Cassini Significant Events 07/15/09 - 07/21/09
Title: Cassini Significant Events 07/15/09 -
The most recent spacecraft telemetry was
acquired on July 21 from the Deep
Space Network tracking complex at Madrid, Spain. The Cassini
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"
Wednesday, July 15 (DOY 196)
An encounter strategy meeting was held today to cover the period
July 24 and August 9, Titan flybys T59 and T60, and maneuvers
The Target Working Team (TWT)/ Orbiter Science Team (OST)
products for S57, covering orbits 125 through 127, from January 2010
March 2010, were delivered today. The integrated products are in their
form and no re-integration is planned. The next step in sequence
development, Science Operations Plan (SOP) implementation, will kick
July 29. Between now and then, the instrument teams will be working
pointing designs for the sequence. TWT/OST teams deliver integrated
products for the extended mission about every five weeks.
Thursday, July 16 (DOY 197):
Science today included Imaging Science (ISS) observations of the
small moons following Saturn, and the Magnetospheric and Plasma
(MAPS) instruments' study of the solar wind boundary of Saturn's
magnetosphere. This was followed by a Composite Infrared Spectrometer
observation designed to study the polarization of light reflected
Saturn's rings at far infrared wavelengths.
Today sequence leads uplinked seven Instrument Expanded Block (IEB)
the spacecraft in support of S52. The remaining two IEBs will go
Saturday, and the background sequence will go up on Monday. The
sequence will begin execution on Thursday, July 23.
Friday, July 17 (DOY 198):
Today the Visual and Infrared Mapping Spectrometer (VIMS) trained
sensors on Antares for calibration purposes. Periodic
critical to the successful interpretation of VIMS and other
observations. The calibration was followed by another MAPS study of
boundary region of the magnetosphere, and Navigation imaging. At
the end of
the day the Ultraviolet Imaging Spectrograph (UVIS) turned towards
Sagittarius to watch it slip behind the rings of Saturn.
Orbit Trim Maneuver (OTM) #207 was performed today. This was the
maneuver setting up for the Titan 59 encounter on July 23. The
Control Subsystem (RCS) burn began at 10:15 AM PDT. Telemetry
after the maneuver showed the burn duration was 24.13 seconds, giving
delta-V of 32.68 mm/s. All subsystems reported nominal performance
Saturday, July 18 (DOY 199):
A nearly edge-on telescopic view of Saturn's rings was offered to
attendees at a star party in Warner Springs, CA, on July 18.
Outreach members participated in the event.
Monday, July 20 (DOY 201):
After the kick off meeting today for the DOY 207 Live Inertial
Propagator (IVP) update, instrument teams reviewed the impact if the
were cancelled. It turned out that CIRS would have lost part of
observation and ISS would not have gotten their images of the plumes
the limb of Enceladus. As a result, the team will proceed with the
and vectors for both Saturn and Janus for ISS and VIMS will be
Final files will be delivered on July 23 with an approval meeting held
July 24. The files will be uplinked that same day and will
Sunday, July 26.
Tuesday, July 21 (DOY 202):
Thanks to accurate orbit determination and execution of OTMs 206 and
the maneuver planned to correct the delivery dispersions for the Titan
flyby was smaller than the permissible minimum RCS maneuver
Execution of OTM-208 would have required the addition of a time of
approach bias to increase the magnitude to an achievable level.
planning has evaluated both the maneuver
and no-maneuver cases and found
both to be acceptable. Cancellation reduced the predicted down
delta-V by about 90 mm/sec. Therefore OTM 208, originally scheduled
execute today, was cancelled.
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