Cassini Significant Events for 03/30/06 - 04/05/06

Cassini Significant Events
for 03/30/06 - 04/05/06

The most recent spacecraft telemetry was acquired Wednesday, April 5,
the Goldstone tracking stations. The Cassini spacecraft is in an
state of health and is operating normally. Information on the present
position and speed of the Cassini spacecraft may be found on the
Position” web page located at .

Thursday, March 30 (DOY 089)

A friction test was performed today on the prime reaction wheels (RWA)
numbers one, two and four. This test is performed every three months
enable the project to track trends in the state of the wheels. In this
test, the RWAs are spun up to 900 rpm in both directions and are timed
they run down to 0 rpm. The longer the run-down time, the better. The
results for RWAs 1 and 4 were not a cause for alarm, but did indicate
than hoped for trends in friction levels. The results for RWA-2 were
unchanged from previous tests. The Project will continue to monitor
performance closely.

Commands for a Cosmic Dust Analyzer (CDA) decontamination activity were
to the spacecraft today. The mini-sequence will execute on Sunday,
April 2.

An update to the Live Inertial Vector Propagator (IVP) Update products
generated by the S19 leads that includes an update to the Iapetus
vector on
DOY 097T19:38:10. No other changes were made to the products. Uplink
planned for Friday, March 31, with execution beginning on April 7.

Friday, March 31 (DOY 090)

A Software Requirements and Certification Review for ACS flight
patch A8.7.4 occurred today. This is the last review to be held for
A8.7.4 FSW patch uplink activity scheduled for April 10 - 13.

The Magnetospheric Imaging Instrument (MIMI) team sent an automated
processor (ASP) real time command to turn the MIMI collimator on. ASP
used by the instrument teams to send commands that are specific to
instrument, and that will not affect other instruments or the
The tool is valuable in that it reduces the workload of the sequence
by not requiring their involvement in the generation of every
real time command.

A Saturn Observation Campaign member visiting Texas presented an
demonstration of hands-on activities from Cassini’s K-4 Reading,
Writing and
Rings and 5-8 Saturn in your Kitchen programs to the directors of the
Houston Museum of Natural Sciences’ Challenger Centers and the Museum’s
George Observatory. The demonstration took place at the Observatory
an hour south of Houston in Brazos Bend State Park. BotRelease of Ring
World 2 DVD: Ring World 2 includes a Spanish language
version, English language and closed captioning all on one DVD. Copies
been shipped out to members of the International Planetarium Society,
Navigator Program’s Night Sky Network, NASA Solar System Ambassadors,
Place’s museum network, the USGS and throughout the Cassini mission
many Cassini members do school and public talks. In addition, an RW2
for video Ipod is now available.

Tuesday, April 4 (DOY 094):

Science activities this week included the continuation of the
campaign by the Magnetospheric and Plasma Science (MAPS) suite of
instruments, the Ion and Neutral Mass Spectrometer scan for dense
regions far from Saturn, CDA with the search for Saturnian dust stream
particles, and ISS with an icy satellite spectrophotometry campaign.
Composite Infrared Spectrometer team acquired their first higher
high spectral resolution composition measurements of Saturn at 45N

Wednesday, April 5 (DOY 095):

Orbit Trim Maneuver (OTM) #57 will execute late this evening with a
scheduled burn time of 9:40pm Pacific Time. Details of this event will
published in the Significant Events Report next week. OTM-57, an
maneuver, is a main engine burn with a commanded delta-V of 0.37 m/sec

A delivery coordination meeting was held today for the confirmation of
Spacecraft Operations Office updated Command Data Base. CDB version
will be used with the Mission Sequence Subsystem D12 software to be
delivered in May.

Wrap up:

Check out the Cassini web site at for the
press releases and images.

Upcoming Outreach Events:

A Virginia Saturn Observation Campaign Member will present
Mission: results to date” at The Virginia Living Museum in Newport
News, VA,
April 6, 2006. The talk is part of the museum’s Wild and Starry Night
series. Ring World will also be playing in the Planetarium that

The Cassini-Huygens mission is a cooperative project of NASA, the
Space Agency and the Italian Space Agency. The Jet Propulsion
Laboratory, a
division of the California Institute of Technology in Pasadena, manages
Cassini-Huygens mission for NASA’s Science Mission Directorate,
D.C. JPL designed, developed and assembled the Cassini orbiter.

h of these programs
have activities that work well in museum and after school program
These materials are available on the Cassini Education page

Monday, April 3 (DOY 093):

The story of possible liquid water on Enceladus was the top story on today.