ACE Weekly 06/21/2011 - 06/27/2011 All ACE spacecraft subsystems are performing nominally. ======================================================================== Orbit/Attitude: No maneuvers were completed this week. The next attitude maneuver and station keeping maneuver are 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 during September. The current published DSN schedule (through 09/18/2011) has ACE losing ~10% data. The remainder of the September DSN schedule is being negotiated. The SOHO mission is experiencing uplink problems with DSN DSS-27. On Tuesday 06/21/2011, the ACE pass with DSS-24 was shortened from 3.5 hours to 1.5 hours so that SOHO could use DSS-24 after having problems with DSS-27. The ACE playback was caught up over the next 2 passes. No data loss occurred. Manual intervention was required to shorten the Tuesday pass since the pass had already started. The DSS-27 ground antenna will be down for the next 4 weeks starting Monday 6/27/2011. DSS-27 is having an Antenna Controller Replacement (ACR), a 250-Watt S-Band Uplink Install and Cable Wrap Protection. ACE uses DSS-27 for most of the passes since ACE's RF Link Margin does not have problems with DSS-27. Fortunately, ACE has not had problems acquiring time with on the other DSN antennas during these 4 weeks. This is mostly due to longer summertime viewperiods for ACE and other missions viewperiods having little overlap with ACE. ======================================================================== Anomalies: DOY 173 06/22/2011 S-ACE-0617 G11-0044 JPL SLE TLM Provider Problem The JPL SLE TLM Provider stopped sending telemetry 1 hour after the pass had started. JPL requested that ACE disconnect and reconnect the SLE TLM connections, but at that moment the MMOC SLE software (MUS) crashed. The MUS software was restarted within 10 minutes and several connections to MUS were re-established. DR#N107434 IMPACT: Manual intervention required.