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Cassini Significant Events 12/08/10 - 12/14/10 The most recent spacecraft telemetry was acquired on Dec. 14
from the Deep Space Network tracking complex at Canberra, Australia. 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" page at: http://saturn.jpl.nasa.gov/mission/presentposition/. Wednesday, Dec. 8 (DOY 342) Orbit Trim Maneuver (OTM) #270 was performed today. This was
an apoapsis maneuver setting up for the Enceladus 13 (E-13) encounter on Dec.
21. The Reaction Control Subsystem (RCS) burn began at 3:30 PM PST. Telemetry
immediately after the maneuver showed a burn duration of 9.5 seconds, giving a
delta-V of 0.016 m/s. All subsystems reported nominal performance after the
maneuver. Last week, a Science Forum was held to discuss the S68
background sequence. S68 is Cassini's first sequence in the new Solstice Mission
sequence development process to run for ten weeks in execution. Prime mission
and Equinox mission sequences typically were built for around five weeks in
execution. Thursday, Dec. 9 (DOY 343) This week in science, the spacecraft was in the apoapsis
portion of the orbit, giving the instruments an opportunity to perform long
observations while observational geometry was changing rather slowly. Science
observations included three observations completed by the Cosmic Dust Analyzer
(CDA) as part of the campaign to study interstellar dust. The Magnetometer
(MAG) performed a 12 hour rolling activity to collect data on the Saturnian
magnetic field, and the Visual and Infrared Mapping Spectrometer (VIMS)
performed a 23.5 hour observation of the E and G rings at a solar phase angle
of 80 degrees. Friday, Dec. 10 (DOY 344) In the last week, 93 Imaging Science (ISS) images and 23
VIMS cubes were generated and distributed. Since Jan. 2004, when Saturn
Approach Science began, 237,022 ISS images and 113,059 VIMS cubes have been
received. Monday, Dec. 13 (DOY 347) Real time commands to normalize the Attitude and
Articulation Control Subsystem (AACS) A8.8.0, Cosmic Dust Analyzer (CDA)
V10.0.4, and Composite Infrared Spectrometer (CIRS) v6 flight software loads
began today and will be completed on Wednesday, Dec. 15. Port 3 products were due today as part of the S67 Sequence
Implementation Process (SIP). The products will be merged and sent out to the
flight team for review. Tuesday, Dec. 14 (DOY 348) A press briefing called "Ice Volcanoes and Hot Plasma
Explosions: Highlights from NASA's Cassini Mission to Saturn," took place
at the American Geophysical Union meeting in San Francisco today. It covered
two topics: the finding of a possible ice volcano, or cryovolcano, on Saturn's
moon Titan and an analysis of hot plasma "explosions" around Saturn
that are linked to mysterious, periodic magnetic field and radio signals from
the planet. They were accompanied by a press release (http://saturn.jpl.nasa.gov/news/newsreleases/newsrelease20101214/)
about the cryovolcano and a feature story about the plasma clouds (http://saturn.jpl.nasa.gov/news/cassinifeatures/feature20101214/). An encounter strategy meeting was held today to cover the
period between Dec. 21 and Jan. 11, Enceladus flyby E-13 and Rhea encounter
R-3, and maneuvers 272-274. ------------------------ To unsubscribe from Cassini Spacecraft Updates or to
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