Mars Global Surveyor Status Report 4 Apr 2001

Wednesday, April 04, 2001 (DOY 087/19:00:00 to DOY 094/19:00:00 UTC)

Launch / Days since Launch = Nov. 7, 1996 / 1610 days

Start of Mapping / Days since Start of Mapping = April 1, 1999 / 734 days

Total Mapping Orbits = 9,272

Total Orbits = 10,955

Recent Events:

Background Sequences — The spacecraft continues to operate nominally
in performing the beta-supplement daily recording and transmission of science
data. The mm126 sequence executed successfully from 01-088 (3/29/01) through
01-090 (3/31/01). The mm127 sequence has performed well since it started
on 01-091 (4/01/01). It terminates on 01-094 (4/04/01). The mm128 sequence,
successfully uplinked on 01-093 (4/03/01), begins executing on 01-095 (4/05/01).

Other – MGS performed 6 Roll Only Targeted Observations since the last
status report, bringing the total number of ROTOs to 46.



Spacecraft Health:

All subsystems report nominal health.

Uplinks: There have been 15 uplinks to the spacecraft during the past
week, including new star catalogs and ephemeris files, instrument command
loads, the background sequences cited above, ROTO mini-sequence mz084, and
Radio Science Occultation Egress Scan mini-sequence mz085. There have been
5,228 command files radiated to the spacecraft since launch.

Upcoming Events:

The mm129 background sequence will be uplinked on 01-096 (4/06/01).
ROTO mini-sequences mz086 and mz087 will be uplinked and executed this next
week. Radio Science Occultation Egress Scans, contained in the mz085 mini-sequence,
will take place on 01-095 (4/5/01) and 01-096 (4/6/01).