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Cassini Update
Cassini Update
12 Mar 2003
(Source: Jet Propulsion Laboratory)

Cassini Significant Events
for 03/06/03 - 03/12/03

The most recent spacecraft telemetry was acquired from the Canberra tracking station on Wednesday, March 12. 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.

Attitude Control Subsystem (ACS) Flight Software checkout continued this week with the following activities performed: inertial reference unit B checkout, memory readouts of both the prime and backup ACS flight computer, a dynamic constraint monitor table checkout, a geometric constraint monitor table checkout, star ID suspend demonstration with quiescent reaction wheel assembly, several high water mark clears, and fault protection log pointer resets. At the conclusion of activities, ACS status was nominal. Data acquired from the various tests continues to be analyzed.

Port three for Science Operations Plan (SOP) implementation for tour sequences S15/S16 occurred this week. Development for these sequences will conclude next week.

A subsequence generation sequence change request approval meeting was held for the C37 sequence.

The Navigation Ancillary Information Facility (NAIF) released its version N0055 Spacecraft, Planet, Instruments, C-matrix, and Events kernels (SPICE) toolkit. The toolkit will be delivered to the Project Software Library within two weeks. Installation of the executables on workstations will follow. This version includes two new C-wrapped routines, and a corrected routine to support EKernel production. It also clarifies Cassini-specific RA, DEC, and Twist as well as yaw, pitch, roll functions in the NAIF/SPICE documentation.

The Imaging Science Subsystem team has published an article in Science magazine entitled "Cassini Imaging of Jupiter's Atmosphere, Satellites, and Rings". The URL is

More information may be obtained at

QuickTime movies that illustrate Cassini's tour through the Saturnian system from the viewpoint of an observer sitting on the spacecraft are available at

Cassini project members participated in a Family Reading Night event at Verdugo Woodlands Elementary School in Glendale, California. Each reader gave two reading sessions. In addition, a tour of the solar system in slides was presented to the entire school.

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

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Last Updated: 20 Mar 2003