SETI MARS CLIMATE ORBITER / MARS POLAR LANDER MISSION STATUS


Bob Cutter (bcutter@teal.csn.net)
Thu, 16 Sep 1999 10:43:59 -0600


>X-Sender: jcallas@pop.jpl.nasa.gov
>Date: Thu, 16 Sep 1999 08:12:19 -0700
>Reply-To: "John L. Callas" <John.L.Callas@JPL.NASA.GOV>
>Sender: MARS-NET <MARS-NET@VM.STLAWU.EDU>
>From: "John L. Callas" <John.L.Callas@JPL.NASA.GOV>
>Subject: MARS CLIMATE ORBITER / MARS POLAR LANDER MISSION STATUS
>To: MARS-NET@VM.STLAWU.EDU
>X-UIDL: 937493509.003
>
>MARS CLIMATE ORBITER / MARS POLAR LANDER MISSION STATUS
>
>Sep. 15, 1999
>17:00 (PDT)
>
>
>Mars Climate Orbiter
>____________________
>
> The flight team completed its preparations for Mars Climate Orbiter's
>fourth and final course correction, TCM-4, on Tuesday (Sep. 14),
>transmitting the TCM-4 command sequence to the spacecraft that evening. MCO
>successfully executed TCM-4 this morning, with a 15 s burn starting at
>09:40 PDT, adjusting its velocity by 1.37 m/s. Spacecraft performance was
>excellent; the updated gimble angle trajectory for the stow/unstow
>movements of the solar array worked just as expected, following last week's
>in-flight verification tests.
>
> Preparation of the MCO spacecraft for Mars Orbit Insertion (MOI) on Sep.
>23 has begun. A complete audit of the flight processor's file system was
>conducted during the past week, verifying both file names and contents
>versus the equivalent file system in the MCO ground-based simulator, which
>has been operating 24 hr/day, seven days per week in preparation for Mars
>arrival. On Friday (Sep. 17), a serlies of new files will be transmitted to
>the spacecraft, placing it into the correct pre-MOI configuration. The
>baseline MOI command sequence will also be loaded at the same time; there
>is one scheduled updated to the main engine burn parameters, which will
>take place on Monday of next week (Sep. 20). On the evening of Sep. 21, the
>flight team will transition to a round-the-clock schedule of on-console
>spacecraft monitoring prior to MOI and post-MOI operations commencing on
>Sep. 23
>
>
>MARS CLIMATE ORBITER IS 8 DAYS FROM MOI.
>
>Mars Polar Lander
>_________________
>
> Mars Polar Lander experienced a quiescent week of nominal cruise
>operations. Playback of telemetry data collected onboard from the
>spacecraft's science instruments during instrument checkout #2 on Sep. 9
>has been completed. One more repeat playback is scheduled in the coming
>week to ensure any gaps identified in the data set are filled. Lander
>activity is intentionally kept low during the next three weeks while the
>flight team maintains its focus on the critical MCO events leading up to
>and following orbit insertion.
>
>



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