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- From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
- Subject: Galileo Update - 08/21/92
- Message-ID: <1992Aug21.183125.4406@elroy.jpl.nasa.gov>
- News-Software: VAX/VMS VNEWS 1.3-4
- Keywords: Galileo, JPL
- Sender: news@elroy.jpl.nasa.gov (Usenet)
- Nntp-Posting-Host: kelvin.jpl.nasa.gov
- Reply-To: baalke@kelvin.jpl.nasa.gov
- Organization: Jet Propulsion Laboratory
- Date: Sat, 22 Aug 1992 02:31:07 GMT
- Lines: 88
-
- Forwarded from Neal Ausman, Galileo Mission Director
-
- GALILEO
- MISSION DIRECTOR STATUS REPORT
- POST-LAUNCH
- August 14 - 20, 1992
-
- SPACECRAFT
-
- 1. On August 17, a NO-OP command was sent to reset the command loss timer to
- 264 hours, its planned value for this mission phase.
-
- 2. The AC/DC bus imbalance measurements exhibited some change. The AC
- measurement decreased 1 DN and reads 3.1 volts. The DC measurement has
- ranged from 118 DN (13.8 volts) to 132 DN (15.5 volts) and now reads 123 DN
- (14.4 volts). These measurement variations are consistent with the model
- developed by the AC/DC special anomaly team
-
- 3. The Spacecraft status as of August 20, 1992, is as follows:
-
- a) System Power Margin - 69 watts
- b) Spin Configuration - Dual-Spin
- c) Spin Rate/Sensor - 3.16 rpm/Star Scanner
- d) Spacecraft Attitude is approximately 8 degrees
- off-sun (lagging) and 43 degrees off-earth (lagging)
- e) Downlink telemetry rate/antenna-40 bps (coded)/LGA-1
- f) General Thermal Control - all temperatures within
- acceptable range
- g) RPM Tank Pressures - all within acceptable range
- h) Orbiter Science- UVS, EUV, DDS, MAG, EPD, and HIC are
- powered on
- i) Probe/RRH - powered off, temperatures within
- acceptable range
- j) CMD Loss Timer Setting - 264 hours
- Time To Initiation - 184 hours
-
-
- UPLINK GENERATION/COMMAND REVIEW AND APPROVAL:
-
- 1. The EE-9 (Earth-Earth #9) Sequence Final Profile Design was approved by
- the Project on August 17, 1992. This sequence covers spacecraft activities
- from November 23, 1992 to December 5, 1992.
-
- 2. The dual Drive Actuator (DDA) pulse mini-sequence No. 3 memory load was
- approved for generation by the Project on August 20, 1992. This mini-sequence
- covers spacecraft activities from September 8, 1992 to September 11, 1992.
- This mini-sequence will include two 2-second DDA motor turn on pulses, one
- shortly after turning to a 45-degree off-sun attitude and the other just
- before returning to a near sun-pointed attitude.
-
- GDS (Ground Data Systems):
-
- 1. The September 1992 D1.0 software delivery activities are continuing.
- A total of 28 program sets implementing 75 Software Change Requests (SCRs)
- and correcting 181 Failure Reports (FRs) are planned for the D1.0 delivery.
- The D1.0 deliveries will continue thru October 1992 and will provide updates
- to uplink capabilities needed for Jupiter sequence planning and developments
- activities as well as updates to downlink capabilities needed for Earth 2
- support.
-
- TRAJECTORY
-
- As of noon Thursday, August 20, 1992, the Galileo Spacecraft trajectory
- status was as follows:
-
- Distance from Earth 88,904,600 miles (.96 AU)
- Distance from Sun 153,145,300 miles (1.65 AU)
- Heliocentric Speed 51,000 miles per hour
- Distance from Jupiter 656,795,900 miles
- Round Trip Light Time 16 minutes, 4 seconds
-
- SPECIAL TOPIC
-
- 1. As of August 20, 1992, a total of 8110 real-time commands have been
- transmitted to Galileo since Launch. Of these, 3232 were pre-planned in
- the sequence design and 4878 were not. In the past week, 1 real time command
- was transmitted and pre-planned in the sequence design. In addition, 5427
- mini-sequence commands have been transmitted since March 1991; 3269 were
- pre-planned and 2158 were not. In the past week, no mini-sequence commands
- were transmitted. Major command activities this week included commands to
- reset the command loss timer.
- ___ _____ ___
- /_ /| /____/ \ /_ /| Ron Baalke | baalke@kelvin.jpl.nasa.gov
- | | | | __ \ /| | | | Jet Propulsion Lab |
- ___| | | | |__) |/ | | |__ M/S 525-3684 Telos | Optimists live longer
- /___| | | | ___/ | |/__ /| Pasadena, CA 91109 | than pessimists.
- |_____|/ |_|/ |_____|/ |
-
-