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Cassini Update
Cassini Update
1 Jun 2001
(Source: Jet Propulsion Laboratory)

Cassini Weekly Significant Events for 05/24/01 - 05/31/01

The most recent spacecraft telemetry was acquired from the Goldstone tracking station Tuesday May 29. 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 at ("").

Recent spacecraft activities included a Radio and Plasma Wave Science (RPWS) High Frequency Receiver (HFR) calibration, a high water mark clear, and an Attitude and Articulation Control Subsystem (AACS) Reaction Wheel Assembly (RWA) Slow Time Memory Readout. The D7.4 modules file was successfully uplinked to the spacecraft with confirmation that all four module programs registered as expected. Periodic Instrument Maintenance (PIM) operations were performed for the Ultraviolet Imaging Spectrograph (UVIS), Imaging Science Subsystem (ISS), Composite Infrared Spectrometer (CIRS), Visual and Infrared Mapping Spectrometer (VIMS), and RADAR instruments, with initial indications showing nominal execution. ISS performed both a photometric calibration and a dark frames activity. Additionally, AACS performed a Reaction Control Subsystem (RCS) Catbed Heater test to verify an AACS thermal heating model. Initial results show good agreement.

The Radio Science (RS) Ka-Band Translator (KaT) was powered-on for Solar Conjunction Experiment (SCE) testing, after having been off since the first Gravitational Wave Experiment (GWE) system test completed earlier this month. While previous testing had developed a successful procedure to achieve and maintain the KaT at a good operating state, telemetry during recent activities with the KaT and S-Band Translator (SBT) on simultaneously showed that the KaT was not operating properly with the SBT powered-on. The KaT was power-cycled according to the new procedure but still failed to operate properly. The RS team powered off the SBT and then allowed the Radio Frequency Instrument Subsystem bay to reach a stable thermal point. The KaT was power-cycled again, after which it attained a good operating state. The KaT will remain powered-on for the duration of the SCE testing, and the KaT behavior studied further.

The Sequence Virtual Team (SVT) completed the Subsequence Generation Phase for C27 Sequence development with all instrument teams and engineering subsystems delivering their populated command subsequences. The SVT has begun the Preliminary Sequence Integration and Validation phase for C27 Sequence development, and released the integrated sequence late this week.

The Mission Support & Services Office (MSSO) Verification and Validation (V&V) test network is up and running.

A "Cassini Export Compliance and Security Requirements" meeting was held. This meeting was co-produced by the Office of Legislative and International Affairs and MSSO/Computer Security. The primary objective of the meeting was to explain the current U.S. Export rules, regulations, and security requirements including International Traffic in Arms Regulation (ITAR) and Export Administration Regulations (EAR), and how those regulations affect the Cassini Flight Team specifically and JPL employees, US nationals, and foreign nationals in general.

The Project Science Group (PSG) meeting agenda was released for the upcoming meeting to be held in Oxford, England late June.

The Uplink Operations (ULO) team distributed MSS D7.6 Module Functionality Review materials in support of a pending review. ULO also presented a proposal for the first delivery of the Solid State Recorder (SSR) Management Tool (SMT), which includes a summary of initial requirements to be met and capabilities to be provided by the SMT.

System Engineering (SE) held a preliminary Delivery Coordination Meeting (DCM) to ensure that the ULO/MSS delivery of the Science Opportunity Analyzer tool is ready to be installed on the OPSNET and on the Science Operations and Planning Computers (SOPCs). Issues regarding ITAR, testing and configuration were discussed; everything was found to be in order and the final DCM is scheduled for later this week.

SE also signed three Software Interface Specifications (SISs) to support the Maneuver Automation Tool. While each SIS had already existed, some minor modifications and additions were required.

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.

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Last Updated: 5 Jun 2001