Status Report

NASA Cassini Significant Events for 12/18/03 – 01/07/04

By SpaceRef Editor
January 9, 2004
Filed under , ,
NASA Cassini Significant Events for 12/18/03 – 01/07/04

The most recent spacecraft telemetry was acquired from the Goldstone
tracking station on Wednesday, January 7. 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 .

On-board activities this week included execution of Probe pre-heating
checkout test #2, a Composite Infrared Spectrometer flight software
checkout, execution of the Ion and Neutral Mass Spectrometer recovery
mini-sequence, and a spacecraft Periodic Engineering Maintenance activity.

Preliminary port one and official port one deliveries were made as part of
the Science Operations Plan implementation process for tour sequences S19
and S20. In addition, preliminary port 1 was delivered for sequences S21
and S22.

The first aftermarket process decision meeting was held as part of the
development process for tour sequence S01.

The Preliminary Sequence Integration and Validation (PSIV) 2 integrated
sequence with Inertial Vector Propagator commands merged in has been
delivered for cruise sequence C42. The final approval meeting will be held
the first week of January. The PSIV1 Seqgen products for C43 were also
released for review along with a sequence of events listing and the space
flight operations schedule.

The international astronomical community and Cassini investigation teams
will begin a program of cooperative, synergistic, ground based observations
of the Saturnian system. The program is planned as a series of regular
monitoring observations of Saturn beginning in 2004 from ground based
observatories. In addition 17 orbits of Hubble Space Telescope observation
time have been obtained. The objective of this program is to acquire a
maximum amount of information about the state of Saturn’s atmosphere, which
could be obtained by imaging and spectroscopy at different wavelengths.

All teams and offices supported the Cassini Monthly Management review.
Delivery coordination meetings were held for the Instrument Operations
Remote Terminal Interface Unit /SEQTRAN V1.0 utility, and Cassini
Information Management System 3.0 (CIMS). The CIMS delivery provides several
functions in support of the Science Planning processes, the most prominent
of which is the Spacecraft Activity Sequence File / Science Planning
Attitude Spread Sheet comparison. This comparison typically takes about
eight hours to perform manually. CIMS 3.0 now does the comparison in less
than a minute.

On December 8, it was reported in a Southwest Research Institute News
Release that the Cassini Plasma Spectrometer (CAPS) has made the first in
situ observations of interstellar pickup ions beyond the orbit of Jupiter.
This is the first major discovery using data gathered by CAPS. For more
information go to:

Saturn will have its closet approach to Earth for the next 29 years on
December 31, 2003. At that time the planet will be about 1.2 billion
kilometers away with the rings tipped towards Earth. Reflected sunlight
will cause the planet to appear brighter than usual. 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.