HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1642

PERIOD COVERED:  0000Z (UTC) 05/24/96 - 0000Z (UTC) 05/28/96

Daily Status Report as of 149/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed WF/PC-2 6785 (Ionized Gas Disks in Nearby Early Type =
Galaxies)

       The WF/PC-2 was used to make observations of the nearby early type =
galaxy NGC-2328 in order to study its ionized gas disk surrounding its =
nucleus.  Finding such disks could lead to the possibility of detecting =
the gravitational effects of the supermassive black holes they orbit.  =
The observations were executed as scheduled, and no anomalies were noted.

   1.2 Completed FOS/96 6309 (Determining the SED of an Ultraviolet Flare =
at the Center of an Elliptical Galaxy.)

       The Faint Object Camera (f/96) was used to make observations of an =
ultraviolet flare at the center of the elliptical galaxy NGC-4552 which =
brightened in luminosity from 1991 to 1993 by over a factor of seven.  =
The purpose of the observations is to measure the spectral energy =
distribution (SED) of this flare.  The observations were executed as =
scheduled, and no anomalies were noted.

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

       The WF/PC-2 was used to make observations of the galaxies NGC-4535 =
and NGC-4548 to be used in measuring the periods of Cepheid variable =
stars within these galaxies.  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.

   1.4 Completed WF/PC-2 5962 (Young Globular Clusters in Merging =
Galaxies: Part III)

       The WF/PC-2 was used to make observations of two merging galaxies =
(aka, NGC-4038/4039) in order to study their compact young blue globular =
clusters to determine their age, luminosity function, and physical =
properties.  The observations were executed as scheduled, and no =
anomalies were noted.

   1.5 Completed Two Sets of WF/PC-2 6359 (Core Properties of the Bulges =
of Spiral Galaxies)

       The WF/PC-2 was used to make snapshot survey observations of =
spiral galaxies NGC-2758 and NGC1892 in order to study their central =
bulges.  The aim is to investigate the core properties, correlations with =
global galactic properties, and the frequency of occurrence of multiple =
and/or miscentered nuclei.  The observations were completed as scheduled, =
and no anomalies were noted.

   1.6 Completed GHRS/2 5874 (UV Echoes in X-Ray Pulsars: LMC X-4)

       The High Resolution Spectrograph (Side Two) was used to make rapid =
mode observations of the ultraviolet echoes off of the x-ray binary =
pulsar 4U0532-664 (aka, Large Magellanic Cloud X-4).  X-ray emissions in =
x-ray binaries cause ultraviolet florescence in the accretion disks.  =
Simultaneous observations will be obtained with the ASCA satellite.  The =
FHST update immediately prior to the beginning of this proposal failed,  =
Otherwise, the observations were completed as planned, and no problems =
were reported.

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

       The WF/PC-2 was used to make a series on 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.

   1.8 Completed WF/PC-2 6483 (HST Observations of Galaxies in a Close, =
Nonmerging Encounter)

       The WF/PC-2 was used to make observations of the galaxies NGC-2207 =
and IC2163, nearby galaxies in a close nonmerging encounter.  These data =
will help clarify how interactions cause shocks, trigger star formation, =
and possibly make bars.  The observations were completed as scheduled, =
and no problems were noted.

   1.9 Completed FOS/BL 6166 (FOS Cycle 5: Location of Spectra and =
Wavelength Calibration)

       The Faint Object Spectrograph (Blue Side) was used to make =
wavelength calibration images to measure the stability of the FOS Blue =
Side wavelength scale and spectral locations.  A Taled calibration =
observation was also taken.  The observations were completed as planned, =
and no anomalies were reported.

   1.10 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 objects Q0056-002 and Q0045-036.  This is to determine =
if this high redshifted objects have a far ultraviolet flux.  The =
observations were executed as scheduled, and no anomalies were noted.

   1.11 Completed Five Sets of 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.=


   1.12 Completed FGS 6264 (Parallax of RR-Lyrae)

       The FGSs were used to make astrometric observations of the =
variable star RR-Lyrae in order to measure its parallax.  RR-Lyrae is the =
proto-type for a class of variable stars whose pulsation periods =
correlate with their absolute magnitudes.  The observations were =
completed as planned, and no problems were reported. 

   1.13 Completed Two Sets of FOS/RD 6165 (FOS Cycle 5: Discriminator =
Test)

       This is a calibration proposal, which is being used to verify the =
optimal discriminator settings for the FOS.  The observations were =
executed as scheduled, and no anomalies were noted.

   1.14 Completed WF/PC-2 6338 (Colors, Parallax and Orbit of GL229B)

       The WF/PC-2 was used to observe HD42581-B, a recently discovered =
companion to the M-dwarf star HD42581-A.  Methane has been detected in =
the spectrum of HD42581-B, and the evidence suggests that it has a mass =
of only 20 Jupiter masses, and a temperature of less than 1000 K.  The =
WF/PC-2 will obtain astrometric and photometric data of HD42581-B, and =
will also search for other possible companions.  The observations =
completed as scheduled, and no problems were reported.

