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Mars Global Surveyor Status
Mars Global Surveyor Status
10 Apr 2002
(Source: Jet Propulsion Laboratory)

Mars Global Surveyor Status Report
Wednesday, April 10, 2002 (DOY 093/19:00:00 to DOY 100/19:00:00 UTC)

Launch / Days since Launch = Nov. 7, 1996 / 1981 days
Start of Mapping / Days since Start of Mapping = April 1, 1999 / 1105 days
Total Mapping Orbits = 13,809
Total Orbits = 15,492

Recent Events:

Background Sequences - We have recovered MGS from C-Mode. It is nadir pointed with downlink communications through the HGA. An on-board script that is triggered every time the spacecraft emerges from solar eclipse is controlling HGA movement and TWTA cycling. The mm168 background sequence begins tonight at 23:57:00 SCET UTC on 02-101 (4/10/02). It will return the spacecraft to the relay-16 attitude and commence normal operations.

Other - All on-board recorded data have been played back. A STAREX flight software patch has been uplinked to prevent attitude knowledge from being corrupted if star processing is reset while MGS is pointed off-nadir. The MOC has been powering up and is imaging MARS.

No ROTOs were accomplished this week. MGS has completed 235 ROTOs to date.

Spacecraft Health:

All spacecraft subsystems report good health and status.

Uplinks:

There have been 60 uplinks to the spacecraft during the past week, including C-mode recovery commands, new star catalogs and ephemeris files, instrument command loads, STAREX flight software patch, the mz168 return to nadir mini-sequence, the mz169 data playback mini-sequence, the mm168 background sequence, and the mz170 science instrument turn-on minisequence. 6,561 command files have been radiated to the spacecraft since launch.

Upcoming Events:

The MOLA, MAG/ER, and TES science instruments will be powered on 02-101 (4/10/02).

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Mars Global Surveyor Status Report
Wednesday, April 03, 2002 (DOY 086/19:00:00 to DOY 093/19:00:00 UTC)

Launch / Days since Launch = Nov. 7, 1996 / 1974 days
Start of Mapping / Days since Start of Mapping = April 1, 1999 / 1098 days
Total Mapping Orbits = 13,723
Total Orbits = 15,406

Recent Events:

Background Sequences - The mm164 sequence executed successfully from 02-087 (3/28/02) through 02-089 (3/30/02). The mm165 sequence performed well from 02-090 (3/31/02) until it was terminated prematurely by Contingency mode (C-mode). The spacecraft entered C-mode at 22:22:21 SCET UTC on 02-091 (4/01/02) due to a star processing problem. Presently the spacecraft team is progressing through the C-mode recovery procedure. The spacecraft is performing nominally in the C-mode configuration. The DSN stations are able to lock onto the 10 bps downlink signal and command at the 7.8125 bit rate.

MGS should be able to achieve inertial reference later this evening, allowing us to return to a nadir attitude within the next couple of days. Playing back data, powering up science instruments, and returning to background stored sequence control will follow. The recovery process will also include modifying flight software to prevent corrupting attitude knowledge when star processing is reset while MGS is pointed off-nadir. The spacecraft team has discovered that a small subroutine within the flight software is incompatible with sustained off-nadir operations. MGS software was designed for a nadir pointed mapping mission. Off-nadir mapping operations started in August 2001 to extend mission life by conserving propellant.

Other - MGS successfully executed one ROTO imaging scan on 02-088 (03/29/02) in the MZ167 mini-sequence. MGS has completed 235 ROTOs to date.

Spacecraft Health:

All spacecraft subsystems report good health and status.

Uplinks:

There have been 37 uplinks to the spacecraft during the past week, including new star catalogs and ephemeris files, instrument command loads, the mm165 background sequence, and C-mode recovery commands. 6,561 command files have been radiated to the spacecraft since launch.

Upcoming Events:

The project will complete the C-mode recovery, fix the flight software, power the science instruments, and return MGS to background stored sequence control.

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Last Updated: 15 Apr 2002