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Cassini Update
Cassini Update
15 Jun 2001
(Source: Jet Propulsion Laboratory)

Cassini Weekly Significant Events for 06/07/01 - 06/13/01

The most recent spacecraft telemetry was acquired from the Goldstone tracking station on Tuesday, June 12. 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 at ("http://www.jpl.nasa.gov/cassini/english/where/").

The Visual and Infrared Mapping Spectrometer (VIMS) team successfully completed four tests of modified flight software (FSW) on the instrument testbed using the VIMS Ground Support Equipment. Commands from the four tests were translated into a single set of commands for testing in the Integration and Test Laboratory (ITL). That testing exercised 73 combinations of parameters while doing regression and new capability testing. Results were posted on the Telemetry Delivery System for use by Multimission Image Processing Laboratory (MIPL) during their testing of VIMS Ground Software in MIPL. Those results are under analysis.

An Imaging Science Subsystem (ISS) flight software glitch related to the numbering of Instrument Expanded Blocks led to powering down the instrument as a precautionary measure. A patch will be uploaded as part of a planned mini-sequence next week.

The ISS team completed analysis of ITL tests with the ISS engineering models to verify documented IEB load sizes and other behavior. The results will be influence the current FSW upgrades and will aid in documenting the ISS response to certain conditions. Modifications and tests of the new ISS flight software continue on the IO instrument testbed.

The Sequence Team held both a simulation coordination meeting and simulation walk-through in support of ITL testing for C27, and the tests executed successfully later in the week. There was also a preliminary Sequence Change Request approval meeting in support of the C27 Preliminary Sequence Integration and Validation phase.

An Atmospheres Working Group teleconference was held to discuss the possible trajectory changes proposed by the Huygens Recovery Task Force. An Apoapsis Splinter Group teleconference was held to work the integration issues associated with the apoapsis periods in the Tour.

System Engineering (SE) distributed the Verification and Validation plan for review pending signature.

The Mission Planning Team delivered the Mission Plan, Rev. M, to the Cassini Electronic Library, and reviewed trade studies across all Cassini elements in the Mission Planning forum to organize, prioritize and assign responsibility for those studies to the appropriate element.

Cassini Uplink Operations supported the X2000/Advanced Technology and Autonomy for the Future program, providing a large test file for testing of a new "smart" board X2000 is testing for onboard processing or routing of command files. X200 needed a file with a large number of Command Link Transmission Units to check performance, which Cassini was able to supply.

Mission Support & Services Office (MSSO) is working with Cassini Security, JPL Security, and Building 230 Management in developing a Remedy-based tool for Space Flight Operations Facility (SFOF) access status. MSSO is collecting information and requirements from Building 230 Management and will do the same with JPL Security at a later date. Cassini benefits from participating in this activity by helping to define and understand the rules and requirements for SFOS access with the goal of minimizing building access delays and improve physical security monitoring.

MSSO ACE command procedure has been updated to reflect the Program's dependence upon institutionally-provided AFS servers. This update includes an advisory message for users of the system.

The SE team presented the Ground System software inventory and classification status at the Cassini Design Team meeting. All the Ground System software classifications have been reviewed, with the majority of the program classifications accepted and further discussion planned for the few remaining programs. The required types of documentation for each classification level was discussed, and initial coordination made for reviewing the documentation for each program.

Outreach personnel represented Cassini at a workshop in Charleston, South Carolina that focused on the use of existing and future NASA materials in classrooms for the visually and hearing impaired. Cassini Outreach also spoke to 225 students, teachers, and parents participating in the U. S. Aerospace Challenge rocketry competition in Holland, Michigan.

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: 18 Jun 2001