Mars Global Surveyor Update - November 14, 2001

Status Report From: Jet Propulsion Laboratory
Posted: Wednesday, November 14, 2001

Mars Global Surveyor Status Report
Wednesday, November 14, 2001 (DOY 311/19:00:00 to DOY 318/19:00:00 UTC)

Launch / Days since Launch = Nov. 7, 1996 / 1834 days
Start of Mapping / Days since Start of Mapping = April 1, 1999 / 958 days
Total Mapping Orbits = 12,011
Total Orbits = 13,694

Recent Events:

Background Sequences - The spacecraft is operating nominally in performing daily recording and transmission of science data. TES and MOC images are being supplied to the Mars Odyssey team to support their aerobraking campaign. The MM154B sequence has performed well since it started on 01-295 10/22/01). It terminates on 01-319 (11/15/01). MM155A starts tonight at 01-318 (11/14/01), 23:57 SCET UTC.

Other - Roll Only Targeted Observations (ROTOs) have been suspended to reduce the probability of entering C-Mode during the initial stages of Mars Odyssey aerobraking. The C-Mode investigation continues. Its purpose is to determine the root cause of the latest C-Mode entry and identify risk mitigation steps that will allow MGS to resume ROTO operations during Odyssey aerobraking. MGS has completed 207 ROTOs to date.

The Sun Monitor Ephemeris fault detection was re-enabled with updated parameters. The new parameters will prevent transient shadowing of the sun sensors from triggering C-mode entry and allow additional C-mode protection if attitude knowledge becomes corrupted.

Spacecraft Health:

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.


There have been 12 uplinks to the spacecraft during the past week, including new star catalog and ephemeris files, instrument command loads, and the MM155 background sequence. 5,962 command files have been radiated to the spacecraft since launch.

Upcoming Events:

MGS will continue to support Odyssey during the aerobraking phase of the Odyssey mission by supplying TES and MOC images of the Martian surface. Martian dust storms can bloom into the upper atmosphere, significantly increasing the atmospheric density and posing a threat to Odyssey. The MGS images will provide the Odyssey team the opportunity to avoid the dust storms if they occur.

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