Significant Event Report for Week Ending 7/13/2001

Cassini Significant Event Report

For Week Ending 07/13/01

The most recent spacecraft telemetry was acquired from the Goldstone
tracking station on Monday, July 9. 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.

The C27 sequence was uplinked to the spacecraft and began executing this
week. Final activities in C26 included a RADAR calibration activity, an
AACS reaction wheel unload, and a constraint monitor update. The RADAR
activity was completed without incident and matched the results predicted
by Integration Test Laboratory (ITL) testing. Initial activities in C27
included power-on of the Composite Infrared Spectrometer (CIRS), loading
of Instrument Expanded Blocks for Cassini Plasma Spectrometer (CAPS),
Ultraviolet Imaging Spectrometer (UVIS), Radio and Plasma Wave Science
(RPWS) and Imaging Science Subsystem (ISS), an RPWS High Frequency
Receiver Calibration, an AACS reaction wheel friction test, and clearing
of the AACS high water marks. Observations included a Visual and Infrared
Mapping Spectrometer (VIMS) Fomalhaut Observation following their Solar
Port Calibration, a UVIS Interplanetary hydrogen survey, and CIRS
observations of Eta Carinae and VY-Canis Majoris.

Radio Science team personnel met in Rome with a group of engineers from
Alenia and a representative from the Italian Space Agency. Discussions
centered on the status of the KAT (Ka-Band Translator) anomaly
investigation.

ISS conducted an ITL test of various reset modes and Bus Interface Unit
conditions to better understand the interaction of instrument flight
software and camera operations. Analysis is underway.

Mission Assurance submitted an Abstract for a Risk Management Session at
the 2002 meeting of the IEEE. The paper entitled: "Managing Risk During
Cassini Mission Operations & Data Analysis" would document the Cassini
approach to Risk Management during mission operations, including the use
of an on-line risk tracking system and automated metrics generation.

VIMS Flight Software version 4.1 was received by Configuration Management
and archived in the Project Software Library.

A Delivery Coordination Meeting was held for CIMS version 1.2. This
version of CIMS provided a bulk data import capability (using data
formatted with XML).¿

A June 2001 update of the Integrated Mission Operations Schedule was
published to the Cassini Electronic Library (CEL)/Work Area. The
schedule now covers the period from Launch through April 2005 and includes
sequence development, execution and activities for the first nine tour
sequences. Hardcopy distribution at JPL and Distributed Ops sites has
begun.

The Native file for Anomaly Response Operations Plan Rev G has been posted
to the CEL and the Master Controlled Document List. The Cassini Duty
roster for C27 has been updated to reflect changes in the G version.

Additional information about Cassini-Huygens is online at http://saturn.jpl.nasa.gov.

Cassini will begin orbiting Saturn on July 1, 2004, and release its piggybacked Huygens probe about six months later for descent through the thick atmosphere of the moon Titan. Cassini-Huygens is a cooperative mission of NASA, the European Space Agency and the Italian Space Agency. JPL, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Office of Space Science, Washington, D.C.

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