Status Report

NASA Cassini Significant Events for 01/15/04 – 01/21/04

By SpaceRef Editor
January 23, 2004
Filed under , ,
NASA Cassini Significant Events for 01/15/04 – 01/21/04

The most recent spacecraft telemetry was acquired from the Goldstone
tracking station on Tuesday, January 20. 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 .

The first Approach Science sequence, C42, continued this week with
successful uplink and execution of a flight software check-out of the Cosmic
Dust Analyzer flight software version 9.2. A real-time command was sent to
re-synchronize the Cassini Plasma Spectrometer instrument, and the Ion and
Neutral Mass Spectrometer instrument executed a baseline instrument checkout

A major milestone in the completion of the Cassini Science Operations Plan
has been achieved this week, with the Target Working Teams (TWTs) and
Orbiter Science Teams (OSTs) completing integration of the entire four-year
tour of the Saturn system. This effort integrated and resolved conflicts for
all the requested science and engineering activities, defined and integrated
the detailed observation types or observing campaigns, and developed
cooperative/synergistic observation sets and observing campaigns, including
the durations, data volume estimates, and pointing requirements of all those
activities. Kudos to all the science and flight team members that supported
these integration teams over the two and a half year span of this activity.
Special thanks were extended from the Science Planning Team Lead to the
leads and co-leads of the Saturn, Magnetosphere, Rings, Cross-Discipline
TWTs, the Titan Orbiter Science Team (TOST), and the Satellite Orbiter
Science Team (SOST).

The Spacecraft Operations Office (SCO) completed an initial run of the Probe
Relay demo activities in the Integrated Test Laboratory (ITL) this week.
This test-run walked through preliminary versions of files and procedures
for the Probe Relay flight demo, "uplinking" those files to the ITL
spacecraft simulator as they are planned in flight. Another test run is
planned in the coming weeks, as the team continues to prepare and practice
for the Probe Relay flight demo coming up in March.

The C44 Science Planning Team activity concluded this week, making an early
delivery of the plan for the C44 Approach Science sequence to the C44
Sequence Team. The Sequence Team kicked off their Science and Sequence
Update Process (SSUP) activity for C44, which will produce the third and
final Approach Science sequence.

A Cassini Design Team meeting was held to discuss the impact of proposed
changes to the SCO Inertial Vector Propagator (IVP) tool. The change to the
IVP tool would potentially provide better target position modeling for
pointing the Cassini S/C in tour. The meeting reviewed potential impacts of
the change to IVP tool on the upcoming Mission Sequence Subsystem (MSS)
D10.2 delivery, which was baselined to include the upcoming IVP tool

The Instrument Operations Working Group met to review the baseline design of
the Automated Sequence Processor (ASP). The ASP is planned to significantly
benefit the instrument teams, allowing them access to an expedited process
for building, delivering, and uplinking non-interactive files directly to
their instruments. The ASP capability will be delivered as part of MSS

Delivery coordination meetings were held for the Cassini Information
Management System (CIMS) 3.0.1 and RADAR Build 3 ground software sets, and
both were accepted for operational use. The CIMS patch delivery was made to
better implement a Spacecraft Activity Sequence File parsing capability. The
RADAR Build 3 delivery included builds of both the RADAR Mapping Sequencing
Software, a subsystem that builds RADAR Instrument Expanded Blocks (IEBs),
and the Radar Analysis Software, the downlink analysis software subsystem.
Two additional builds of the RADAR software are planned (April ’04 and Oct

The Uplink Operations team received final review comments for their upcoming
SSUP Ops Plan update. The SSUP Ops Plan defines the ten week sequencing
process, which is used to build, uplink, and execute the activities laid out
in the science planning processes that precede the SSUP.

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.