Status Report

NASA Cassini Significant Events for 07/24/03 – 07/30/03

By SpaceRef Editor
August 1, 2003
Filed under , ,
NASA Cassini Significant Events for 07/24/03 – 07/30/03

The most recent spacecraft telemetry was acquired from the Goldstone
tracking station on Wednesday, July 30. 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 a Radio and Plasma Wave Science
High Frequency Receiver calibration, activation of the Saturn Orbit
Insertion (SOI) demonstration critical sequence, a pre-SOI demo ACS
configuration activity, and an instrument reconfiguration for the SOI
demo. This demo marks the first time that a critical sequence has been
executed at a non-critical time, and exercises the last aspects of the
flight software installed earlier this year.

The Spacecraft Operations Office reported that the SOI demo critical
sequence is currently active on the spacecraft and running in both CDS
strings. The first five commands were sent, and all telemetry to this
point is per predict. The command loss timer was successfully reset to
9.25 days, as planned. The next critical sequence activity occurs on
Monday, August 4th. Data from this activity will be received on the
ground at 8:58 A.M. PDT. The spacecraft will be monitored daily for this
exercise during each day’s Goldstone pass.

The C39 Preliminary Sequence Integration and Validation (PSIV) package
has been delivered to the teams for review, and all sequence change
requests (SCR) have been submitted. Next week both the preliminary and
final sequence approval meetings will be held.

The S14 Science and Sequence Update Process (SSUP) Verification and
Validation (V&V) activity concluded this week. Activities performed
included generation of the PSIV2 and Final Sequence Integration and
Validation (FSIV) products, delivery of final default live movable block
sequences and trigger immediate/delayed action programs, generation and
release of the FSIV approval package, an FSIV SCR approval meeting, and
the final sequence approval meeting. A final wrap-up review meeting has
been scheduled for next week.

A wrap-up meeting was held this week for Science Operations Plan
implementation of tour sequences S07/S08. The products from this process
have now been archived. A kickoff meeting was held for S01/S02 and
S03/S04. SO1/S02 is the last use of the 3-port implementation process
for tour with S03/S04 being the first use of the 2-port implementation
process. Now that V&V activities have concluded, two tour
implementation processes will be conducted simultaneously.

A scoping meeting for C42 was held at the Mission Planning Forum. How
the sequence will be planned was discussed along with a detailed DSN
schedule with information on criticality and flexibility. This latter
item was a main point of the discussion, to identify how the project
should be delivering planned pass requests to the schedulers to properly
equip them to negotiate prior to the SOP Update process.

A delivery coordination meeting was held for Mission Sequence Subsystem
(MSS) D9.1. The software has been installed, and is in use by Science
Planning in the development of SOP products for S01, 02, 03, and 04.
Additionally, the port of MSS D9.1 to Solaris 9 for MSS D10.0 has
started and initial progress is good.

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.