Cassini Significant Events 05/27/09 - 06/02/09
The most recent spacecraft telemetry was acquired on June 2 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"
Wednesday, May 27 (DOY 147)
A kickoff meeting was held today for the S55 Science Operations Plan
process. The process runs for approximately 15 weeks and will
conclude on Aug. 28 when it will be handed off to Uplink Operations for
final development and execution.
An encounter strategy meeting was held today to cover the period between
June 6 and June 22, Titan flybys T56 and T57, and maneuvers 200-202.
Saturday, May 30 (DOY 150):
Orbit Trim Maneuver (OTM) #198 was performed today. This is the apoapsis
maneuver setting up for the Titan 56 encounter on June 6. The main
engine burn began at 3:14 AM PDT. Telemetry immediately after the
maneuver showed the burn duration was 8.7 seconds, giving a delta-V of
1.46 m/s as planned.
All subsystems reported nominal performance after the maneuver.
Monday, June 1 (DOY 152):
Sequence development for S51 entered the final phase of the final
development process last week. At that time it was determined that
the sequence had become too large to fit in the memory space available
for it on board the spacecraft. As a result, S51 has been split into two
parts. Part one executes from June 12 until July 7 when part two begins.
Part two will conclude on July 23.
ACS flight software version A8.7.7 was uplinked to the spacecraft over
DSN passes on May 26 and 27, and installed on the ACS flight computers on
May 31 and June 1. The final step in this activity will be software
normalization which will occur June 15 and 16.
All participating teams submitted files for the third and final port as
part of the S53 Science Operations Plan process. The files will be
merged tomorrow and released to the project teams.
Tuesday, June 2 (DOY 153)
A beautiful image of spokes in the rings of Saturn was Astronomy Picture
of the Day today. Check it out at:
The downstream propellant cost of canceling OTM #199 was not
significantly different from the cost if the maneuver was executed.
Therefore, the project decided to save a cycle on the thrusters and
OTM-199 was canceled.
Cassini Outreach has released the names of the Cassini Scientist for a
Day Spring 2009 Essay Contest winners. And the winners are:.
Grade 5-6 Category Winners:
· Jonathan Provencal, a 5th grade student at Holliman School in Warwick,
RI, for his essay on Dione.
· Raymond Friend, a 6th grade student at Perkiomen Valley Middle School
East in Collegeville, PA, for his essay on Prometheus and Saturn¹s
· Kayla Morrison, a 5th grade student at Beech Tree Elementary School in
Falls Church, VA, for her essay on Janus and Epimetheus.
Grade 7-8 Category Winners:
· Alyssa Mayer and Amela Mehanovic, 8th grade students at H. Frank Carey
High School in Franklin Square, NY, for their essay on Dione.
· Gulliermo (Willy) Rios, a 7th grade student at Sean Jeanne de Lestonnac
in Tustin, CA, for his essay on Prometheus and Saturn¹s Rings.
· Kabir Brar, a 7th grade student at Kilmer Middle School in Vienna, VA,
for his essay on Janus and Epimetheus.
Grade 9-12 Category Winners:
· Katherine McCarthy, a 12th grade student at Seminole Ridge Community
High School in Loxahatchee, FL, for her essay on Dione.
· Chelsea Kraynak, a 10th grade student at Montgomery Blair High School
in Silver Spring, MD, for her essay on Prometheus and Saturn¹s
· Anthony Bass, an 11th grade student at Seminole Ridge Community High
School in Loxahatchee, FL, for his essay on Janus and Epimetheus.
Congratulations to all of the contest winners, as well as to the
finalists and to all of the students who took the time and effort to
research and write about Saturn¹s moons for this contest.