Cassini Significant Events 05/06/09 - 05/12/09
Title: Cassini Significant Events 05/06/09 -
The most recent spacecraft telemetry was acquired on May 12 from
the Deep Space Network tracking complex at Goldstone, California.
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:
Wednesday, May 6 (DOY 126):
The International Astronomical Union (IAU) Working Group for Planetary
System Nomenclature has approved a new designation and name for a
satellite of Saturn discovered by Cassini, cf.
IAUC 8873: Saturn LIII
Aegaeon = S/2008 S 1
Aegaeon is estimated to be half a kilometer in diameter, orbits within
the bright segment of Saturn's G ring, and is likely a major source of
the ring. Debris knocked off the moon forms a bright arc near the
inner edge, which in turn spreads to form the rest of the ring.
In Greek mythology, Aegaeon was one of the three Hecatonchires.
Children of Gaia and Uranus - or the Earth and Sky - the name
"Hecatonchires" derives from the Greek for "hundred" and
"hand", with each of the three having one hundred hands and fifty
heads. They were giants of incredible strength and ferocity,
even superior to that of the Titans, whom they helped overthrow, and
Thursday, May 7 (DOY 127):
Last week it was reported that the flight team had made the
determination, and uplinked the necessary files, to increase the
command loss timer (CLT) value on-board the spacecraft from the
nominal 90 hours to six days. Now that DSS-14 is back up and
running smoothly, commands have been sent to return the CLT to the
nominal 90-hour value.
This evening, AACS powered on Sun Sensor Assembly B and performed a
real-time checkout from telemetry data during the rolling
Results of this annual checkout indicate that the sensor is
Friday, May 8 (DOY 128):
An analysis of the current spacecraft trajectory has shown that
the excellent delivery accuracy to the Titan 54 encounter has placed
the spacecraft just about exactly on the planned post encounter
trajectory. This coupled with the 2 m/s deterministic maneuver planned
for next Thursday - Orbit Trim Maneuver (OTM) # 195 - resulted in
a minimum delta-V solution that did not include OTM-194. The smooth
Titan flyby also resulted in a converged orbit determination solution
after only one tracking pass. As a result, OTM-194, scheduled
for May 8, has been cancelled.
Monday, May 11 (DOY 131):
The Target Working Team (TWT)/Orbiter Science Team (OST)
integrated products for S55 covering orbits 121 through 123 were
delivered today. The integrated products are in their final form and
no re-integration is planned. The next step in sequence development,
Science Operations Plan (SOP) implementation, will kick off on May 27.
Between now and then, the instrument teams will be working on pointing
designs for the sequence. TWT/OST teams deliver integrated sequence
products for the extended mission about every five weeks.
Tuesday, May 12 (DOY 132):
The final sequence development process for S52 began today. On
Friday of last week, Science Planning handed off all input products
from the Science Operations Plan process, and today the kickoff
meeting for the Science and Sequence Update Process was held.
Development for the AACS Flight Software (FSW) update A8.7.7 concluded
today when the software was reviewed and accepted at the Software
Requirements and Certification Review. Uplink is scheduled to begin on
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