9 Nov 2001
(Source: Jet Propulsion Laboratory)
Cassini Weekly Significant Events for 11/01/01 - 11/07/01
The most recent spacecraft telemetry was acquired from the Goldstone tracking station on Wednesday, November 7. 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/.
The C28 sequence has completed execution, and the C29 sequence was uplinked last week and began execution on Sunday November 4. Recent instrument activities include two Radio and Plasma Wave Science High Frequency Receiver calibrations, Imaging Science Subsystem (ISS) scattered light characterization and dark frame observations, a RADAR Periodic Instrument Maintenance activity, a Magnetospheric Imaging Instrument Ion and Neutral Camera collimator plate test, and the beginning of the Visual and Infrared Mapping Spectrometer (VIMS) radiator test. Engineering activities taking place onboard the spacecraft this week include a transition from Reaction Wheel Assembly (RWA) to Reaction Control Subsystem control, an RWA unload, and transition back to RWA control for the VIMS Radiator test.
The C30 sequence activity kicked off this week with the beginning of the Subsequence Generation Phase. This sequence is planned to have lower levels of activity, such that Cassini personnel can focus on tour planning. The C30 sequence is planned to contain an ISS mini-sequence with a VIMS ride-along, and a turn to point the Cosmic Dust Analyzer in the spacecraft ram direction to increase their science return.
The Instrument Operations (IO)/ISS team returned the Composite Infrared Spectrometer (CIRS) support images, dark frames, and scattered light test data. The support images were processed and have been sent to ISS and CIRS for analysis. The IO/ISS team continued its camera haze anomaly investigation based on the C28 decontamination results.
The Attitude Control Subsystem (ACS) Flight Software (FSW) team has delivered version A8.4.0 of ACS FSW to the test labs as scheduled. The version for the Flight Software Development System was also released. The team is exercising the standard test set on the new delivery, which closes seven flight software changes.
Mission Planning and the Spacecraft Operations Office completed a study of the Cassini hydrazine propellant budget, with results showing a margin of 60 kg of hydrazine at the end of the four-year nominal mission. Science Planning will reassess their propellant usage strategy in the coming months in light of this study.
The final report for the Titan Science Uplink Verification activity was published, and a full suite of Target Working Team meetings was held last week to continue with the integration of the tour.
Cassini Information Management System (CIMS) developers from Southwest Research Institute met with the Cassini Uplink Operations/ Mission Sequence Subsystem (MSS) and Science Planning representatives, and have agreed to plans for the next several deliveries of CIMS in support of the Science Operations Plan development. A discussion was held with Mission Support & Services Office (MSSO) representatives to review CIMS performance and compatibility issues with the MSSO proposed mid-tier architecture.
Cassini staff supported the NASA Quarterly Program Review, which was attended by personnel from NASA Headquarters and line management.
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