ACE Weekly 12/31/2008 - 01/06/2009 All ACE spacecraft subsystems are performing nominally. ============================================================================ Orbit/Attitude: No attitude maneuvers were completed this week. The next attitude maneuver is scheduled for Friday 01/09/2009. =========================================================================== OCRs: DOY 001 (01/01/2009) SC_09_001 Commanding from MMOC/ITOS for Testing Multi-Mission Operations Center (MMOC) and ITOS are being developed for future ACE operations. Tests have already been performed from the MMOC to DSN's Test Facility (DTF-21). A commanding test with the spacecraft using DSS-27 is scheduled for Thursday 01/29/2009. ============================================================================ Activities: Data Capture: 100% DOY 363-004 2009 There is a higher than normal risk of data loss from October 2008 through February 2009. If there are problems with the passes, it may not be possible to acquire additional DSN time. This higher-risk period has been occurring every winter for the past couple of years. For more information refer to 10/14/2008 weekly. ============================================================================ Anomalies: DOY 001 01/01/2009 S-ACE-0404 G09-0001 DSS-46 MPA Reboot The ground station had problems with the MPR/MPC interface which was affecting ranging data. The ground station requested rebooting the MPA (Metric and Pointing Assembly). The Ops Chief contacted the FOT (off-shift) and approval was given. After the reboot, telemetry was no longer reaching the ACE MOC. The FOT contacted the Ops Chief and the telemetry connection was restored. DR#C106746 IMPACT: 30 minutes of range data lost. 100 minutes of no telemetry to ACE MOC or NOAA. Telemetry was available from the DSN CDR. DOY 005 01/05/2009 S-ACE-0405 G09-0002 ROBOTT Incorrect Times The ACE MOC automation software (ROBOTT) has a known issue with the week 2 DSN schedule when the week 1 schedule has days from the previous year. Instructions had been created when the problem was discovered in 2008 (AR#G08-0002). However, the process did not correctly terminate the download of the schedule and manual intervention was required on Monday DOY 005 to modify the schedule and restart the automation software. IMPACT: Manual intervention required to fix the schedule before the pass started. Note that ACE is expected to transition to a new operations environment before the end of 2009. The new operations environment will likely have a different set of known issues. DOY 366 12/31/2008 S-ACE-0406 G09-0003 TPOCC History File Problem TPOCC did not write playback data to the A4 history file, but did write the data to the AB history file. This is the second occurrence in 3 weeks. The resolution was discovered with AR#G09-0004. IMPACT: Minimal. DOY 006 01/06/2009 S-ACE-0407 G09-0004 AC1FE1A Out Of Memory AC1FE1A was out of memory. TPOCC was unable to execute some directives and the procedures were paused before commanding. The problem is due to processes remotely controlling and monitoring the SLE workstations (ac1sle1 and ac2sle2) that had not properly terminated. IMPACT: Manual intervention required to kill the programs and free the memory. Activities delayed 25 minutes while troubleshooting the problem.