Cassini Significant Event Report

For Week Ending 06/25/99


Spacecraft Status:


The most recent spacecraft status is from the DSN tracking pass on
Thursday, 06/24, over the Canberra tracking station. The Cassini
spacecraft is in an excellent state of health and is operating normally. The speed of the spacecraft can be viewed on the "Where is Cassini Now?" web page (http://saturn.jpl.nasa.gov/operations/present-position.cfm)


On Saturday, 06/19, the Reaction Wheel Assembly portion of Periodic
Engineering Maintenance was performed and the Venus 2 Science
Mini-Sequence was uplinked to the Spacecraft.


On Monday, 06/21, the Solid State Recorder (SSR-B) record and playback
pointers were reset and the Venus 2 Mini-Sequence began execution.


On Tuesday, 06/22, Flight Software Partition Maintenance was performed.


On Wednesday, 06/23, instruments began to power on for the Venus 2 Flyby.


On Thursday, 06/24, AACS Monitor Threshold Values were set and the Active
Spacecraft IVP Vector was updated for the Venus 2 flyby, science
activities executed for VIMS, MAG, RPWS, MIMI, CAPS, ISS, and UVIS, the
Venus 2 Playback Mini-Sequence was uplinked to the spacecraft, the Solid
State Recorder (SSR-B) record and playback pointers were reset, and a High
Water Mark clear was performed. Earth Occultation occurred from 13:20 to
13:37 PDT with closest approach to Venus occurring at 13:29 PDT.

Upcoming events:


Activities scheduled for the week of 06/25 - 07/01 include setting AACS
Monitor Threshold Values for the post Venus period on 06/25, execution of
the Venus 2 Playback Mini-Sequence with daily playback periods (until
07/03), an SSR Pointer reset, and a High Water Mark clear on 06/26,
perihelion on 06/29, an SSR Pointer Reset on 06/30, and a pre TCM-9 AACS
Parameter Update on 07/01.



Additional information about Cassini-Huygens is online at http://saturn.jpl.nasa.gov.


Cassini will begin orbiting Saturn on July 1, 2004, and release its piggybacked Huygens probe about six months later for descent through the thick atmosphere of the moon Titan. Cassini-Huygens is a cooperative mission of NASA, the European Space Agency and the Italian Space Agency. JPL, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Office of Space Science, Washington, D.C.


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Jet Propulsion Laboratory

California Institute of
Technology


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Administration


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Telephone (818) 354-5011





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