Cassini Significant Events for 02/06/08 - 02/12/08

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Cassini Significant Events 
for 02/06/08 - 02/12/08

The most recent spacecraft telemetry was acquired on Tuesday, February 12,
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, February 6 (DOY 037):

The JPL Media Relations Office in conjunction with GSFC produced a web
feature on Saturn's A ring acting as a sponge, trapping particles from the
plumes of Enceladus. Prior to Cassini, it was believed that Enceladus and
the A-ring of Saturn were separate and distinct entities, but Cassini's
unique observations indicate that Enceladus is actually delivering a portion
of its mass directly to the outer edge of the A-ring.  For more details on
this story link to:
http://saturn.jpl.nasa.gov/news/features/feature20080205.cfm

The following link will take you to a great false color image and brief
write up of the plumes of Enceladus.
http://saturn.jpl.nasa.gov/multimedia/images/image-details.cfm?imageID=2779

Thursday, February 7 (DOY 038):

AACS A8.7.6 flight software normalization was successfully concluded today.
This completes the update to A8.7.6, which was uplinked to the spacecraft
back in January.

The JPL Media Relations Office issued a web feature based on a paper in
Nature about the "plumbing" within Saturn's moon Enceladus. Enceladus is
jetting out giant geysers three times its size, and now scientists are
beginning to understand how the ice grains are created and how they might be
formed. Knowing the process of how the plumes form and the path the
water-ice particles have to travel is providing an insight into what may be
a reservoir of liquid water lying just beneath the surface.  For the full
article link to: http://www.jpl.nasa.gov/news/features.cfm?feature=1597

Friday, February 8 (DOY 039):

The Titan Orbiter Science Team held the final preview meeting for the
remaining Titan flybys in the prime mission.  All participating instrument
teams presented plans for data acquisition and science observations for the
T41 through T44 flybys.

The Cosmic Dust Analyzer (CDA) completed the second of two demonstrations
intended to exercise new V12 instrument flight software. All goals of the
demonstration were met, and the software performed as expected.  V12 was
specifically developed to enhance the CDA observations during the Enceladus
flyby coming up in March.

Non-targeted flybys of Epimetheus, Pandora, and Atlas occurred today.

This was another busy day for science. The Composite Infrared Spectrometer
(CIRS) began with sub-millimeter ring measurements.  Radio Science (RSS)
then performed both ring and Saturn Earth-occultations as the spacecraft
sped toward a periapsis distance of 3.3 Saturn radii.  The Visual and
Infrared Mapping Spectrometer (VIMS) turned the spacecraft's attention to
Dione, with the other optical remote sensing (ORS) teams riding along.
Following periapsis passage, the Ion and Neutral Mass Spectrometer (INMS)
wielded rare - for them - spacecraft pointing control to measure inner
magnetospheric composition. Finally, the RADAR instrument began an effort to
obtain a polar map of the southern hemisphere, while taking rings
observations at high inclination.

Over the weekend, RADAR will wrap up its polar mapping and VIMS will begin
cylindrical mapping of Saturn.  UVIS will observe another occultation of a
star by the rings.  CIRS will take temperature measurements of the rings and
lead a joint ORS observation of Dione. Magnetospheric and Plasma Science
(MAPS) teams will continue imaging the dynamics of the inner magnetosphere.
 
Monday, February 11 (DOY 042):

A close-up image of Saturn's moon Epimetheus is Astronomy Picture of the Day
today.
Check it out at: http://antwrp.gsfc.nasa.gov/apod/ap080211.html

An article produced by the JPL Media Relations Office featuring the new
Cassini mural in Bldg. 230 can be found at:
http://saturn.jpl.nasa.gov/news/features/feature20080208.cfm

Science today involves VIMS taking the lead with the other ORS teams riding
along in an effort to gain more Saturn polar coverage.  Imaging Science
(ISS) will take a look at spoke formation in the rings, while MAPS teams
continue their measurements of the dynamics of the inner magnetosphere.

The majority of the instrument expanded block files for S38 were uplinked to
the spacecraft today.  The remainder will go up over the next two days with
uplink of the background sequence to occur Wednesday.

The Science Operations Plan (SOP) Implementation kickoff meeting for S42,
the first sequence of the proposed extended mission, occurred today.
Because there is no aftermarket process or SOP update process in extended
mission, the SOP Implementation process has three delivery ports instead of
two.  The first will occur on Feb. 22.

Tuesday, February 12 (DOY 043):

Today was a heavy day for sequence development meetings.  The day began with
the final approval meeting and command approval meeting for the S38
background sequence.  Then a kickoff meeting was held for the Saturn/Janus
DOY 051-052 Live Inertial Vector Propagator (IVP) update.  Just after that
meeting, the ISS and CIRS teams confirmed that the update would not be
required for them.  That made it unanimous among CIRS, ISS, Ultraviolet
Imaging Spectrograph (UVIS), VIMS, and Science Planning so the update has
been cancelled. The next candidate live update is scheduled to execute the
last few days of February and on into March.  The process for this event
will likely begin next week.

Finally, the S40 Science Operations Plan Update wrap-up and Science and
Sequence Update Process kick off meeting was held.  The first version of the
sequence of events and space flight operations schedule files have been
created and the stripped subsequences sent to the participating teams for
review.

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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