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Cassini Update
Cassini Update
25 Feb 2004
(Source: Jet Propulsion Laboratory)

Cassini Significant Events for 02/19/04 - 02/25/04

The most recent spacecraft telemetry was acquired from the Goldstone tracking station on Tuesday, February 17. 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 .

C42 successfully completed execution and deregistered on-board the spacecraft. Final activities included a Magnetospheric Imaging Instrument flight software RAM 36-minute spin patch, a memory read out of the Radio and Plasma Wave Science RTI loss counter, and a reaction wheel bias activity. A total of 809 ISS images and 498 VIMS cubes were returned by the C42 sequence.

C43 began execution with initialization and Instrument Expanded Blocks (IEB) loads for the instruments. Additional activities included checkout of the most recent version of Cosmic Dust Analyzer instrument flight software, uplink of Cassini Plasma Spectrometer power cycle reset and flight software IEB reload mini-sequence, the start of RADAR power-on and Remote Engineering Unit rerouting, optical navigation image acquisition, Ion and Neutral Mass Spectrometer load of build 2 flight software into RAM, and a number of high water mark clear commands.

Cassini continued obtaining data for Saturn approach movies to study the planet's atmosphere and its temporal variations, determine wind speeds and cloud properties, and to build up global temperature and composition maps. Mapping of Saturn's magnetosphere in the ultraviolet also continues. One goal of this activity is to obtain enough data to create a 3-dimensional map of the distribution of atomic hydrogen. Cassini continues to monitor the solar wind as it approaches Saturn, including looking for upstream ions and upstream wave phenomena.

The final timeline to illustrate Spacecraft Operations Office (SCO) and Science activities during the C44 ACS flight software update real time command window beginning April 26 was presented to the C44 Sequence Team. It was decided that all targeted science observations during this window would be removed from the background sequence and sent to the spacecraft via mini-sequences following ACS real-time activities for the given day. This is to ensure a nominal background state for the science instruments without using consumables. ACS will also be responsible for ensuring their update activities are consistent with expected spacecraft states.

Official port#1 occurred this week for the Science Operations Plan update of S01, the first tour sequence. The Spacecraft Activity Sequence Files were merged and delivered to ACS for the end-to-end pointing validation. The Assessment meeting was held for the S03 Aftermarket process to scope out the list of proposed changes to the sequence. The number of requested changes was well within scope and the Target Working Teams were asked to evaluate the requested changes over the next two weeks.

Delivery coordination meetings were held for the Reaction Wheel Bias Optimization Tool 2.0, Telemetry Forecaster Predictor 3.3, and for the multi-mission Navigation tool set version T1.1

Mission Support & Services Office, SCO, Instrument Operations, and Huygens teams have been preparing for next week's Probe Relay demonstration. The Cassini ACE will continue to support all real-time activities during this event. System Administration, the Cassini internal help desk, and Infrastructure support will be staffed for critical support beginning March 3 at midnight through March 4. Presentations on Cassini were given by Outreach personnel at the Children's Creative Workshop in Malibu, California and at Castaic Elementary School in Castaic, California.

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: 1 Mar 2004