Mars Pathfinder Mission Status - 31 January 1997

From: Jan Wee <>
Subject: Mars Pathfinder Mission Status - 31 January 1997
Date: Sat, 01 Feb 1997 06:57:15 -0600


31 January 1997

The spacecraft continues to be in excellent health, and is now about 16 million
km from Earth. Key activities completed this week include successful completion
of the K=15, R=1/6 convolutional code tests and resolution of the attitude
control software glitch detected last week. Attitude control software has been
re-enabled and is currently operating nominally. In addition, we verified that
the noise seen during ASI/MET health checks is due to the Propulsion Drive
Electronics. This noise appears to be radiative in nature, and will not be an
issue for surface operations because the PDE is located on the cruise stage.

The Uplink Problem Tiger team has developed a plausible explanation for the
majority of the command rejections and the CDU In Lock conditions. It involves
harmonics from the uplink sweep locking up the CDU and pulling it away from the
nominal command frequency. The team is developing a test plan to confirm this
hypothesis and is also gathering information about the incidents where the CDU
went into lock while we were not tracking.

An Operational Readiness Test (ORT) of the Sol 1-2 sequences was run on Jan 27
and 28. The sequences used were identical to the last pre-launch surface ORT.
The ORT was successful in that all of the sequences were executed properly by
the simulated lander and rover. However, a number of relatively minor problems
were logged during the test. These problems were reviewed and action has been
assigned in all cases for problem resolution.

Nineteen investigators have been selected by NASA Headquarters in response to
the Announcement of Opportunity for selection of Mars Pathfinder Participating
Scientists and a Facility Instrument Science Team for the Atmospheric Structure
Instrument/Meteorology Package. An "All Hands" Pathfinder Science Team meeting
has been set up for Feb. 5-7, 1997 at JPL to begin integrating the new
investigators into the Experiment Operations Team.

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