23 Mar 2001
(Source: Jet Propulsion Laboratory)
Cassini Weekly Significant Events for 03/15/00 - 03/21/01
The most recent spacecraft telemetry was acquired from the Canberra tracking station on Wednesday, March 21. The Cassini spacecraft is in an excellent state of health and is operating normally. The speed of the spacecraft can be viewed on the "Present Position" web page:
Post Jupiter science operations concluded this week with the spacecraft alternating between Optical Remote Sensing (ORS) and Magnetospheric Imaging Instrument (MIMI) data collection. Additional activities included Periodic Engineering Maintenance, Reaction Wheel Assembly (RWA) Slow Time Memory Readout, uplink and execution of the RWA bias overlay and an RWA unload, CDS-A and CDS-B automatic SSR repairs, and a Radio Science Subsystem (RSS) Ultra-Stable Oscillator (USO) characterization. The USO characterization was performed successfully over the Goldstone complex with data recorded on both the DSP-R (DSCC Spectrum Processor, Radio Science) at X-band, and the RSR at both X-band and Ka-band.
The Cassini Instrument Operations (IO) Team and the Multi Mission Image Processing Laboratory (MIPL) have produced and delivered 26,502 ISS images - 18,904 from the NAC and 7,221 from the WAC - and 5,079 Visual and Infrared Mapping Spectrometer (VIMS) cubes since Jupiter observations began.
In preparation for the Gravitational Wave Experiment (GWE) system test to be performed beginning in May, the new Multi-Mission Radio Science Telemetry Delivery System (TDS) was installed this week with the related GIF (Ground Data System Interface), TIS (Telemetry Input System), also installed. RSR (Radio Science Receiver) SFDUs (Standard Format Data Unit) were transmitted from the Signal Processing Center at Goldstone, California, received on the RSS TDS, and read by the Radio Science Team. This data flow test is an initial validation of the RSR data formats to be used in the GWE system test and GWE.
Mission Planning personnel completed development of strawman load boundaries for all of the Approach Science subphase and Tour. This design will be presented at an upcoming Mission Planning forum.
Uplink Office personnel hosted a Tools Workshop where the Cassini Information Management System (CIMS) and Science Opportunity Analyzer (SOA) were demonstrated. A hands-on opportunity with the software was provided to the participants and their feedback sought on future development of these tools.
Mission Support and Services Office (MSSO) personnel delivered the final "Jupiter Fly-by" network analysis report. This report will be used by Cassini's hardware infrastructure group to determine what type of network usage and attendant problems may be expected during tour.
The MSSO Infrastructure Team web pages have been redesigned, new graphics added and new task and service descriptions added. This new site will be uploaded and integrated with the Cassini "inside" web services next week.
A TOST meeting was held this week focusing on Optical Remote Sensing and addressing integration issues with the first 10 Titan flybys for the period within +/-1 day of closest approach. Significant progress was made on resolving conflicts and developing agreements for this period.
An all day workshop was held by the Science Planning Team on the topic of Science Planning requirements and design. The goals of the workshop included: 1) Review of the concepts and designs associated with the development of the Science Operations Plan (SOP), the Aftermarket Process, and the SOP Update Process, 2) Identification and review of the interface issues associated with the development of the SOP, and 3) Identification and review of the readiness requirements for the implementation of the SOP.
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