Forwarded from Neal Ausman, Galileo Mission Director                                  GALILEO                      MISSION DIRECTOR STATUS REPORT                              POST-LAUNCH                          April 9 - 15, 1993  SPACECRAFT  1.  On April 9, real-time commands were sent, as planned, to reacquire celestial reference after completion of the Low Gain Antenna (LGA-2) swing/Dual Drive Actuator (DDA) hammer activities.  2.  On April 9, the EJ-1 (Earth-Jupiter #1) sequence memory load was uplinked to the spacecraft without incident.  This sequence covers spacecraft activity from April 12, 1993 to June 14, 1993 and includes a window for the Radio Relay Antenna (RRA) slew test on April 28, 1993.  The command loss timer was set to 11 days as a part of this sequence memory load.  3.  On April 12 and 15, a NO-OP command was sent to reset the command loss timer to 264 hours, its planned value during this mission phase.  4.  On April 12, cruise science Memory Readouts (MROs) were performed for the Extreme Ultraviolet Spectrometer (EUV), Dust Detector (DDS), and Magnetometer (MAG) instruments.  Preliminary analysis indicates the data was received properly.  5.  On April 12, an Ultra-Stable Oscillator (USO) test was performed to verify the health status of the USO and to collect gravitational red shift experiment data; long term trend analysis is continuing.  6.  On April 14, a 40bps modulation index test was performed to determine the optimal Signal-to-Noise Ratio (SNR) when transmitting at 40bps.  Preliminary analysis of the data suggests that the present pre-launch selected modulation index is near the optimal level.  7.  On April 15, cruise science Memory Readouts (MROs) were performed for the Extreme Ultraviolet Spectrometer (EUV) and Magnetometer (MAG) instrument. Preliminary analysis indicates the data was received properly.  8.  On April 15, a periodic RPM (Retro-Propulsion Module) 10-Newton thruster flushing maintenance activity was performed; all 12 thrusters were flushed during the activity.  Thruster performance throughout the activity was nominal.  9.  The AC/DC bus imbalance measurements have not exhibited significant changes (greater than 25 DN) throughout this period.  The AC measurement reads 19 DN (4.3 volts).  The DC measurement reads 111 DN (12.9 volts).  These measurements are consistent with the model developed by the AC/DC special anomaly team.  10. The Spacecraft status as of April 15, 1993, is as follows:         a)  System Power Margin -  60 watts        b)  Spin Configuration - Dual-Spin        c)  Spin Rate/Sensor - 3.15rpm/Star Scanner        d)  Spacecraft Attitude is approximately 18 degrees            off-sun (lagging) and 6 degrees off-earth (leading)        e)  Downlink telemetry rate/antenna- 40bps(coded)/LGA-1        f)  General Thermal Control - all temperatures within            acceptable range        g)  RPM Tank Pressures - all within acceptable range        h)  Orbiter Science- Instruments powered on are the PWS,            EUV, UVS, EPD, MAG, HIC, and DDS        i)  Probe/RRH - powered off, temperatures within            acceptable range        j)  CMD Loss Timer Setting - 264 hours            Time To Initiation - 260 hours   GDS (Ground Data Systems):  1.  Galileo participated in a second DSN (Deep Space Network) acceptance test for the DSN Telemetry Phase 3 Upgrade on April 13, 1993, using CTA-21 (Compatibility Test Area 21).  The purpose of this test was to verify the flow of Galileo telemetry data through the new Telemetry Group Controller (TGC) and the Telemetry Channel Assembly (TCA).  The TGC/TCA is the replacement for the current Telemetry Processing Assembly (TPA).  Seven different telemetry rates were run for this test; all ran well on both the MTS (MCCC Telemetry Subsystem) and the AMMOS MGDS V18.0 GIF with the exception of 10bps.  The 10bps rate had some trouble staying in lock; it appears the TGC/TCA was not metering the data correctly.  Further comparisons between the MGDS and MTS data from this test are being conducted. MVT (Mission Verification Test) of the TGC/TCA system is expected to begin May 16, 1993.   TRAJECTORY       As of noon Thursday, April 15, 1993, the Galileo Spacecraft trajectory status was as follows:  	Distance from Earth         152,606,000 km (1.02 AU) 	Distance from Sun           277,519,800 km (1.86 AU) 	Heliocentric Speed          93,400 km per hour 	Distance from Jupiter       543,973,900 km 	Round Trip Light Time       17 minutes, 4 seconds   SPECIAL TOPIC