HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1637

PERIOD COVERED:  0000Z (UTC) 05/17/96 - 0000Z (UTC) 05/20/96

Daily Status Report as of 141/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed WF/PC-2 6009 (Jovian Stratospheric and Tropospheric =
Circulation and Structure)

       The WF/PC-2 was used to make high resolution, multi-filter =
observations of the planet Jupiter to study it stratospheric and =
tropospheric circulation and structure.  This study is being done several =
months before and after the Galileo probe entered the atmosphere on Dec. =
7, 1995.  The observations were completed as scheduled, and no anomalies =
were reported.

   1.2 Completed GHRS/2 5869 (Chromospheric Activity in Quiet stars: Halo =
Subdwarfs)

       The High Resolution Spectrograph (Side Two) was used to make =
spectrographic observations of the quiet star HD140283 to study its =
chromospheric activity.  This is a search for Mg II emission in low =
metallicity solar temperature field stars in the galactic halo.  The =
observations were completed as planned, and no problems were reported.

   1.3 Completed FOC/96 6349 (Snapshot search for High Redshift QSOs with =
Far-UV Flux)

       The Faint Object Camera (f/96) was used to make snapshot images of =
the quasi-stellar object Q1107+488.  This is to determine if this high =
redshifted object has a far ultraviolet flux.  The observations were =
executed as scheduled, and no anomalies were noted.

   1.4 Completed FOS/RD/GHRS/1 5934 (A Search for UV Absorption Lines in =
the Intracluster Medium of Abell Cluster 1030)

       The Faint Object Spectrograph (Red Side) and the High Resolution =
Spectrograph (Side One) were both used to make observations of the QSO =
B21028+313 in order to look for ultraviolet absorption lines in a search =
for an intracluster medium in Abell Cluster 1030.  Recent low energy =
observations suggest that such a medium exists.  A wavelength calibration =
image was also taken.  The observations were executed as scheduled, and =
no anomalies were noted.

   1.5 Completed FOS/RD 6236 (FOS Cycle 5: Location of Spectra and =
Wavelength Calibration: Red Side Detector)

       The Faint Object Spectrograph (Red Side) was used to make =
calibration observations in order to determine the location of the =
spectra and to perform a wavelength calibration.  All observations were =
internal.  A Taled calibration was also completed.  The observations were =
completed as planned, and no anomalies were reported.

   1.6 Completed WF/PC-2 6431 (Determination of the Extragalactric =
Distance Scale)

       The WF/PC-2 was used to make observations of the galaxy NGC-4548 =
to be used in measuring the periods of Cepheid variable stars within this =
galaxy.  This will allow for a more accurate estimate of the distances to =
these galaxies through the period-luminosity relation for the Cepheid =
stars.  The observations were executed as scheduled, and no anomalies =
were noted.

   1.7 WF/PC-2 6658 (Intergalactic Stars in the Virgo Cluster)

       The WF/PC-2 was used to make deep imaging observations of a blank =
field within the Virgo galactic cluster to look for possible =
intergalactic stars.  These data will be searched for individual red =
branch (RGB) stars, which should stand out against the background faint =
galaxies.  The observations were completed as scheduled, and no problems =
were reported.

   1.8 Completed WF/PC-2 5997 (The Cores of Elliptical Galaxies in the =
Coma Cluster)

       The WF/PC-2 was used to make observations of the large elliptical =
galaxy NGC-4789 which is located in the Coma Cluster.  The purpose is to =
study the luminosity profiles in the central nuclear region.  The =
observations were completed as scheduled, and no anomalies were noted.

   1.9 Completed WF/PC-2 6250 (WF/PC-2 Cycle 5 Calibration: Internal =
Monitor)

       The WF/PC-2 was used to make a series of internal calibration =
observations.  Internal flats, biases, and K-Spot calibration images were =
taken.  These observations are designed to monitor the health of the =
cameras.  The observations were executed as scheduled, and no anomalies =
were noted.

