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Posted by baalke on April 27, 2007, 8:26 pm
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Cassini Significant Events
for 04/18/07 - 04/24/07
The most recent spacecraft telemetry was acquired on Tuesday, April
24, 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, April 18 (DOY 108):
Orbit Trim Maneuver (OTM) #105 was performed today. This is the
apoapsis
maneuver setting up for the Titan 29 encounter on April 26. The main
engine
burn began at 9:45 PM PST. Telemetry immediately after the maneuver
showed
the burn duration was 21.9 seconds, giving a delta-V of 3.51 m/s. All
subsystems reported nominal performance after the maneuver.
Friday, April 20 (DOY 110):
An encounter strategy meeting was held today to cover the period
between
April 26 and May 12, Titan flybys T29 and T30, and maneuvers 107-109.
Monday, April 23 (DOY 113):
Orbit Trim Maneuver (OTM) #106 was performed today. This is the
approach
maneuver setting up for the Titan 29 encounter on April 26. The
reaction
control subsystem (RCS) burn began at 9:30 PM PST. Telemetry
immediately
after the maneuver showed the burn duration was 9.0 seconds, giving a
delta-V of 0.017 m/s. All subsystems reported nominal performance
after the
maneuver.
This was the first OTM where the team adjusted the targeted time of
arrival
in order to make the OTM large enough to perform. As a policy, we had
set
the minimum delta-V limit for RCS burns at about 10 mm/sec. Without
the
arrival time adjustment, this OTM was around 8 mm/sec., which is below
the
minimum limit. The team was further constrained in that this OTM was
not a
candidate for cancellation, as the downstream delta-V cost of more
than 2
m/sec was too high. This OTM was also particularly challenging as the
team
tried to find a design that minimized low-rpm regions for the reaction
wheels.
The Science Operations Plan update process for the S33 sequence kicked
off
today. The process will run for about five weeks and then will be
handed
off to the sequence leads for final development.
Tuesday, April 24 (DOY 114):
Today there were non-targeted flybys of Dione and Telesto. Although
there
were no observations planned for Telesto, the Imaging Science
Subsystem
acquired a two-by-two narrow angle camera mosaic of Dione, referred to
as a
regional map.
The Cassini-Huygens Analysis and Results of the Mission (CHARM)
teleconference for April was held today. The topic, "Enceladus:
Cassini
finds another Active World" was presented by a member of the Composite
Infrared Spectrometer instrument team.
The sequence for the second Radio and Plasma Wave Science Whistler
search
was uplinked to the spacecraft last Friday and executed on board
today. The
science teams are in the process of analyzing the data.
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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