Cassini Significant Events for 02/28/07 - 03/06/07

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Cassini Significant Events 
for 02/28/07 - 03/06/07

The most recent spacecraft telemetry was acquired on Tuesday, March 13, from
the Goldstone tracking complex. The Cassini spacecraft is in an excellent
state of health and all subsystems are operating normally. Information on
the present position and speed of the Cassini spacecraft may be found on the
"Present Position" web page located at
http://saturn.jpl.nasa.gov/operations/present-position.cfm.

Wednesday, March 7 (DOY 066):

On Monday, March 5, the sequence leads hosted a meeting to discuss Radio and
Plasma Wave Science (RPWS) whistler observations in future sequences during
the remainder of prime mission. There are only nine possible opportunities
remaining for this activity. At Monday's meeting the details for S29 and S30
were specifically addressed.

Thursday, March 8 (DOY 067):

DSN representatives were able to release a DSN allocation file for the S28
background sequence on March 5.  S28 has been executing since Feb. 17 but
the sequence leads were able to take advantage of this opportunity to
acquire more science data.  Science Allocation Plan (SAP) discussions were
held regarding the distribution of real-time sponge bits as well as the
upgrade of DOY-073 DSS-15, a hef, to DSS-14, the 70-meter antenna at
Goldstone that would allow faster data transmission. A real-time SAP
mini-sequence was uplinked to the spacecraft today.  It has registered on
board, will begin execution on March 13, and will run for the remainder of
the sequence concluding on March 27.

Periodically this weekly report mentions the activities of the sequence
leads for Cassini.  Meet one of them in the most recent video mission report
released by the media relations team.  The video is available at:

http://www.jpl.nasa.gov/videos/cassini/cassini20070308/

Saturday, March 10 (DOY 069):

The Titan 26 targeted flyby occurred today at an altitude of 980 km.
Spacecraft Operations reported that the thruster duty cycle was about 36%,
and 446.8 g of hydrazine were used, very close to the predicted amount of
430 g.  Observations for this flyby included Imaging Science Subsystem
observations of the south pole and performing full-disk color imaging. The
Composite Infrared Spectrometer performed stratospheric and tropospheric
mapping of composition and temperature, in addition to limb sounding of the
stratosphere for vertical resolution and a surface temperature scan. The
Ultraviolet Imaging Spectrograph  measured dayside and night side emissions
in addition to performing a solar occultation, and the Visual and Infrared
Mapping Spectrometer  monitored cloud motion on Titan, probing the deep
structure of Titan's atmosphere during the solar occultation, and mapping of
mid-latitude regions at moderate solar phase angles.

Monday, March 12 (DOY 071):

The S28 DOY 076-083 Live Inertial Vector Propagator Update kickoff meeting
was held today.  Under consideration was an update for Saturn observations
with the Optical Remote Sensing instruments driving the request.   After
Navigation provided the orbit determination solution for OTM-098, it was
determined that the maximum possible pointing error was 0.675 mrad.  With
that small an error the team was able to cancel the update.

A news release went out today discussing the geysers on Enceladus. The
challenge for researchers has been to figure out how this small ice ball
could produce the levels of heat needed to fuel such eruptions.  A new model
suggests the rapid decay of radioactive elements within Enceladus shortly
after it formed may have jump-started the long-term heating of the moon's
interior that continues today. The model provides support for another recent
related finding, which indicates that Enceladus' icy plumes contain
molecules that require elevated temperatures to form.  To gather more
information about the chemistry within Enceladus, the instruments on Cassini
will directly measure the gas emanating from the plume during a flyby
scheduled for March 2008.  For more on this development link to:

http://saturn.jpl.nasa.gov/news/press-release-details.cfm?newsID=729

Tuesday, March 13 (DOY 072):

Orbit Trim Maneuver (OTM) #98 was performed today.  This is the cleanup
maneuver for the Titan 26 encounter on March 10.  The main engine burn began
at 12:15 AM PST. Telemetry immediately after the maneuver showed the burn
duration was 6.64 seconds, giving a delta-V of 1.07 m/sec.  OTM-098 was the
first use of Maneuver Automation Software version 6.1.1.  All subsystems
reported nominal performance after the maneuver.

In addition to the Enceladus report, another news release went out on the
latest Titan Seas story.  Instruments on board Cassini have found evidence
of huge seas on Titan. Scientists reported the seas were likely filled with
liquid methane or ethane and that the discovery reinforced previous
theories. Because of this new information, the flight team is changing the
pointing of the radar instrument during a May fly-by so it can scan directly
over the dark areas seen by the cameras. For more information link to:

http://saturn.jpl.nasa.gov/news/press-release-details.cfm?newsID=731

Wrap up:

Check out the Cassini web site at http://saturn.jpl.nasa.gov for the latest
press releases and images.

The Cassini-Huygens mission 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, manages the
Cassini-Huygens mission for NASA's Science Mission Directorate, Washington,
D.C.  JPL designed, developed and assembled the Cassini orbiter.


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