   1.10 Completed FOS/BL/GHRS/1 6680 (The Post Mass-Transfer Binary S1040 =
in M67)

       The Faint Object Spectrograph (Blue Side) and the High Resolution =
Spectrograph (Side One) were used to make observations of the post-mass =
transfer binary star system S1040 which is located in M-67 (aka, =
NGC-2682) an open cluster in Cancer.  Based on the anomalous color of =
this star, which place it to the blue of the red giant branch (RGB) in =
the cluster's HR diagram, and the much higher than expected ultraviolet =
flux, it is expected to find a hot white dwarf companion star.  The =
observations were completed as planned, and no problems were reported.

   1.11 Completed WF/PC-2 5967 (Imaging Clusters of Galaxies at Z>1)

       The WF/PC-2 was used to make deep images of the galaxy cluster =
3C210 which is know to have a redshift of Z>1 to study its galaxies' =
morphology.  The observations were completed as planned and no anomalies =
were reported.

   1.12 Completed FOS/BL 6612 (Damped Lyman-Alpha Absorption Lines From =
Moderate Redshifted Galaxies)

       The Faint Object Spectrograph (Blue Side) was used to make =
observations of the moderate redshifted galaxy/QSO 4C11.72 in order to =
study the damped Lyman-Alpha absorption lines which are located in the =
line of sight to the object.  In addition, the neutral H column density =
will be determined.  The observations were completed as planed and no =
problems were reported.

   1.13 Completed WF/PC-2 6253 (Pure Parallel Archive Program)

       The WF/PC-2 was used to execute a pure parallel program taking =
ultraviolet observations running concurrently with prime science =
observations.  The intent is to search for extra-galactic sources with =
flux excesses at 3000 A0 and galactic sources with excesses at 1600 A0.  =
The observations were completed as planned, and no problems were =
reported.

   1.14 Completed WF/PC-2 6642 (White Dwarf Companions to Binary Neutron =
Stars, Astrometric Frame Ties)

       The WF/PC-2 was used to make observations of the white dwarf star =
STAR-0437 in order to make comparisons of white dwarf star to its binary =
neutron star companion.  The main intent is to improve the correspondence =
between the optical and radio coordinate systems.  The observations were =
executed as scheduled, and no anomalies were noted.

   1.15 Completed WF/PC-2 5927 (Nuclear Disks in Radio Galaxies)

       The WF/PC-2 was used to make observations of the radio galaxy =
3C264 in order to study its nuclear disk.  This will be used to establish =
the morphology and characteristics of the disk, and the alignment of the =
disk with the radio jet.  The observations were executed as scheduled, =
and no anomalies were noted.

   1.16 Completed WF/PC-2 6099 (Black Holes and Cores of Galaxies)

       The WF/PC-2 was used to search for possible black holes in the =
cores of nearby early-type galaxy NGC-3608.  The WF/PC-2 will be used to =
obtain accurate coordinates for the FOS, which will be used to measure =
the velocity dispersion around selected galaxies.  The observations were =
executed as scheduled, and no anomalies were noted.

   1.17 Completed FOS/BL 6781 (Soft X-Rays and the UV Spectra of a =
Complete QSO Sample)

       The Faint Object Spectrograph (Blue Side) was used to obtain =
ultraviolet spectra of the low-Z quasi-stellar object PG1115+407.  The ion=
ization continuum of this object has been studied using the ROSAT =
satellite.  The strengths and line profiles of strong and weak =
ultraviolet emission and absorption lines and the ultraviolet continuum =
were studied.  The observations were completed as planned and no =
anomalies were reported.

   1.18 Completed WF/PC-2 6684 (WF/PC-2 Imaging of 2 JY Radio Galaxies)

       The WF/PC-2 was used to make observations of the radio galaxy =
6C0943+39 from the 6C catalog.  These data will be used to look for a =
correlation of optical structures with known radio luminosity.  If such a =
correlation exists, then it will allow the importance of the radio beam =
power to the optical structure to be quantified.  The observations were =
executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 17
                                        Successful : 17

                          Scheduled Reacquisitions : 28
                                        Successful : 28

   2.2 FHST Updates: 

                              Scheduled : 24
                             Successful : 24

   2.3 Operations Notes: 

       A quiet weekend was experienced by operations personnel.  No signif=
icant problems were reported.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

        Nothing at this time.

/DMH