SETI bioastro: Fw: Cassini Significant Events for 12/12/02 - 12/18/02

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Date: Fri Dec 20 2002 - 11:24:04 PST

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Sent: Friday, December 20, 2002 1:47 PM
To: Cassini Spacecraft Updates
Subject: Cassini Significant Events for 12/12/02 - 12/18/02

Cassini Significant Events
for 12/12/02 - 12/18/02

The most recent spacecraft telemetry was acquired from the Goldstone
tracking station on Wednesday, December 18. 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 Radio and Plasma Wave (RPWS) High
Frequency Receiver calibrations, an ACS High Water Mark clear, and
uplink of the RPWS looper program #2. The program will begin execution
at the beginning of next week.

Gravitational Wave Experiment #2 continues. Operations were normal from
Day of Year 343 through 347. Beginning DOY 348, the DSS-25 X-band
transmitter has been tripping off, resulting in loss of 2-way X-band and
Ka-band links. Mission Support and Services Office personnel are
working with the Deep Space Network to possibly add DSS-24 or DSS-26 in
parallel to the DSS-25 tracks to maintain the X-band uplink. Radio
Science continues to provide round-the-clock staffing for the GWE.

Processing of the data returned from Probe Relay test #5 is now
complete. Analysis continues.

The Command and Data System (CDS) Flight Software Team held a successful
Software Requirements and Certification Review for a five bit per second
telemetry mode patch to the CDS software. The patch is necessary to
properly configure the Version 7 CDS flight software prior to uplink of
the Version 9 CDS flight software which will begin in March, 2003. The
patch was delivered to the Project Software Library and will be uplinked
to the spacecraft in January, 2003. The end-to-end test of the
procedures for the Attitude Control System (ACS) FSW uplink and checkout
continues to run smoothly and is nearly complete. This is a major system
mode test of the all ACS activities during the FSW checkout period
beginning in mid-February. The Integrated Test Lab has been running
continuously in system mode for over nine days.

The Navigation team has documented the baseline maneuver strategy and
timeline for the Huygens mission. This timeline was recently approved
by Cassini and Huygens at the Quarterly Progress Meeting held at JPL on

The topic at this week's Mission Planning Forum centered on pointing
changes based on ephemeris updates during the tour. Navigation
discussed some software that has been developed to assess the pointing
changes in going from previous to new geometries.

All teams and offices presented at the December Cassini Monthly
Management Review.

The Cassini Navigation and Ancillary Information Facility staff met with
the Huygens Descent Trajectory Working Group to discuss how Spacecraft,
Planet, Instrument, C-matrix, and Events kernels will be deployed in
support of Huygens descent operations.

It was reported in NASA Science News for December 13, 2002 that on
December 17, Earth and Saturn had their closest encounter in nearly 30
years. Furthermore, the planet's rings are tipped toward Earth. It is
an unbeatable combination for sky watchers who can easily see Saturn's
rings using backyard telescopes or binoculars. For the full story
connect to

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

Visit the JPL Cassini home page for more information about the Cassini Project: <>

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