8 Feb 2002
(Source: Jet Propulsion Laboratory)
Cassini Weekly Significant Events for 01/31/02 - 02/06/02
The most recent spacecraft telemetry was acquired from the Goldstone tracking station on Wednesday, February 6. The Cassini spacecraft is in an excellent state of health and is operating normally. "Present Position" web page, http://www.jpl.nasa.gov/cassini/english/where/.
The C30 sequence continues to execute as planned. Science activities include commanding for the Magnetometer Subsystem (MAG) to set the Vector Helium Magnetometers bit to OFF state, and the conclusion of the Imaging Science Subsystem (ISS) decontamination and Visual and Infrared Mapping Spectrometer Image/Occultation mini-sequences.
Preliminary results from the ISS decontamination mini-sequence show a significant improvement for the Narrow Angle Camera. The C30 decontamination cycle lasted approximately 7 1/2 days and reached about +4 degrees C. This was several degrees above the C28 cycle as the replacement heaters were also powered on. Final results should be available next week and will be followed by discussions of further decontamination activities.
Other spacecraft activities included clearing of the AACS high water marks, an autonomous Command & Data Subsystem Solid State Recorder Memory Load Partition repair, and an attitude control reaction wheel friction test. Results from the test were normal.
The C31 preliminary Sequence Integration & Validation (SI&V) products were released this week. Members of the Sequence Team reviewed the package and submitted desired Sequence Change Requests (SCR). The SCRs will be dispositioned in the C31 SI&V SCR approval meeting to be held next week.
Science Planning (SP) reported the publication of a final report for the Satellite Orbiter Science Team (SOST) Science Uplink Verification (SUPV) activity. SP activities included a full set of TWT meetings to continue the integration of the orbits associated with the next delivery milestone, which includes orbits 10 through 15, and a Titan Orbiter Science Team (TOST) meeting to refine the integration details associated with the recent T6/T7 trade.
The Spacecraft Office reported the Attitude Control flight software team delivered version 8.5.0. This is the first version containing the energy cutoff algorithm for the Saturn orbit insertion burn and will be used for system mode testing. In addition, the Attitude Control ground software developers delivered the preliminary set of target options to Spacecraft Operations and Uplink Operations for early test and evaluation. These comprise the full set of options for the Mission Sequence System D8 delivery.
The Cassini Program conducted a NASA Quarterly Review on Monday, February 4.
UVIS 1.3.0 instrument flight software was delivered to the Program Software Library. Significant progress has been made in the Risk Management area, following a Program wide review of the Significant Risk List. The overall risk posture of the Program has been reduced due to effective mitigation efforts. Redundancy in several risk statements has been eliminated to create a crisp list for Risk Management during Mission Operations.
A review and redesign of the proposed Telemetry Delivery System architecture for tour support has been implemented due to changing storage system costs, and lack of adequate existing expertise with complex storage array systems.
The Cassini-Huygens outreach and education website, currently hosted at: http://www.jpl.nasa.gov/cassini, has been relocated to a new, enhanced environment. In conjunction with the move a new domain name has been established for the Cassini-Huygens site. The new address is http://saturn.jpl.nasa.gov. This change will take effect on February 5, 2002.
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