Wednesday, September 12, 2001 (DOY 248/19:00:00 to DOY 255/19:00:00 UTC)
Launch / Days since Launch = Nov. 7, 1996 / 1771 days
Start of Mapping / Days since Start of Mapping = April 1, 1999 / 895 days
Total Mapping Orbits = 11,241
Total Orbits = 12,924
Background Sequences - The mm152 background sequence terminated unexpectedly on 01-249 (9/6/01) at 05:34:41 SCET UTC when MGS entered Contingency Mode (C-Mode) due to star processing difficulties. The MGS team has been successful in recovering from C-Mode and playing back the data recorded on 01-248 (9/5/01) and 01-249 (9/6/01) up to the point of C-Mode entry. MGS is presently in the Relay-16 attitude with the MOC and MAG/ER instruments powered back on. MOLA will be powered during the MOLA Diagnostic Test #4 on 01-256 (9/13/01) and TES will be powered on 01-258 (9/15/01). The spacecraft will be operating nominally once the mz153 background sequence goes active later today at 01-155 (9/12/01) 23:59:00.
Other - The Delta-DOR experiment scheduled for 01-253 (9/10/01) and the Solar Array (SA) and High Gain Antenna (HGA) flexible modes baseline diagnostic test scheduled for 01-154 (9/11/01) did not take place due to C-Mode recovery.
One Roll Only Targeted Observation (ROTO) was successfully performed before the spacecraft entered C-Mode. MGS has completed 198 ROTOs to date.
All subsystems report good health and status. The spacecraft team is investigating the spacecraft's difficulty in processing stars leading to the C-Mode entry. The MOLA instrument team is still investigating the MOLA anomaly of 01-181 (6/30/01). MOLA Diagnostic Test #4 is scheduled for 01-256 (9/13/01).
There have been 112 uplinks to the spacecraft during the past week, including C-Mode recovery files, new star catalogs and ephemeris files, instrument command loads, and the MM153 background sequence. 5,727 command files have been radiated to the spacecraft since launch.
Delta-DOR experiments are scheduled for 01-267 (9/24/01) and 01-269 (9/26/01). MOLA Diagnostic Test #4 will take place on 01-156 (9/13/01).