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Cassini Significant Events 01/12/11 - 01/18/11 The most recent spacecraft telemetry was acquired on Jan. 17
from the Deep Space Network tracking complex at Madrid, Spain. 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, Jan. 12 (DOY 012) This week in science began with two calibrations: the
Composite Infrared Spectrometer (CIRS) performed an 8 hour scattered stray
light test and the Ultraviolet Imaging Spectrograph (UVIS) executed a 3 hour
stellar calibration with the star Spica. The Cassini Plasma Spectrometer (CAPS)
then completed a 14.5 hour low latitude Saturn observation at apoapsis. The
Composite Infrared Spectrometer (CIRS), Imaging Science (ISS) and VIMS
performed distant observations of Titan to monitor the atmosphere and cloud
activity and look for surface changes across the anti-Saturn hemisphere of
Titan. The Magnetometer performed an 8 hour calibration with the spacecraft
rolling about its X-axis. ISS made astrometric observations of Saturn's small,
inner moons Polydeuces, Telesto, Methone, Pandora, Atlas, Anthe, and
Epimetheus. Thursday, Jan. 13 (DOY 013) Commands were uplinked to the spacecraft today in support of
the S66 Magnetospheric Imaging Instrument (MIMI) Ion and Neutral Camera(INCA)
high voltage Instrument Expanded Block (IEB) update; the MIMI instrument team
verified that the commands to load the new IEBs executed properly. The S66
background sequence was also radiated to the spacecraft and will begin
execution on DOY 017; the uplink team confirmed successful receipt of the S66
background sequence. Attitude and Articulation Control Subsystem (AACS) Periodic
Engineering Maintenance was completed today. This activity, performed
approximately every 90 days, spins up the reaction wheel assembly #3 (RWA-3) to
100 rpm for lubrication purposes, exercises the back-up Engine Gimbal Assembly,
and verifies the Back-up Assisted Load Format Injection Loader (BAIL) software. A feature story called “Cassini Rocks Rhea
Rendezvous” is available on the Cassini web site. It describes how the
Cassini spacecraft completed its closest flyby of Saturn's moon Rhea, returning
high resolution images of the icy moon's surface. Pictures of the Rhea surface
taken around the time of closest approach at 4:53 AM UTC on Jan. 11 show
shadowy craters at a low sun angle. A portrait of a bright, icy Rhea also
captures Saturn's rings and three other moons clearly visible in the
background. For more information on this subject link to: http://saturn.jpl.nasa.gov/news/cassinifeatures/feature20110113/. Friday, Jan. 14 (DOY 014) Orbit Trim Maneuver (OTM) #275 was performed today. This was
the clean-up maneuver following the Rhea 3 encounter on Jan. 11. The main
engine burn began at 6:45 AM PST. Telemetry immediately after the maneuver
showed a burn duration of 15.97 seconds, giving a delta-V of 2.76 m/s. All
subsystems reported nominal performance after the maneuver. Today is the sixth anniversary of the Huygens Probe entry,
descent, and relay, which landed on the surface of Titan on Jan. 14, 2005. Saturday, Jan. 15 (DOY 015) The command loss timer value was set to 115 hours today.
This is the new default value for the Solstice Mission. Sunday, Jan. 16 (DOY 016) The Downlink Ground System (DGS) team submitted a Perimeter
Access Request (PAR) in support of the Java Distributed Object Manager (DOM)
transition and testing task. The PAR system allows service providers to request
IP service access by protocol and port to a host, along with workflow for
approval, request tracking, and documentation. Java DOM training and
demonstrations are scheduled and will be provided next week during the Project
Science Group (PSG) meeting #53 beginning Jan. 24. Monday, Jan. 17 (DOY 017) The S66 sequence began execution today at 2011-017T08:42:00.
The sequence will run for 49 days and conclude on March 7. During that time
there will be one targeted encounter of Titan and seven non-targeted flybys -
two of Enceladus and one each of Epimetheus, Calypso, Helene, Pallene, and
Tethys. Four OTMs are scheduled, numbered 276 through 279. Tuesday, Jan. 18 (DOY 018) A Mission Planning forum was held today to review the status
of the instrument and spacecraft consumables tracked by MP. The status of the
consumables as of the end of Equinox Mission was reported and consumables
nearing or exceeding their allocation were identified. Periodic reviews of
consumables status allow the project to stay informed of consumable use and
identify high use consumables. ------------------------ To unsubscribe from Cassini Spacecraft Updates or to
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