was unable to provide support; unable to move antenna on either axis. Fortunately, DSS-45 was available for a support later in the day. DR#G111654 IMPACT: Minimal. ACE automation is designed to move passes with no manual intervention based on the updated DSN schedule. No impact to NOAA Space Weather since the spacecraft was still in low-rate format during the earlier lost pass and DLR and WCDA were able to track ACE during that time.