From: baalke@kelvin.jpl.nasa.gov (Ron Baalke)
Newsgroups: sci.space.news
Subject: Galileo Update - 08/21/92
Keywords: Galileo, JPL
Date: 22 Aug 92 02:30:32 GMT
Reply-To: baalke@kelvin.jpl.nasa.gov
Followup-To: sci.space
Organization: Jet Propulsion Laboratory
News-Software: VAX/VMS VNEWS 1.3-4

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.
|_____|/  |_|/       |_____|/                     | 
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