Status Report

Mars Global Surveyor Status Report 19 Sep 2001

By SpaceRef Editor
September 19, 2001
Filed under , ,

Wednesday, September 19, 2001 (DOY 255/19:00:00 to DOY 262/19:00:00 UTC)

Launch / Days since Launch = Nov. 7, 1996 / 1778 days

Start of Mapping / Days since Start of Mapping = April 1, 1999 / 902 days

Total Mapping Orbits = 11,327

Total Orbits = 13,010

Recent Events:

Background Sequences – The spacecraft is operating nominally in performing
daily recording and transmission of science data. The mm153 sequence has
performed well since it started 01-156 (9/13/01). It terminates on 01-290

Other – MOLA Diagnostic Test #4 was performed on 01-256 (9/13/01). The MOLA
team is in the process of analyzing the resulting data.

Roll Only Targeted Observations (ROTO) were temporarily suspended pending
investigation of the C-Mode entry root cause. MGS entered C-Mode on 9/6/01
because the STAREX star processing software could not converge on a good
inertial attitude following a ROTO. The ROTO did not cause the C-Mode entry,
but STAREX performance may impact how we perform ROTOs in the future. MGS
has completed 198 ROTOs to date.

Spacecraft Health:

All subsystems report good health and status. The spacecraft team continues
to investigate the STAREX anomaly that caused the 9/6/01 C-Mode entry. The
MOLA instrument team is still investigating the MOLA anomaly of 01-181
(6/30/01). The MOC instrument required a hardware reboot to recover from an
anomaly that temporarily prevented it from returning properly formatted
science data.


There have been 28 uplinks to the spacecraft during the past week, including
new star catalogs and ephemeris files, TES instrument turn-on, MOC
instrument re-boots, and standard instrument command loads. 5,755 command
files have been radiated to the spacecraft since launch.

Upcoming Events:

Delta-DOR experiments are scheduled for 01-267 (9/24/01) and 01-269

SpaceRef staff editor.