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Mars Global Surveyor Status Report
Mars Global Surveyor Status Report
6 Jun 2001
(Source: Jet Propulsion Laboratory)

(DOY 150/19:00:00 to DOY 157/19:00:00 UTC)

Launch / Days since Launch = Nov. 7, 1996 / 1673 days
Start of Mapping / Days since Start of Mapping = April 1, 1999 / 797 days
Total Mapping Orbits = 10,043
Total Orbits = 11,726

Recent Events:

Background Sequences - The spacecraft is operating nominally in performing the beta-supplement daily recording and transmission of science data. The mm144 sequence executed successfully from 01-151 (5/31/01) through 01-153 (6/02/01). The mm145 sequence has performed well since it started on 01-154 (6/03/01). It terminates on 01-157 (6/06/01). The mm146 sequence, successfully uplinked on 01-156 (6/05/01), begins executing on 01-158 (6/07/01).

Other - Ten more Roll Only Targeted Observations (ROTOs) were performed since the last report. MGS has completed a total of 117 ROTOs to date.

Spacecraft Health:

All subsystems report good health and status.

The Sun Monitor Ephemeris fault protection is disabled to prevent another C-Mode entry due to sun-sensor shadowing by the HGA. Sun-sensor shadowing is the most likely cause of the 5/2/01 entry into C-Mode. The shadowing was caused by a combination of planetary geometry and beta-supplement HGA positioning. The 35 degree Solar Panel offpoint caused the SAM sun-sensor instead of the SAP sun-sensor to be selected for sensing sun position. Flight software could not accurately compute sun position when the SAM sun-sensor became shadowed by the HGA. Other fault protection routines continue to protect MGS from losing its attitude knowledge.

Uplinks:

There have been 13 uplinks to the spacecraft during the past week, including instrument command loads, the background sequences cited above, and ROTO mini-sequences mz104, mz105, & mz106. There have been 5,419 command files radiated to the spacecraft since launch.

Upcoming Events:

DOY 01-172 (6/21/01) marks the end of the beta-supplement phase and the beginning of the nominal mapping phase of the mission. Planetary and orbital geometry will allow the HGA to auto-track the Earth without impacting the HGA boom. Nominal mapping sequences will not be as command intensive as the beta-supplement sequences. Therefore, 28-day background sequences will be the norm instead of the 3 and 4 day beta-supplement sequences.

Another MGS Mars Relay On-orbit UHF Test will be conducted with Stanford University between 01-177 (6/26/01) and 01-179 (6/28/01). MOLA Polar Scans are scheduled for 01-193 (7/12/01) and 01-194 (7/13/01).

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Last Updated: 8 Jun 2001