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Cassini Update
Cassini Update
25 May 2001
(Source: Jet Propulsion Laboratory)

Cassini Weekly Significant Events for 05/17/01 - 05/23/01

The most recent spacecraft telemetry was acquired from the Goldstone tracking station on Sunday May 20. The Cassini spacecraft is in an excellent state of health and is operating normally. Safing recovery procedures concluded this week, with all the instruments successfully turned on and the C26 sequence restarted early May 24. Information on the spacecraft's position and speed can be viewed on the "Present Position" web page at ("") .

The C27 Sequence Virtual Team held the Subsequence Generation/Sequence Change Request Approval Meeting.

The Huygens Recovery Task Force (HRTF) held its fifth meeting this week, with the Cassini Program hosting the meeting in the Pasadena area. For the first time, members of the Cassini orbiter science team were present along with the Huygens science team and the HRTF. The orbiter instruments were well represented and several interdisciplinary scientists were also present. The HRTF used the opportunity to brief the orbiter scientists on the various recovery options, their potential for science return and their potential impact on the Cassini/Huygens mission. The Huygens science teams presented the results of their analysis of the various data return scenarios and the effect the scenarios would have on the goals for the probe experiments. Both the low altitude and high altitude scenarios were further refined and actions were assigned for follow-on studies. The next meeting will be at European Space Research & Technology Centre (ESTEC) in Noordwijk, Holland at the end of the month.

As part of the ongoing web consolidation effort, a new internal Cassini web portal has been established. Significant improvements have been made in the format and layout of the information. However, the portal is not meant to be static, and Cassini users have been encouraged to supply feedback so that the system can continue to evolve to meet the needs of the project.

Per schedule, the Attitude Control Flight Software Development team delivered version A8.3.0 of the Attitude and Articulation Control Subsystem (AACS) Flight Software (FSW) to the Integrated Test Lab for further test. This is the last scheduled delivery for the AACS FSW prior to the soft freeze scheduled for July.

Mission Assurance has refined and updated the Program's Anomaly Reporting Plan. The revised plan and process were presented to the Cassini Design Team (CDT) for review and approval. Changes to the existing Incident, Surprise, and Anomaly (ISA) form were also discussed. An agreed upon list of changes will be forwarded to the JPL Problem Reporting System group for assessment and implementation.

A prototype web interface to the Event (E) Kernels was demonstrated at the EKernel Working Group. Positive feedback from users has been received regarding the usefulness of the tool.

Revision G of the Anomaly Response Plan was released for review this week. Modifications include desirable changes identified during the Jupiter sub-phase.

Cassini's Distributed Object Manager (DOM) system has proposed to migrate their data to an alternate underlying distributed file system. The Mission Support & Services Office (MSSO) and System Engineering (SE) teams have begun work with the Telecommunications and Mission Operations Directorate (TMOD)/Deep Space Mission Systems (DSMS) to determine the best solution and review impacts to the Cassini ground system.

Mission Assurance conducted the first Cassini Risk Team meeting this week to begin evaluating and converging on the Significant Risk List (SRL). The forum provided a chance for free exchange of information concerning potential risks to the Mission as well as consensus on the risks, their ratings and mitigation efforts. Time only allowed for half of the items on the SRL to be covered, so a follow-on meeting will be conducted to finish this activity. Once completed, the agreed to SRL will be placed into the on-line Risk Management Tool for tracking, continuous assessment and reporting purposes.

The Instrument Operations (IO) Visual and Infrared Mapping Spectrometer (VIMS) personnel attended the VIMS science team meeting in Tucson, which included discussions of calibration, flight rules, interface issues, planning tools and tour planning.

IO hosted a representative from Probe Operations for a week of Project training. Classes included a Security Briefing and Voice Net Operations taught by MSSO; Spacecraft, Planet, Instruments, C-matrix, and Events kernels (SPICE) overview by Navigation Ancillary Information Facility (NAIF) personnel; Cassini Information Management System (CIMS) and a Sequence Virtual Team (SVT) Overview given by Uplink Operations (ULO); Multimission Ground Data System (MGDS) by TMOD; and Problem Reporting and Anomaly Response taught by SE. The SVT overview was videotaped in Von Karman Auditorium. Future distribution of this tape on an as needed basis will provide wider opportunities for training new project members.

On Saturday and Sunday 19-20 May, JPL sponsored the annual "Open House," with Cassini Outreach coordinating the Cassini team effort. This year, over 65,000 people from throughout Southern California attended the events. Over 50 educator product and program requests were submitted to Cassini Education Outreach on Saturday alone.

Two new 20-slide sets have been completed for the Cassini Mission. Sets are available to Project staff through the Cassini Outreach Office. Additional sets and non-Cassini staff can order sets through Finley-Holiday Films. The new sets are "Saturn System" (JPL-52) and "A Trip to Saturn" (JPL-126). The new slide sets will also be posted in the Gallery section of the Cassini web site. Additionally, the Cassini 1/37th paper scale model of the spacecraft is the featured resource on the Space Science Education Resource Directory located at:

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 Outreach
Cassini Mission to Saturn and Titan
Jet Propulsion Laboratory
California Institute of Technology
National Aeronautics and Space Administration

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Last Updated: 5 Jun 2001