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Mars Global Surveyor Status Report 20 June 2001

Status Report From: Jet Propulsion Laboratory
Posted: Wednesday, June 20, 2001

Wednesday, June 20, 2001 (DOY 164/19:00:00 to DOY 171/19:00:00 UTC)

Launch / Days since Launch = Nov. 7, 1996 / 1687 days
Start of Mapping / Days since Start of Mapping = April 1, 1999 / 811 days
Total Mapping Orbits = 10,214
Total Orbits = 11,897

Recent Events:

Background Sequences - The spacecraft is operating nominally in performing the beta-supplement daily recording and transmission of science data. The mm148 sequence executed successfully from 01-165 (6/14/01) through 01-167 (6/16/01). The mm149 sequence has performed well since it started on 01-168 (6/17/01). It terminates on 01-171 (6/20/01). The mm150 sequence, successfully uplinked on 01-170 (6/19/01), begins executing on 01-172 (6/21/01). The start of mm150 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. Therefore, background command sequences can take advantage of the on-board command scripts originally designed for the nominal mapping mission. 28-day background sequences will become the norm instead of the 3 and 4 day beta-supplement sequences.

Other - Eleven more Roll Only Targeted Observations (ROTOs) were performed since the last report. MGS has completed 137 ROTOs to date.

Spacecraft Health:

All subsystems report good health and status.

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 mz109 & mz110. We also updated Solar Array AEM Script #1 timing to avoid potential electromagnetic interference (EMI) with the solar arrays during HGA transmissions to Earth. There have been 5,449 command files radiated to the spacecraft since launch.

Upcoming Events:

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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