26 Oct 2001
(Source: Jet Propulsion Laboratory)
Cassini Weekly Significant Events for 10/18/01 - 10/24/01
The most recent spacecraft telemetry was acquired from the Madrid tracking station on Wednesday, October 24. 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, http://www.jpl.nasa.gov/cassini/english/where/.
Recent instrument activities include a Cosmic Dust Analyzer measurement of Jovian dust stream particles, the continuation of an eight-day decontamination sequence for the Imaging Science Subsystem, and two Radio and Plasma Wave Science High Frequency Receiver calibrations. Engineering activities taking place onboard the spacecraft this week include the conclusion of the final in a series of Attitude Control Subsystem deadband tests. A minisequence was uplinked to overlay the Attitude Control Subsystem (ACS) Momentum Bias commands from the background sequence with new updated values produced by the ACS team.
C29 Preliminary Sequence Integration and Validation (PSIV) phase has continued with the release of version "C" sequence products to be reviewed during the upcoming PSIV approval meeting. All required waivers for the sequence have been reviewed and signed off, and three minisequences have been generated to support the fourth Probe Relay Test, which is planned for C29. These minisequences are currently being validated using the High Speed Simulator, and will require a final SIV phase with the release of version "D" products to accommodate several minor changes to the sequence.
The Solid State Recorder (SSR) Management Operations Concept was reviewed, with particular attention paid to the plan for multiple play-backs of certain science data from the SSR to the DSN, and data carry-over on the SSR from one play-back to the next. These items are being carefully reviewed due to their impact on the design of the SSR Management Tool and the planning of tour science observations.
The Cassini Functional Design Description document has been updated to include the comments made at the Ground Data System (GDS) and Downlink Critical Design Reviews earlier this year. Changes included revised diagrams of the GDS and updated requirements to the GDS and Downlink Operations Concepts.
The Uplink Operations and System Engineering teams held a Delivery Coordination Meeting for the Cassini Information Management System (CIMS) version 1.4.1 This latest release includes added functionality to the time-ordered-listing algorithm, which outputs science planning data from the CIMS database.
The Cassini Education and Public Outreach planning committee held a teleconference with its outside planning partners to present the draft Education and Outreach plan for review. In addition, Outreach held workshops to present classroom activities at the western regional National Science Teachers Association meeting in Salt Lake City and at the California Science Teachers Association meeting.
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 Mission to Saturn and Titan
Jet Propulsion Laboratory
California Institute of Technology
National Aeronautics and Space Administration