Status Report

NASA Cassini Significant Events for 11/25/03 – 12/03/03

By SpaceRef Editor
December 5, 2003
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The most recent spacecraft telemetry was acquired from the Madrid
tracking station on Monday, December 1. The Cassini spacecraft is in an
excellent state of health and is operating normally. Information on the
present position and speed of the Cassini spacecraft may be found on
the “Present Position” web page located at

On-board activities this week included uplink of commands in preparation
for next week’s Probe pre-heating checkout activity, Visual and Infrared
Mapping Spectrometer (VIMS), Imaging Science Subsystem (ISS) and
Ultraviolet Imaging Spectrograph (UVIS) scattered light observations,
VIMS and ISS spectral calibrations, Magnetometer Subsystem and UVIS
Hydrogen Deuterium Absorption Cell background calibration rolls, and an
array demonstration over the DSN complex in Madrid.

On Sunday, Ion and Neutral Mass Spectrometer (INMS) personnel reported
an anomalous reboot, which resulted in a burst of alarms seen during the
corresponding DSN track. The instrument is in a safe state. Instrument
personnel have requested that it be restored to a normal sleep state by
December 24 in order to participate in a scheduled telemetry mode test.
Until then INMS will remain in a PROM state and be monitored by the team
until after upcoming Probe activities have completed.

Gravitational Wave Experiment (GWE) #3 ended on the evening of November
30. At that time commands to power off the Ka-band Exciter and Ka-band
Traveling Wave Tube Amplifier were executed. The Ka-band Translator has
been OFF throughout the experiment. During the last week of the
experiment, the instrument continued to collect coherent X-band data
and, when available, X-band uplink/Ka-band downlink data.

A sequence change request and Preliminary Sequence Integration and
Validation approval meeting was held as part of the sequence generation
process for C42.

The C43 sequence generation process began with stripped sequence files
distributed to the participating teams and a kick-off meeting. The
Sub-Sequence Generation waiver disposition meeting for this process was
cancelled, as there were no waivers to disposition.

The first tour aftermarket process began with an assessment meeting for
the S01 sequence. All required and proposed additional changes to the
sequence were scoped and a recommendation made to accept them pending
further analysis.

The science operations plan implementation process concluded for the
tour S05 and S06 sequences. Products from this activity have been
archived and will be activated again in July of 2004 for the start of
the S05 aftermarket process.

A kickoff meeting was held for the science operations plan
implementation process for tour sequences S21 and S22.

VIMS personnel completed ground regression testing of instrument flight
software version 8.1. The software was delivered to the project
software library and the Software Description Document was delivered to
the Cassini electronic library.

Multi-Mission Image Processing Laboratory software D31 development cycle
ended with delivery-to-test made this week. Numerous updates were made
to uplink and downlink software. The software set will become
operational in February.

Cassini Configuration Management received a delivery of the ISS Science
Team planning software, ISS Pointing Tool. This software is for use in
Support Imaging planning.

Cassini is a cooperative project of NASA, the European Space Agency and
the Italian Space Agency. The Jet Propulsion Laboratory, a division of
the California Institute of Technology in Pasadena, Calif., manages the
Cassini mission for NASA’s Office of Space Science, Washington, D.C.

Cassini Outreach
Cassini Mission to Saturn and Titan
Jet Propulsion Laboratory
California Institute of Technology
National Aeronautics and Space Administration

SpaceRef staff editor.