HUBBLE SPACE TELESCOPE
                               DAILY REPORT #961

PERIOD COVERED:  0800 EST
Daily Status Report as of 242/1200Z.

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Two Sets of GHRS/2 3614 (Boron as a Probe of Stellar

       Structure and Mass Loss)

       The High Resolution Spectrograph was used to make four spectral
       observations of the Boron lines in star HD28305. The abundance of
       Boron can be used to study the process on the interior of this star.
       All four spectral observations were reported to look okay. 

   1.2 Completed FGS 4938 (Parallaxes of the Hyades Cluster Members  -

       Cycle 3 High) 

       The Fine Guidance Sensor #3 was used to make astrometric
       observations of the stars VA-472 and PCEN-822 which are members of
       the open Hyades star cluster. These observations are intended to
       determine the parallax of the stars and compute the distance modulus
       for the cluster. This will help improve the estimates of distances
       to other galaxies, which are base on the distance of Cepheid
       variable stars. One recentering event was reported to have occurred
       during the second observations. No other problems were reported. 

   1.3 Uplinked Updated Ephemeris Tables, Per MOSES 2871 

   1.4 Completed FGS 4892 (Duplicity Among Hyades Stars - Cycle 3 High)

       The FGSs were used to make astrometric observations of the possible
       binary star VA119 which is located in the Hyades open cluster. The
       astrometric observations were monitored except for about ten minutes
       at the end of the observation when telemetry was not available. No
       problems were seen, except for two guide star recenterings a few
       minutes after the night/day transition. 

   1.5 Completed FGS 5054 (High Speed Astrometry - A Search for Planetary
       Comparisons to Low Mass) 

       The  Fine Guidance Sensors were used to make observations of the
       position of the star Proxima Centauri to determine the presence of a
       Jupiter sizes planet in orbit about the target star. The OSS
       monitored the observations and assessed the data quality. No
       problems were reported. 

   1.6 Completed FOS/BL 4108 (Supernova Remnants and Nucleosynthesis (FOS

       30): Augmentation Cycle 2)

       The Faint Object Spectrograph (Blue Side) was used to  obtain
       spectral observations over the range of 1150 - 6800 A0 of Supernova
       Remnant N-49 to study the physical conditions in the supernova
       shocks. The observations were executed as scheduled, and no problems
       were reported. 

   1.7 Completed WFC 4849 (GTO High Latitude Parallel Program  - Cycle 3

       High)

       The Wide Field Camera was used to make high latitude sky survey
       observations taken in parallel with the prime science observations.
       The observations were executed as planned, and no problems were
       reported. 

   1.8 Completed WFC/PC 5026 (WF/PC Cycle 3 Calibration: Rapid Internal

       Monitor)

       The Wide Field Camera and the Planetary Camera were used to make
       a set of internal flat calibration images. These images will be used
       to look for measles and daisies (i.e., different forms of
       contamination), and to monitor scattered light. The observations
       were executed as scheduled, and no problems were reported. 

   1.9 Completed HSP/UV1/VIS/UV2/POL 5022 (HSP Photometry calibration -

       Cycle 3)

       The High Speed Photometer was used to make calibration observations
       of star BD+75D325 to help calibrate the detectors/filter
       combinations being used in other subsequent proposals. Each
       observation was chosen to give about one million counts for each
       filter/detector combination. A total of twenty observations were
       made. All the target acquisitions images were received and
       displayed. The photometric observations were reported to look
       normal. 

   1.10 Completed Two Sets of WFC 4292 (Determination of the Mass and

       Densities of Pluto and Charon - Cycle 3)

       The Wide Field Camera was used to make one observation of the
       planet Pluto, its moon Charon, and a nearby reference standard star.
       This image will be used to determine the motion of Pluto about the
       Pluto/Charon barycenter which will make it possible to compute the
       mass ratio of the two bodies and put constraints on their masses and
       densities. The observation was received and displayed. No anomalies
       were reported. 

