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Cassini Update
Cassini Update
5 Oct 2001
(Source: Jet Propulsion Laboratory)

Cassini Weekly Significant Events for 09/27/01 - 10/03/01

The most recent spacecraft telemetry was acquired from the Goldstone tracking station on Saturday, September 29. 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,

Recent instrument activities include a Radio and Plasma Wave Science High Frequency Receiver calibration, and the second in a series of Cosmic Dust Analyzer noise evaluations. Engineering activities taking place onboard the spacecraft this week included further Attitude Control Subsystem deadband testing, which will provide more data for a trade study on hydrazine consumption for two different Reaction Control Subsystem deadband settings.

The Cassini program hosted the kickoff meeting of the Huygens Mission Recovery Team on September 27-28. This meeting begins the second phase of the recovery effort wherein the results of the Huygens Recovery Task Force are implemented along with the accompanying detailed analyses. The team allocated the remaining work to the supporting technical sites and developed a schedule for the effort. One outcome of the work plan is the long-term collocation of several Huygens personnel at JPL. This will considerably increase the efficiency of the iterative work between the two programs. The next meeting will be held at JPL in December.

The Project Briefing for the C30 Science Planning Team sequence product was held this week, and the sequence was approved for implementation. Due to the high workload of supporting the various tour planning activities, this cruise sequence was constrained not to have any observations which require turning the spacecraft, greatly simplifying implementation.

The Visual and Infrared Mapping Spectrometer (VIMS) teams analysis of the C28 timing test data shows that the new VIMS Flight Software Version 4.2 is performing as expected.

A workshop was held this week to train Cassini Project members in the use of the Pointing Design Tool (PDT) and Science Opportunity Analyzer (SOA) software sets. Forty individuals from six different countries were on hand for this five-day workshop, including personnel from ten Instrument Teams, the Huygens Probe, Science Planning and the Spacecraft Operations Office (SCO). Developed by JPL Deep Space Mission Services in conjunction with Cassini Uplink Operations (ULO), SOA allows investigators to perform high-level science planning and identify key opportunities to perform science observations. PDT is being developed by ULO and is used to design detailed observations. When used in operations, this software outputs files that are incorporated into the sequences to be flown aboard the spacecraft.

The SCO delivered Version 7.0 of the Cassini Spacecraft Analysis System. This version contains significant upgrades to the Kinematic Prediction Tool/ Inertial Vector Propagator software, which will support the Science Operations Plan (SOP) development.

Mission Sequence Subsystem (MSS) has held several meetings to define the MSS D8 delivery scope. Participation by Science, Science Planning, System Engineering and Coordination, and SCO personnel have helped significantly in refining the target capabilities the MSS implement to support the SOP effort.

Mission Assurance has reviewed the JPL Design Principles with respect to Cassini Mission Operations and Data Analysis (MO&DA). A matrix has been produced that documents which principles apply to MO&DA and of these whether Cassini is compliant or non-compliant. The matrix has been reviewed by the SCO and will be released to the Cassini Electronic Library shortly.

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
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Last Updated: 10 Oct 2001