Cassini Significant Event Report

For Week Ending 08/07/98

Spacecraft Status:


The most recent Spacecraft status is from the DSN tracking pass on Thursday, 08/06, over Madrid. The
Cassini spacecraft is in an excellent state of health and is executing the C9 sequence nominally. The speed of the spacecraft can be viewed on the "Where is Cassini Now?" web page (http://saturn.jpl.nasa.gov/operations/present-position.cfm)


Spacecraft Activity Summary:


On Friday, 7/31, several bus heaters were turned off as their heat was no longer needed.


Also on Friday, several address ranges were changed in the AACS trickle Memory Readouts (MROs),
allowing certain AACS telemetry channels to be collected on the ground whenever Cassini has a scheduled
DSN telemetry pass. This address update will allow future cancellation of specially scheduled AACS Attitude
Estimator (ATE) MROs.


On Wednesday, 08/05, maintenance was performed on the SSR Flight Software Partitions. This activity,
performed approximately every 2 weeks, repairs any SSR double bit errors (DBEs) which have occurred in
the code-containing portions of the Flight Software partitions during the preceding period.


Also on Wednesday, the Solid State Recorder (SSR) record and playback pointers were reset. This
housekeeping activity, done approximately weekly, maximizes the amount of time that recorded engineering
data is available for playback to the ground should an anomaly occur on the spacecraft.


Upcoming events:


Activities scheduled for the week of 08/07 - 08/13 include: SSR Pointer Reset (8/12), and store
RTE158-enable and ATC6 parameter-update software on SSR (8/12) (rescheduled from 8/1).



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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