   1.11 Completed FOS/BL 4976 (UV Rotational Light Curves for Pluto and

       Charon's UV Spectrum - Split)

       The Faint object Spectrograph was used to make a TALED exposure
       subsequent to other spectral observations of the planet Pluto and
       its moon Charon. The TALED observation was received in real time. It
       was reported to look okay. After a corrective SIP maneuver was
       uplinked to the spacecraft, spectral observations were made of the
       planet Pluto. The observations were executed in fine lock. The
       overlight sum during the first observation was around 14,700 counts,
       and during the final two observations was about 3,000 and 550
       counts, respectively. 

   1.12 Completed FGS 5083 (Ultra- High Resolution Studies of AGNs with the
       FGS- Fixed) 

       The Fine Guidance Sensors were used to study the milliarcsecond -
       scale structure of the  jet in radio galaxy Centaurus A using the
       transfer-mode scans. The FGSs were used to scan along the length of
       the linear features. The observations were monitored in the OSS, and
       the data quality was assessed. No problems were reported. 

   1.13 Completed Two Sets of FGS 4893 (Orbital Motions of Close Binary

       Stars - Cycle 3 High)

       Fine Guidance Sensor #3 was used to make astrometric observations of
       the binary star system HD32923 to obtain its orbital elements. These
       observations are important since most of the estimates of stellar
       mass are made by observing elements of these systems. The first five
       minutes of the astrometry observations were monitored, but the rest
       occurred when the telemetry was not available. There were no
       problems seen. 

   1.14 Completed WFC 5013 (WF/PC Cycle 3 Calibration: WFC Flats Narrow. 2)


       The Wide Field Camera was used to make Earth flat calibration images
       to be used for flat fielding of WFC observations. The observations
       used the narrow band filters, both with and without neutral density
       filters. A total of four observations were received. One observation
       was reported to be saturated, and the others were okay. 

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 18
                                        Successful : 18
                          Scheduled Reacquisitions : 22
                                        Successful : 22

   2.2 FHST Updates: 

                              Scheduled : 34
                             Successful : 32

                             The FHST 1 & 2 failed a three axis maneuver
                             mode update at 241/2331Z.  A subsequent update
                             at 2336Z using FHST 1 &3 also failed.  No
                             error vector calculation were made. The
                             possible problem appears to be the usage of a
                             bad guide star. It is currently under

                             investigation.

   2.3 Significant HSTARs: None

   2.4 Operations Note: 

       The  Flight Software Version 9.1 (DF153 ) was successfully installed
       in the DF-224 Computer on the HST spacecraft at 239/1744Z.  All
       indications show that the software is working as was expected. 

3.0 ACTIVITIES SCHEDULED FOR NEXT REPORTING PERIOD: 

   3.1 Complete Three Sets of WFC 4713 (WF/PC Cycle 2 Calibration: WFC

       Internal Delta Flats)

   3.2 Complete WFC 4385 (Spectroscopy and Imagery of Orion's Nebula -

       Cycle 3 High)

   3.3 Complete Two Sets of 4348 (Long Period Variables of M81: Cycle 3

       Medium)

   3.4 Complete PC 4140 (WF/PC Cycle 2 Calibration: Rapid Internal Monitor

       - Part 2)

   3.5 Complete FGS 4935 (Parallaxes of Hyades Cluster Members - Cycle 3

       High)

   3. 6 Complete FOS/RD 4545 (Outgassing From Ceres - Cycle 3 High)

4.0 ANOMALY STATUS:
	
   4.1 Significant New Anomalies: None

   4.2 Significant Unresolved Anomalies: None

5.0 SIGNIFICANT FORTHCOMING EVENTS: 

        The JIS #2 Simulation will be initiated today (Teusday, Aug. 31,
        1993 at 2200Z). The simulation will cover sequences 50 through 60
        (PREP FOR SA RETRACT through SAFE MCU), and should last for
        approximately 37 hours. 

/DMH                        -END-