   1.15 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 PG1116+215.  The =
ionization 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.

   1.16 Completed WF/PC-2 6363 (The Environments and Host Galaxies of =
BL-Lac Objects)

       The WF/PC-2 was used to make snapshot survey observations of =
BL-Lac object 2A1218+304 in order to study its environment and its host =
galaxy.  The goal is to investigate systematic trends in host galaxy =
type, unusual morphological features, nearby companion galaxies, etc.  =
The observations were executed as scheduled, and no anomalies were noted.

   1.17 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 PG1338+416 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.

   1.18 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 =
core of nearby early-type galaxy NGC-4473.  The WF/PC-2 will be used to =
obtain high resolution images of it to identify its bright core, and to =
provide sufficiently accurate coordinates for the FOS, which will be used =
to measure the velocity dispersion around selected galaxies.  The observat=
ions were executed as scheduled, and no anomalies were noted.

   1.19 Completed FGS 6271 (L726-8/UV Ceti)

       The FGSs were used to make astrometric observations of the binary =
star L726/UV Ceti to search for a short period low-mass companion around =
either component of this binary object.  The observations were executed =
as scheduled, and no anomalies were reported.

   1.20 Completed WF/PC-2 6183 (WF/PC-2 Cycle 5 Calibration: Decon)

       The WF/PC-2 was used to make some internal flat, K-Spot, and dark =
calibration images.  The purpose is to define decontamination procedures =
to be run during Cycle 5.  The calibration observations were completed as =
scheduled, and no anomalies were reported.

   1.21 Completed FOS/RD 6704 (Dust in the Broad-Lined Regions of Seyfert =
Galaxies)

       The Faint Object Spectrograph (Red Side) was used to make =
observations of the Seyfert galaxy MRK423 in order to study dust in its =
broad-line regions.  The observations were completed as planned, and no =
problems were reported.

   1.22 Completed WF/PC-2 6184 (WF/PC-2 Cycle 5 Photometric Calibration =
Monitor UV/OPT STD)

       The WF/PC-2 was used to make ultraviolet and optical observations =
of standard star GRW+70D582 in order to monitor the photometric =
calibrations of the camera and to check for decontamination.  The =
observations were executed as scheduled, and no anomalies were noted.

   1.23 Completed GHRS/2 6493 (Accretion in the Interacting Binary UX =
Monoceros)

       The High Resolution Spectrograph (Side Two) was used to make =
observations of the accretion in the interacting contact binary star =
system HD65607 (aka, UX Monoceros).  The observations were completed as =
scheduled, and no problems were reported. 

   1.24 Completed WF/PC-2 6439 (Using Cepheid Based Distance to Test =
Large Peculiar Motions)

       The WF/PC-2 was used to make observations of object NGC-4603 to =
look for Cepheid variable stars to be used to measure the distance to the =
object, which in turn will be used to study its large peculiar motions.  =
The observations were executed as scheduled, and no anomalies were =
reported.

   1.25 Completed FGS 6047 (Calibrating the Mass Luminosity Relation at =
the End of the Main Sequence)

       The FGSs were used to make astrometric observations of star GL748 =
as part of a study to determine its mass luminosity relationship.  The =
purpose is to measure the precise parallax and relative orbit of its =
faint companion.  The observations were completed as planned, and no =
problems were reported.

   1.26 Completed FOS/RD/BL 6017 (Soft X-Ray Transients, Outburst in =
Black Hole Accretion Disks)

       The Faint Object Spectrograph (Both the Blue and Red Sides) were =
used to make target of opportunity observations of the cataclysmic =
contact-binary star J1655-40 which is known to show soft X-ray =
transients.  These outbursts are believed to be caused by the accretion =
disk surrounding a black hole.  The observations were completed as =
scheduled, and no problems were reported. 

   1.27 Completed WF/PC-2 6189 (WF/PC-2 Cycle 5 Calibration: Internal =
Monitor - Vis Flats)

       The WF/PC-2 was used to make internal visual flat calibration =
images.  Both photometric and narrow-band filters were used.  The =
observations were executed as planned, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 30
                                        Successful : 30

                          Scheduled Reacquisitions : 29
                                        Successful : 29

   2.2 FHST Updates: 

                              Scheduled : 45
                             Successful : 43

       There were update failures at 145/2212Z and 148/0704Z.

   2.3 Operations Notes: 

       No poly errors were reported during ESTR operations.

       One TTR was written to document a late acquisition att 148/1200Z =
due to bad ephemeris at STGT.


3.0 SIGNIFICANT FORTHCOMING EVENTS: 

        GSFC Simulation #5 (Deploy) will be conducted on Thursday.

/DMH