From: Jet Propulsion Laboratory
Posted: Friday, October 11, 2002
The most recent spacecraft telemetry was acquired from the Goldstone tracking station on Wednesday, October 9. The Cassini spacecraft is in an excellent state of health and is operating normally. Information on the present position and speed of the Cassini spacecraft may be found on the "Present Position" web page located at http://saturn.jpl.nasa.gov/cassini/english/where/ .
This week the Composite InfraRed Spectrometer (CIRS) completed a three day activity to test the amount of heating caused by various amounts of sunlight on the CIRS radiator.
A Beta Gru observation was performed with the Visual and Infrared Mapping Spectrometer (VIMS) instrument prime, with CIRS and the Imaging Science Subsystem (ISS) riding along. The star Beta Gru is one of the stars that VIMS will lock on and track for ring particle occultation studies. Spectral characteristics and signal level will be recorded at several integration times in order to correctly set the real occultation observation instrument parameters. In addition, ISS and Ultraviolet Imaging Spectrograph instrument teams performed an observation of the White Dwarf HZ43.
VIMS also performed a Geometric Calibration with ISS riding along. The full 64 X 64 pixel VIMS field of view was used for the Geometric Calibration studies of the Pleiades star cluster. The acquired images are used to correct for optical distortion in the instrument, and to construct an algorithm to be applied to the images to geometrically correct the VIMS field of view. Quick look processing of the data from these observations has been completed. A preliminary analysis of the ISS images showed the haze anomaly has not returned.
Additional instrument activities included a RADAR Radiometric Calibration, Radio and Plasma Wave Science (RPWS) High Frequency Receiver Calibration and high rate cyclic, uplink of an RPWS flight software patch, and uplink of a Cassini Plasma Spectrometer Actuator command file.
Science Planning reported that the Science Planning Team (SPT) development process for C36 would be cancelled since this sequence is exclusively in support of the CDS/ACS flight software checkout period. During this time there are no planned science activities. The next SPT cruise development process is scheduled to start in December for C37.
The tour Science Operations Plan (SOP) implementation of sequences S13/S14 began this week. The process to be used has a shorter development schedule compared to S09/S10 and S11/S12. The development schedule is 60 workdays instead of the 72 workdays used for the previous development activities.
The Spacecraft Operations office held their Monthly Management Review for flight software and critical sequence development.
The Cassini Archive Coordinator and two Planetary Data System (PDS) node representatives visited the Southwest Research Institute in Boulder, Colorado to meet with the ISS Team Leader and staff. Discussions covered archiving and E-kernel requirements. The meetings were very successful. The ISS Team Leader now has an excellent understanding of the development needed to provide E-kernel inputs, and to produce a PDS archive.
Uplink Operations (ULO) distributed a proposal for how prime-rider instrument coordination might be facilitated in the Cassini Information Management System (CIMS). The proposal will be reviewed with the distributed science teams and other CIMS users at the CIMS Working Group meeting next week.
ULO also presented a proposal for Mission Sequence Subsystem (MSS) D9.0 and D9.0.1 delivery content at both the System Engineering Round Table and the Instrument Operations Working Group. D9.0.1 will include Science Opportunity Analyzer tool, items on the Pointing Design Tool requirements list, the suspend SID flight rule Engineering Change Request, targeting rocks, enhancements to ODD, and other miscellaneous fixes. Everything else currently scheduled for D9.0 will remain in D9.0, including the implementation of the new CIRS and VIMS flight rules in PDT. The proposal was accepted and is the new MSS baseline.
Coding and acceptance testing has been completed for MSS D8.0.4. The software has now moved on to system test. The Delivery Coordination Meeting is scheduled for the end of October.
Delivery coordination meetings (DCM) were held for Command Database V9a, and Cassini Operational Reference Encyclopedia (CORE) V3.0. The Command Database V9a is specifically to be used in the Integrated Test Laboratory for Probe relay critical sequence testing. V9b is to be delivered later this year for use with MSS D9.0. CORE V3.0 is the replacement of REALITY, a web-based tool to provide access to the command and telemetry dictionaries as well as the Flight Rule information.
RPWS delivered their flight software version 2.6 to the Project Software Library. A Software Requirements Certification Review and DCM will be held later in the month.
A draft schedule and list of attendees for 18 Cassini specific training classes was released this week. Classes are scheduled to coincide with the Project Science Group meetings later this month.
Mission Assurance participated in a joint JPL/Aerospace Corporation Risk Management Workshop. These are an on-going series of monthly workshops, being conducted to advance the practice of Risk Management. Discussion during this workshop centered on developing a storyboard for risk management and looking for common threads among implementers.
Cassini Outreach hosted an online training for 43 members of the Solar System Ambassador Program. The training focused on the Saturn Tour.
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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