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Significant Event Report for Week Ending 1/11/2002

Significant Event Report for Week Ending 1/11/2002

Jan. 11, 2002


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Cassini Significant Event Report
For Week Ending 01/11/02

The most recent spacecraft telemetry was acquired from the Goldstone
tracking station on Wednesday,
January 9. The Cassini spacecraft is in an excellent state of health and
is operating normally. Information on the spacecraft's position and speed can be viewed on the "Present Position" web page.

Execution of C29 continues to proceed normally. Cassini's Gravitational Wave
Experiment (GWE) completed on Jan 5. The Radio Science team was very pleased
with the effort, reporting they collected over 90% of the possible Ka-Band GWE
data. At the completion of the GWE, instruments that were quiet due to the
experiment resumed normal operations. Additional instrument activities include
Radio and Plasma Wave Science Periodic Instrument Maintenance, write protect bit
clear, and two High Frequency Receiver calibrations. The Ultraviolet Imaging
Spectrometer (UVIS) completed an observation of Alpha CMA. Commands to activate
Latchup detection algorithm and thresholds for the Cosmic Dust Analyzer, and
Command & Data Subsystem Enable CDA fault protection were successfully
uplinked and executed.

Engineering activities this week included transition to the Reaction Control
Subsystem following 40 days on wheels to support the GWE, a Reaction Wheel
Assembly bias unload and readout of parameters, an Attitude Control Subsystem
high-water mark clear, and an autonomous Command & Data Subsystem Solid
State Recorder memory load partition repair.

The Sequence Team held a Final Sequence Integration and Validation meeting
for C30. The sequence has been approved for uplink along with the Imaging
Science Subsystem decontamination and Composite Infrared Spectrometer functional
test mini-sequences. All files will be sent to the spacecraft next week.

Science Planning reported completion of Satellite Orbiter Science Team (SOST)/
Science Uplink Verification (SUPV) activities. Within the next two weeks a
package will be produced documenting results and lessons learned. In addition,
the Science Planning Virtual Team kicked off development of the C32 sequence.
Tour phase mission risks that require a rapid response and that currently need
development work was the topic at this week's Mission Planning Forum. At the
Cassini Design Team meeting, presentations included the development schedule and
System Overview presentation package for the Uplink Critical Design Review to be
held in February, and the Instrument Expanded Block strategy operations concept

A suite of Cassini training classes has been scheduled for next week to coincide
with the Program Science Group meeting to be held at JPL.

Mission Sequence Subsystem version D7.7 has been installed on all online Science
Operations and Planning Computers.

Cassini Outreach met this week to discuss completion of the Cassini Replan and
timelines.

Additional information about Cassini-Huygens is online at http://saturn.jpl.nasa.gov.

Cassini will begin orbiting Saturn on July 1, 2004, and release its piggybacked Huygens probe about six months later for descent through the thick atmosphere of the moon Titan. Cassini-Huygens is a cooperative mission of NASA, the European Space Agency and the Italian Space Agency. JPL, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Office of Space Science, Washington, D.C.

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