Cassini Significant Event Report

For Week Ending 12/18/98

Spacecraft Status:

The most recent spacecraft status is from the DSN tracking pass on
Thursday, 12/17, over the Goldstone tracking station. The Cassini
spacecraft is in an excellent state of health and is executing the Cruise
11 sequence normally. The Cassini spacecraft is presently traveling at a
speed of approximately 66,338 kilometers/hour relative to the sun and has
traveled approximately 1.079 billion kilometers since launch on
October 15, 1997.

Spacecraft Activity Summary:

On Friday, 12/11, the Solid State Recorder (SSR-B) record and playback
pointers were reset as planned.

On Sunday, 12/13, two planned of the three possible components of Periodic
Engineering Maintenance were performed. All activities were nominal;the
third component is planned for next week.

On Wednesday, 12/16, routine maintenance was performed on the Solid State
Recorder (SSR-B) flight software partitions.

On Thursday, 12/17, an Instrument Flight Software update was performed for
MIMI in preparation for Instrument Checkout.

Upcoming events:

Activities scheduled for the week of 12/18-12/24 include SSR Pointer
Reset, Periodic Engineering Maintenance (Reaction Wheel Portion), and
Instrument Flight Software update for CDA, CIRS and RPWS on 12/18, Probe
Checkout, SSR Pointer Resets, and Flight Software update for CAPS and INMS
on 12/21, and reset of the PSA (Probe Support Avionics) Prime status
following Probe Checkout on 12/22.

Additional information about Cassini-Huygens is online at

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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