9 Jul 2001
(Source: Jet Propulsion Laboratory)
Cassini Weekly Significant Events for 06/27/01 - 07/04/01
The most recent spacecraft telemetry was acquired from the Goldstone tracking station on Wednesday, July 4. 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 spacecraft activities included two Radio and Plasma Wave Science (RPWS) high frequency receiver calibrations, two Magnetospheric Imaging Instrument (MIMI) Low Energy Magnetospheric Measurement Subsystem (LEMMS) exercises, a high water mark clear, and Imaging Science Subsystem (ISS) photometric calibration and dark frame imaging activities. The Visual and Infrared Mapping Spectrometer (VIMS) supplemental heater was also powered on via real-time command to maintain the needed thermal conditions for the instrument.
A slow time memory readout of the Reaction Wheel Assembly (RWA) and a RWA Friction Test were performed. The Friction Test is a periodic test that measures the performance of each of the four reaction wheels and checks for any abnormal wear. The Attitude and Articulation Control Subsystem team is still performing detailed analysis of the test results, however preliminary analysis indicate that all four wheels continue to operate normally.
Final sequence products for the C27 sequence were compiled, released, and approved for uplink. The sequence was then successfully uplinked to the spacecraft and verified to be active, with the sequence scheduled to begin execution in the coming week.
The Instrument Operations / VIMS team conducted Integration Test Laboratory (ITL) testing of the new VIMS flight software. Once the data are retrieved from ITL data analysis will begin. This analysis includes check out of the ground software's ability to process the data collected as output from the test of the new flight software.
The Radio Science Team held their post-Project Science Group meeting in Oxford England.
Multi Mission Image Processing Laboratory (MIPL) is developing a new, web-based, realtime telemetry processing system to support ISS and VIMS data processing during Tour. MIPL held a two-day peer review that included, on the second day, a series of demonstrations of the new capabilities.
The Mission Planning analysis of Titan flyby minimum altitudes was presented at the Mission Planning Forum, with the group assigning action items and identifying next steps in preparing for Titan flybys.
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