Cassini Significant Event Report
For Week Ending 09/04/98
The most recent Spacecraft status is from the DSN tracking pass on Wednesday, 09/02, over Goldstone. The Cassini spacecraft is
in an excellent state of health and is executing the C9 sequence nominally. The C9 sequence will complete on 9/13, at which point the
C10 sequence will begin. 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 Wednesday, 09/02, three activities took place. 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.
Secondly, a highwater mark maintenance activity was performed. This activity, scheduled approximately every two months over an
available command/telemetry pass, clears the AACS highwater mark telemetry channels. These channels track the extremes of
certain AACS values (hi or low) experienced since the last time the maintenance was performed.
Finally, 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.
Activities scheduled for the week of 09/04-09/10 include: Uplink of the Cruise 10 Sequence, (09/07) and SSR Pointer Reset
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.