NASA Cassini Significant Events for 07/30/04 – 08/04/04

The most recent spacecraft telemetry was acquired from the Goldstone
tracking station on Wednesday, August 4. 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 .

The S02 background sequence concluded with the execution of a Reaction Wheel
Assembly bias activity. S03 began execution on Friday July 30. Initial
activities included the loading of Instrument Expanded Block files, and
uplink of Cosmic Dust Analyzer (CDA) flight software (FSW) version 9.2.4.
The CDA FSW checkout is scheduled for mid August.

Science activities this week mostly centered on Saturn observations. The
Magnetospheric and Plasma Science (MAPS) instruments began a campaign to
study the influence of the solar wind on Saturn’s aurora, while Optical
Remote Sensing (ORS) instruments observed Saturn’s south pole and aurora. In
addition, the Radio and Plasma Wave Science (RPWS) instrument observed
Saturn’s kilometric radio emissions. RPWS team members also gave a
presentation to the flight team recapping science results that had been
presented at last month’s Committee on Space Research (COSPAR) meeting in
Paris, France. Besides Saturn observations, the Imaging Science Subsystem
(ISS) observed the trailing side of Iapetus, which will only be seen on a
few occasions during tour.

In the last week, 747 ISS images arrived and were distributed. So far since
Approach Science began, 15896 ISS images and 4614 Visual and Infrared
Mapping Spectrometer (VIMS) cubes have been returned.

In preparation for the Huygens Probe mission early next year, the Spacecraft
Operations Office (SCO) Integrated Test Lab has completed ten probe relay
fault case tests. Eight tests passed completely. One of the failed cases
was an incorrect fault injection and will be repeated at a later date. The
second failed case is currently being reviewed.

A project briefing was held as part of the Science Operations Plan update
process for S05. This process will complete on Friday, August 6 and a
handoff package presented to the leads for the Science and Sequence Update
Process.

Assessment meetings were held to review all of the requested changes to the
S08 and S09 sequences as part of the Aftermarket process. It appears that
all requested changes will fit within available resources. The Target
Working Teams and Orbiter Science Teams will be reviewing the requests over
the next two weeks and will provide their recommendations at the decision
meeting for S08 scheduled for August 13 and for S09 on August 17.

Development of S04 continued this week. A Preliminary Sequence Integration
and Validation (PSIV) Science Allocation Panel (SAP) Meeting, Simulation
Coordination meeting, and Simulation Procedure Review meeting were held.
The simulation meetings were to coordinate testing of a first time use of
Inertial Vector Definition in a Radio Science boresight calibration
activity.

The Navigation team reported that the post solar conjunction separation
angle is currently about 20 degrees. Tracking data quality has improved
significantly.

The Multi Mission Image Processing Laboratory (MIPL) is performing
certification testing of the Solaris 9 upgrades authorized by the Project as
a part of the MIPL D32 delivery.

A delivery coordination meeting was held for the Attitude Control Subsystem
C-Kernel generation Tool (ACKT) Version 2.0. This Java application queries
the Cassini telemetry database for ACS attitude and rate telemetry from
which it builds a C-Kernel (CK). The CK will be stored locally in the work
directory and can then be published to the file repository.

The Mission Support and Services Office delivered and installed Version
1.3.1 of the electronic command request form (eCRF).

All teams and offices supported the Cassini NASA Quarterly Review.

A presentation on Phoebe science was given to the flight team this week.
Both RADAR and Ultraviolet Imaging Spectrograph teams presented their most
recent findings.

For the most recent Cassini press releases and images go to
http://saturn.jpl.nasa.gov .

The Cassini-Huygens mission 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, manages the
Cassini-Huygens mission for NASA’s Science Mission Directorate, Washington,
D.C. JPL designed, developed and assembled the Cassini orbiter.