Status Report

Cassini Significant Events for 06/12/03 – 06/18/03

By SpaceRef Editor
June 20, 2003
Filed under , ,
Cassini Significant Events for 06/12/03 – 06/18/03

The most recent spacecraft telemetry was acquired from the Canberra
tracking station on Wednesday, June 18. 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 .

Final activities for the C37 background sequence included execution of
the Radio Science Subsystem (RSS) Ka-band exciter and Ka-band traveling
wave tube amplifier power-off, and a Magnetometer (MAG) and
Magnetospheric Imaging Instrument (MIMI) plasma environment observation.
Cruise sequence C38 began execution on Saturday, June 14th. Initial
activities included a MAG calibration, Radio and Plasma Wave Science
(RPWS), Ultraviolet Imaging Spectrograph, and MIMI instrument expanded
block (IEB) loads, an RPWS high rate observation, RPWS high frequency
receiver calibration, execution of an RPWS Saturn orbit insertion test
cyclic that will run until June 24th, a Ka-Band power on, an attitude
control constraint monitor update, and execution of a MIMI cyclic. Both
the RPWS and MIMI cyclics are first time events.

The RSS Solar Conjunction Experiment #2 began on Sunday June 17th. It
will run for thirty days until July 15th with daily Goldstone DSN
support and additional coverage from the Canberra and Madrid stations.
As of Tuesday, June 17, the Ka-band Translator (KaT) has been operating
the in a region where it cannot lock on the uplink. The radio science
team is using previously developed contingency commands to cycle the KaT
power in order to restore it to the appropriate operating region.
Coherent X-band and Ka1 data have been successfully acquired

Cruise sequence C39 science planning activities completed on June 13th
with a hand off package delivered to Uplink Operations (ULO). C39
sequence development is underway with a kick-off meeting and the release
of subsequences for the teams to populate.

Events this week for the S14 Science and Sequence Update Process (SSUP)
Verification and Validation (V&V) activity included delivery from the
instrument teams of IEB load Spacecraft Activity Sequence Files for the
SSR, receipt and response to a new DSN allocation file, preparation for
the Science Allocation Panel meeting to be held next week, release of
the merged sequence product for initial review, and the third V&V status

The Integrated Test Laboratory (ITL) completed two significant tests.
One was the first complete run of the Saturn Orbit Insertion critical
sequence demonstration. The demo will execute on the spacecraft starting
on July 21, 2003. The second test completed was the Reaction Wheel
Assembly-4 (RWA-4) checkout, with all commands and associated procedures
verified. RWA-4 checkout is currently scheduled for July 7-11, 2003.

All teams and offices participated in this week’s Cassini monthly
management review.

A Delivery Coordination Meeting was held for the Cassini Information
Management System (CIMS).

The Mission Planning forum discussed the scope of activities to be
performed in C40. C40 will contain the third Gravitational Wave
Experiment and all remaining calibration and checkout activities before
approach science.

ULO presented the CIMS 3.0 baseline, and possible future work, at the
Cassini Design Team meeting. The design team accepted the baseline and
proposed future work.

System Engineering will lead an effort to simplify and unify the
directory structures on development, operations, and Science Operations
and Planning Computer environments where software is installed.

An Associated Press article appearing on the web it reported that the
winds of Saturn appear to be slowing dramatically just as NASA’s Cassini
spacecraft approaches the ringed gas planet. The Cassini spacecraft is
due to arrive July 2004 for a 4 year orbital mission, and may provide
more direct measurements to help explain the mystery of the diminishing
winds. 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.

SpaceRef staff editor.