Status Report

Mars Global Surveyor Status Report 20 June 2001

By SpaceRef Editor
June 20, 2001
Filed under , ,

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.


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).

SpaceRef staff editor.