Mars Global Surveyor Status Report 13 June 2001

Wednesday, June 13, 2001 (DOY 157/19:00:00 to DOY 164/19:00:00 UTC)

Launch / Days since Launch = Nov. 7, 1996 / 1680 days

Start of Mapping / Days since Start of Mapping = April 1, 1999 / 804 days

Total Mapping Orbits = 10,129

Total Orbits = 11,812

Recent Events:

Background Sequences – The spacecraft is operating nominally in performing
the beta-supplement daily recording and transmission of science data. The
mm146 sequence executed successfully from 01-158 (6/7/01) through 01-160
(6/09/01). The mm147 sequence has performed well since it started on 01-161
(6/10/01). It terminates on 01-164 (6/13/01). The mm148 sequence,
successfully uplinked on 01-163 (6/12/01), begins executing on 01-165
(6/14/01).

Other – Nine more Roll Only Targeted Observations (ROTOs) were performed
since the last report. MGS has completed 126 ROTOs to date.

Spacecraft Health:

All subsystems report good health and status.

Uplinks:

There have been 18 uplinks to the spacecraft during the past week, including
new star catalogs and ephemeris files, instrument command loads, the
background sequences cited above, and ROTO mini-sequences mz107 & mz108.
There have been 5,437 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).