Mars Global Surveyor Status Report
20 Jun 2001
(Source: Jet Propulsion Laboratory)
(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
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.
All subsystems report good health and status.
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.
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).