From: LARRY KLAES (ljk4@msn.com)
Date: Fri May 17 2002 - 11:38:55 PDT
----- Original Message -----
From: cassini@jpl.nasa.gov
Sent: Friday, May 17, 2002 2:20 PM
To: Cassini Spacecraft Updates
Subject: Cassini Significant Events for 05/09/02 - 05/15/02
Cassini Significant Events
for 05/09/02 - 05/15/02
The most recent spacecraft telemetry was acquired from the Goldstone
tracking station on Tuesday, May 14. 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/ .
Instrument activities this week included Visual and Infrared Mapping
Spectrometer (VIMS) and Imaging Science Subsystem (ISS) observations of
Spica, Ultraviolet Imaging Spectrograph (UVIS) observations of the Io
torus, a UVIS Hydrogen Deuterium Absorption Cell conditioning activity,
an ISS Narrow Angle Camera decontamination activity, a Composite
Infrared Spectrometer boresight calibration, uplink and execution of
Cosmic Dust Analyzer (CDA) Flight Software (FSW) and FSW checkout
mini-sequence, a CDA decontamination activity, and uplink of Radio and
Plasma Wave Science (RPWS) Instrument Expanded Block and FSW patches.
ISS performed diagnostic imaging of Spica. Initial analysis indicates a
marked increase in image quality after more than 60 days of instrument
temperatures held above 4C, although contamination still appears to be
present at low levels. The next cycle of warm-up and imaging has
already begun, and will indicate if improvement is tapering off. The
CDA FSW load procedure was successfully completed with all files being
received and expected memory readouts returned. The ACE confirmed CDA
mini-sequence registration and activation on board. The CDA FSW checkout
ran nominally with the exception of a ion grid voltage reset. This is a
minor anomaly and may be reset later without impact. Finally, RPWS
reported seeing the Immediate/Delayed Action Programs execute as
expected.
After the conclusion of instrument activities, a Reaction Wheel Assembly
unload was performed. Reaction wheels were then powered off and the
spacecraft returned to Reaction Control Subsystem control. Additional
on-board activities included clearing of the AACS high water marks and
an autonomous CDS Solid State Recorder memory load partition repair.
Science Planning completed development of the C33 sequence, and provided
a handoff package to the Sequence Team. A Sequence Generation kickoff
meeting was held for C33, stripped subsequences were released to all
instrument teams and the Spacecraft office, and an integrated Sequence
of Events file and Space Flight Operations Schedule were released.
After the conclusion of the orbital Sequence Uplink Verification
activity, a meeting was held to review "lessons learned" from the
exercise.
Science Operations Plan implementation activity kicked off this week
with initial development of the S09 and S10 sequences for orbits 4
through 10.
In support of Science Operations Plan implementation, Mission Sequence
Subsystem (MSS) software version D8 was installed on all Solaris 7
Science Operations and Planning Computers and Operations workstations.
Mission Support and Services Office personnel were able to accomplish
the installation ahead of schedule and thus ensure availability for this
new high priority science planning activity.
Final development and start of system testing for MSS D8.0.1 is
underway. The D8.0.1 versions of the Kinematic Prediction Tool and
Inertial Vector Propagator Tool will be delivered this week for
inclusion in D8.0.1 Pointing Design Tool.
A partial walk-through of the SSR Management Tool (SMT) code was held
with personnel from Mission Planning, and Spacecraft Office Command
& Data Subsystem. A few changes were identified. If time permits,
minor updates may be made to the 8.0.1 release of SMT. If not, the
suggested changes will be incorporated in a later delivery.
Based on a proposal from the Southwest Research Institute (SwRI), and
the results of a technical evaluation, a requisition for additional
funding for SwRI to continue the current level of effort through FY02
has been sent to the JPL contracts office. This will cover the remainder
of the work on Cassini Information Management System that Cassini
requested this fiscal year.
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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