HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1617

PERIOD COVERED:  0000Z (UTC) 04/19/96 - 0000Z (UTC) 04/22/96

Daily Status Report as of 113/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed WF/PC-2 6364 (Snapshot Survey of Proto-Planetary Nebulae =
and AGB Stars)

       The WF/PC-2 was used to make some snapshot survey observations of =
protoplanetary nebular system IRAS20028 to study its circumstellar =
envelope. The purpose is to discern the evolutionary sequence that =
produces axially-symmetric planetary nebulae. The observations were =
executed as scheduled, and no anomalies were noted.

   1.2 Completed WF/PC-2 5983 (Curcumstellar Disks in Young Nebulous =
Clusters)

       The WF/PC-2 was used to make observations of the young nearby =
nebulous cluster NGC-2264 looking for possible curcumstellar disks (Solar =
nebula analogs), like the type seen in the Orion Nebula. The observations =
were completed as planned, and no problems were reported.

   1.3 Completed WF/PC-2 6117 (Fliers in Planetary Nebulae)

       The WF/PC-2 was used to make observations of planetary NGC-3242 in =
order to look for fliers. A flier is plasma knot embedded within highly =
ionized elliptical and bipolar planetary nebulae. The observations were =
executed as scheduled, and no anomalies were noted

   1.4 Completed WF/PC-2 6187 (WF/PC-2 Cycle 5 Calibration: Earth Flat)

       The WF/PC-2 was used to make Earth streak flat calibration images. =
These streak flats will be used to produce flat fields, to map the OTA =
illumination pattern and, in combination with other data, to produce new =
superflats. The observations were completed as planned, and no problems =
were reported.

   1.5 Completed WF/PC-2 6107 (Dynamics and Ages of Nuclear Stellar Disks =
in Virgo E/S0 Galaxies)

       The WF/PC-2 was used to make observations of the E/S0 class galaxy =
NGC-4570 which is located in the Virgo Cluster in order to study its age =
and its thin nuclear stellar disk. The images will also be examined for =
population differences between the disk and that of the host galaxy. The =
observations were completed as planned, and no anomalies were reported.

   1.6 Completed Two Sets of 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. The observations were completed as planned, and no anomalies =
were reported.

   1.7 Completed WF/PC-2 6346 (Snapshot Survey of the Ultraluminous IRAS =
Galaxy Sample-Part 1 High)

       The WF/PC-2 was used to make snapshot survey observations of the =
ultraluminous IRAS galaxy IR09425+17. These data will be searched for =
multiple cores, which imply a merger has occurred, and for starburst =
regions. The observations were executed as scheduled, and no anomalies =
were noted.

   1.8 Completed WF/PC-2 6096 (NGC-2363: Anatomy of a Two- Stage Star =
Burst)

       The WF/PC-2 was used to make observations of the two Stage star =
bursting region (NGC-2363) located in galaxy NGC-2366. This H II region =
is associated with two star clusters that ionize the gas and supply the =
kinetic energy to the nebula. A FOS STB message FOS 3202 was received =
after a FOS Mode 2 target acquisition failur at 110/1508Z. HSTAR 5570 was =
written. No other problems were reported.

   1.9 Completed Three 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.

   1.10 Completed WF/PC-2 5971 (HST Medium Deep Survey)

       The WF/PC-2 was used to make a long exposure medium deep sky =
survey observations at latitudes larger than 10 degrees taken in parallel =
with the prime science observations. The observations were executed as =
scheduled, and no anomalies were noted.

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

       The WF/PC-2 was used to make observations of the radio galaxy =
3C442 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.

   1.12 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.

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

       The FGS 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.

   1.14 Completed WF/PC-2 6778 (HST Observations of a "Clusterless" Giant =
Arc centered on 3C220.1)

       The WF/PC-2 was used to make observations of the radio galaxy =
3C220.1 in order to study its "clusterless" gravitationally lensed giant =
arc which is centered on the galaxy. While the arc suggests a very large =
lensing mass, imaging data indicate that the radio galaxy is situated in, =
at most, a very poor group of galaxies. There was a guide star =
acquisition which failed to fine lock at 111/0642Z. WF/PC-2 observations =
230 through 235 and observations 2-11 were impacted. HSTAR 5571 was =
written. No other problems were reported.

   1.15 Completed Two sets of 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 =
galaxies NGC-4872 and IC4051 which are located in the Coma Cluster. The =
purpose is to study the luminosity profiles in the central nuclear =
regions. There was a primary guide star acquisition  failure at =
122/1438Z. The FHST had full maneuver updates prior to the acquisition. =
The next primary guide star acquisition also failed at 1502Z. An HLGBU =
was uplinked at 1549Z. The WF/PC-2 observations 21 and 22 were taken on =
gyros only. There was a second primary guide star acquisition which =
failed to FGS 3 fine lock once at 112/1502Z.  FGS #1 attained CT 16 times =
before flagging the search radius exceeded, but never attained fine lock. =
HSTARs 5576 and 5577 were written. No other anomalies were noted.

   1.16 Completed Two Sets of WF/PC-2 5994 (HST Images of New Candidates =
For Distant Proto-Ellipticals)

       The WF/PC-2 was used to make an observation of blue compact =
galaxies SA57-1501 and SA57-10601 in order to measure their size, light =
profiles, and color. The observation was executed as scheduled, and no =
anomalies were noted.

   1.17 Completed FGS 6036 (Detection and Mass Determination of Low Mass =
Companions to nearby M Dwarf)

       The FGSs were used in both the POS and TRANS Modes to make =
astrometric observations of low mass companions to M class dwarf star =
GL791 and four reference stars. This will lead to a mass determination =
for the stars. The observations were completed as planned, and no =
anomalies were noted.

   1.18 Completed GHRS/2 6178 (Composition of Gas in Individual =
Interstellar Clouds: Cycle 5 GTO Observations)

       The High Resolution Spectrograph (Side One) was used to make =
spectrographic observations of the interstellar gas clouds located in the =
line of sight to star HD149881, which is located in the galactic disk. =
The observations were executed as scheduled, and no anomalies were noted.

   1.19 Completed WF/PC-2 5953 (Galactic Bulge Studies: A Deep UV Survey)

        The WF/PC-2 was used to make ultraviolet observations of the UV =
bright stars in area BWUV-1 in order to perform a survey of the galactic =
halo luminosities, effective temperatures, and star counts per unit of =
luminosity. The observations were completed as planned, and no problems =
were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 19
                                        Successful : 16

       112/1438Z, 112/1502Z (HSTARs 5576 and 5577, see item 1.15 in =
today's report) , and 113/0231Z ( HSTAR 5578, see tomorrow's report)

                          Scheduled Reacquisitions : 18
                                        Successful : 18

   2.2 FHST Updates: 

                              Scheduled : 32
                             Successful : 32

   2.3 Operations Notes: 

       Started parallel operations using PDB43.C/PRS 8.1 and PDB 44.B/PRS =
9.2 at 111/0130Z. No problems were incountered.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

        Nothing at this time.

/DMH