Cassini Significant Events -- 04/08/09 - 04/14/09
Title: Cassini Significant Events -- 04/08/09 -
Cassini Significant Events
04/08/09 - 04/14/09
The most recent spacecraft telemetry was acquired on Apr. 14 from
Space Network tracking complex at Goldstone, California. The
spacecraft is in an excellent state of health and all subsystems
operating normally. Information on the present position and speed of
the Cassini spacecraft may be found on the "Present Position"
Wednesday, April 8 (DOY 098)
The Cassini Mission Website is a 2009 Webby nominee. As one of
nominees in its category, the Cassini mission site is eligible for
internet industry's two most sought-after awards: The Webby Award and
Webby People's Voice Award. While the Academy selects The Webby
winners, the online public selects The People's Voice Award winners.
People's Voice voting starts April 14th and ends April 30th. Each
can only vote once. Wired magazine seems to be running neck and
Cassini. Webby Award and Webby People's Voice Award Winners will
announced on May 5, 2009. Winners will be honored at the
13th Annual Webby
Awards in New York City on June 8, 2009. To register to vote for
People's Choice, go to http://www.webbyawards.com/
Thursday, April 9 (DOY 099):
Members of Science Planning gave a presentation today to personnel
Advanced Multi-Mission Operations System (AMMOS) Working Group.
AMMOS asked for the presentation to assist in understanding what the
Cassini flight team
is doing and what AMMOS-provided capabilities need continuing
presentation was designed to provide insight on the complexity of
operations and what tools are currently in use for uplink
Friday, April 10 (DOY 100):
The first science observation today was an Imaging Science (ISS) movie
the mysterious "spoke feature" on Saturn's rings. For
almost six hours,
ISS, along with the Composite Infrared Spectrometer and the Visual
Infrared Mapping Spectrometer, took advantage of the lit side of the
to look for periodicities of the feature. After the spoke movie,
the smaller satellites as part of an orbit determination series.
Titan came back into the field of view and a 7 hour 24 minute
Titan's clouds occurred.
Sunday, April 12 (DOY 102):
A non-targeted flyby of Titan occurred on Saturday, Apr. 11.
Orbit Trim Maneuver (OTM) #189 was performed today. This was a
maneuver setting up for the Titan 53 encounter on Apr. 19 and reflects
first use of updated Maneuver Automation Software version 8.1.
engine burn began at 6:15 AM PDT. Telemetry immediately after the
showed the burn duration was 42.2 seconds, giving a delta-V of 7.12
subsystems reported nominal performance after the maneuver.
Monday, April 13 (DOY 103):
A week-long end-to-end test began today for the AACS flight software
A8.7.7 update planned for uplink at the end of May 2009. This version
will cover the period from June 2009 through July of 2010, and will
the default safing attitude and the default thruster magnitudes.
All delivered files received for port 1 of the S53 Science Operations
process have been merged. Science Planning has released its
the product with comments and areas that need to be revised. In
presentation was given on the science highlights for this sequence
focus on what is unique, and what observations have the highest
This information will help the flight team as the sequence goes
development process, and assist the team in making trades should the
Tuesday, April 14 (DOY 104):
On Thursday, Apr. 9, the DSN declared Deep Space Station (DSS) 14, the
antenna at Goldstone, red due to a problem with the runner assembly,
given a return to service estimate of no earlier than Apr. 27. Cassini
three tracks scheduled to be supported by DSS-14 during this
occur on DOY 105, 110 and 114. The track on DOY-114 was of
concern as it was scheduled to support playback of data from the Titan
flyby. There is no health and safety issue for the spacecraft
but the loss
of this station does represent an impact to science data return.
scheduler supporting Cassini has acquired partial tracks at DSS-43 on
105 and 106 to assist with playback. In addition, the telemetry modes
on-board data policing strategy will be updated by real time commands
insure return of higher priority data. Having ensured that the
feasible has been done for DOY 105, Uplink Operations and Science
will now turn their efforts to the tracks on DOY 110 and 114.
to work around problems such as this one are never easy since the
flight projects planning on being supported by DSS-14 have the same
as Cassini. Stay tuned next week for an update.
To unsubscribe from Cassini Spacecraft Updates or to subscribe with a
different email address, visit:
This email address is not monitored. For comments and questions,
please contact Cassini Outreach at:
Visit the JPL Cassini home page for more information about the Cassini
[Bake Sale for NASA]