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Cassini Significant Events for 02/12/04 - 02/18/04

Cassini Significant Events
for 02/12/04 - 02/18/04

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 .

Cassini continues to take data for the first color Saturn and ring approach
movies, ultraviolet mosaics of the Saturn magnetosphere, searches for
previously undetected satellites, and long integrations of Saturn's rings in
the mid-infrared to determine ring composition.

Additional activities include uplink of the second set of Ion and Neutral
Mass Spectrometer (INMS) diagnostic flight software, a Magnetometer
Subsystem (MAG) boom alignment and calibration, Radio and Plasma Wave
Science (RPWS) high frequency receiver calibrations, acquisition of optical
navigation images, power-off of the Cassini Plasma Spectrometer (CAPS) Ion
Mass Spectrometer sensor and power-on of the supplemental heater, clearing
of the ACS high water marks, and a DSN array demonstration.

Instrument Expanded Blocks for Visual and Infrared Mapping Spectrometer
(VIMS), CAPS, Imaging Science Subsystem (ISS), Ultraviolet Imaging
Spectrograph (UVIS), and Composite Infrared Spectrometer (CIRS) were
uplinked to the spacecraft along with the C43 background sequence and a CIRS
Mission Sequence Subsystem version D10.1 trigger mini-sequence.  C43, the
second of the approach science sequences, begins execution on Thursday
February 19.

A science allocation planning meeting for development of C44 was held this
week.  There were four days and almost 3000 MB of additional data bits
available to be shared by CAPS, Cosmic Dust Analyzer, CIRS, MAG,
Magnetospheric Imaging Instrument, RPWS, and VIMS.

Radio Science Gravitational Wave Experiment #1 data archive volume for the
Planetary Data System has been distributed to the Radio Science Team for
review.  This volume will be used as a template for future radio science
archive volumes.

In the last week, 331 ISS images were returned and distributed.  So far in
C42, 540 ISS images, 52 of them optical navigation images, have been
returned.  In the last week, 46 VIMS cubes were played back and distributed.
So far in C42, 416 VIMS cubes have been received.

The Kinematic Prediction Tool / Inertial Vector Propagator analysis on the
port #1 products for tour sequences S23 and S24 were delivered this week.
In addition, the development process for Science Operations Plan
implementation of S25 and S26 kicked off.

The preliminary port#1 of the Aftermarket process for tour sequence S01
occurred this week.

Mission Planning reported that the INMS team has begun simulating Titan A
data and using a JPL generated trajectory in support of an exercise to train
for estimating the actual Titan atmosphere during the Ta flyby in support of
navigation planning for subsequent flybys.  The activity will run for about
two weeks.  During this exercise, the existing atmosphere model will be
modified, the trajectory used, and data to be gathered by INMS during the Ta
flyby will be emulated.  Then another INMS team will take the simulated data
and translate it into an atmosphere model which can be extrapolated to 950
km.  This is test #2 of this process.  The first test uncovered some
problems with the process that have since been corrected.

A delivery coordination meeting was held for Multi-mission Image Processing
Laboratory software version D31.  An additional delivery will be held for
version D32.01 in late March to include updates for a VIMS modification and
a telemetry processing option.

A Software Review/Certification Requirements meeting was held for INMS
flight software (FSW) version 7.0   The software will be uplinked to the SSR
and then to INMS RAM during C44. This is a fully functional FSW build and
not part of the diagnostic FSW builds currently operating on the instrument.

Articles posted to the University of Arizona Science and Technology website,
CNN interactive, and MSNBC News focused on the study of oceans on other
planets. The articles feature Titan and Cassini prominently. For more
information go to


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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