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Mars Global Surveyor Status Report 25 Apr 2001

Status Report From: Jet Propulsion Laboratory
Posted: Wednesday, April 25, 2001

Wednesday, April 25, 2001 (DOY 108/19:00:00 to DOY 115/19:00:00 UTC)

Launch / Days since Launch = Nov. 7, 1996 / 1631 days
Start of Mapping / Days since Start of Mapping = April 1, 1999 / 755 days
Total Mapping Orbits = 9,530
Total Orbits = 11,213

Recent Events:

Background Sequences -- The spacecraft continues to operate nominally in performing the beta-supplement daily recording and transmission of science data. The mm132 sequence executed successfully from 01-109 (4/19/01) through 01-111 (4/21/01). The mm133 sequence has performed well since it started on 01-112 (4/22/01). It terminates on 01-115 (4/25/01). The mm134 sequence, successfully uplinked on 01-114 (4/24/01), begins executing on 01-116 (4/26/01).

Other - MGS transmitted high frequency spacecraft body rate data to Earth on 01-115 (4/25/01). The data will provide insight into the health of the -Y solar array hinge and the effects of solar array motion on TES data. MGS has performed 75 Roll Only Targeted Observations to date.

Spacecraft Health:

All subsystems report nominal health.

Uplinks:

There have been 12 uplinks to the spacecraft during the past week, including instrument command loads, the background sequences cited above, and ROTO mini-sequences mz091 through mz092.

The last two of three solar array position management scripts were modified to offset the commanded solar array positions by 25 degrees. Our goal is to extend the life of the Partial Shunt Assemblies by reducing the amount of excess power generated by the solar arrays. There have been 5,270 command files radiated to the spacecraft since launch.

Upcoming Events:

The mm135 background sequence will be uplinked on 01-117 (4/27/01). MOC Defocus Calibration Scans will be performed by the mm134 and mm135 sequences between 01-116 (4/26/01) and 01-123 (5/02/01). Radio Science Occultation Egress Scans are scheduled for 01-132 (5/12/01) and 01-133 (5/13/01). ROTO mini-sequences mz092 and mz093 will execute this next week.

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