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



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
http://saturn.jpl.nasa.gov/operations/present-position.cfm .

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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