SETI MARS CLIMATE ORBITER / MARS POLAR LANDER MISSION STATUS


Bob Cutter (bcutter@teal.csn.net)
Mon, 13 Sep 1999 11:24:03 -0600


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>Date: Mon, 13 Sep 1999 08:53:45 -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: 937240340.009
>
>MARS CLIMATE ORBITER / MARS POLAR LANDER MISSION STATUS
>
>Sep. 08, 1999
>17:00 (PDT)
>
>
>Mars Climate Orbiter
>____________________
>
> During the past week the flight team mounted an intense effort to conduct
>a series of diagnostic tests of the spacecraft's ability to safely move its
>solar array in and out of its stowed position. This testing was motivated
>by behavior observed following the completion of TCM-3 on Jul. 25, in which
>the spacecraft had some difficulty in its initial attempt to unstow the
>array following the maneuver. The array was ultimately unstowed and
>repositioned to its proper cruise orientation by the spacecraft's
>articulation control system on that day.
>
> Last Friday (Sep. 3rd), in-flight testing revealed that small tabs on
>the solar array, designed to passively restrain the array while stowed,
>were making unexpected contact with the spacecraft bus during the
>stow/unstow procedure. Over the weekend the team updated the stow/unstow
>procedure to avoid the contacted area and retested these commands in the
>MCO simulator in Denver, in preparation for an additional in-flight test
>which was conducted today. This test, just completed, verified that the
>team's modified commands succeeded in accomplishing the stow/unstow
>movements without any spacecraft/solar array contact. The team is now
>proceeding with additional testing of the command sequences for Mars Orbit
>Insertion and aerobraking using the updated stow/unstow procedure.
>
> In addition, the flight team is beginning development of the fourth and
>final course correction, TCM-4, to be executed prior to Mars arrival. TCM-4
>is scheduled to take place in one week, eight days prior to orbit insertion.
>
>MARS CLIMATE ORBITER IS 15 DAYS FROM MOI.
>
>Mars Polar Lander
>_________________
>
> Mars Polar Lander continues to perform well, with no activities planned
>during the previous week. The flight team has finished preparations for the
>second and final comprehensive science instrument checkout, which will take
>place tomorrow (Sep. 9th). Also included is the 8th check of meteorology
>package sensors, which have been conducted approximately once per month
>throughout cruise. Following this activity, data transmission from the
>instruments will be completed by Sep. 12th. Subsequently, the next MPL
>activity scheduled to occur is Trajectory Correction Maneuver #3 (TCM-3),
>on Oct. 7th.
>
>------------------------------------------------------------------
> John L. Callas Jet Propulsion Laboratory
> 1-818-354-9088 (Office) Mail Stop 169-327
> 1-818-354-1004 (Fax) 4800 Oak Grove Drive
> John.L.Callas@jpl.nasa.gov Pasadena, California 91109
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>



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