HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1865

PERIOD COVERED:  0000Z (UTC) 04/25/97 - 0000Z (UTC) 04/28/97

Daily Status Report as of 118/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Four Sets of WF/PC-2 7553 (Pure Parallel Archive Survey =
II)

       WF/PC-2 parallel observations were obtained in the ultraviolet in =
search for interesting objects.  This program is designed to find =
extragalactic sources with near ultraviolet excesses (3000 A0) outside =
the galactic plane and far ultraviolet sources (1600 A0) in the galactic =
plane.  The procedure was executed as scheduled, and no anomalies were =
reported. 

   1.2 Completed Two Sets of WF/PC-2 6361 (High Resolution Imaging of =
X-Ray Selected AGNs)

       The WF/PC-2 was used to make high resolution  observations of the =
known, low, red-shifted, x-ray active, galactic nuclei (AGN) MS0516.-4 =
and MS0849.5+0.  These data will allow a study of the optical properties =
of an unbiased sample of AGN host galaxies.  The observations were =
completed as scheduled, and no problems were reported.

   1.3 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 QDOTULIR06.  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.

   1.4 Completed NIC/1/2/3 7050 (NICMOS Differential Photometry Test)

       The Near Infrared Cameras (NIC One, Two and Three) were used to =
make observations of standard test star P330E as part of a differential =
photometric test.  This is a inter-camera photometric precision and stabil=
ity test, obtained from observations of the standard star at 25 =
positions, in each camera.  The observations were executed as scheduled, =
and no anomalies were noted. 

   1.5 Completed NIC/1/2/3 7051 (NICMOS Detector Noise and Dark =
Characterization - Non-Occulted)

       The Near Infrared Cameras (NIC One, Two and Three) were used to =
make detector noise and dark chacturizational calibration observations.  =
The purpose of this proposal is to characterize NICMOS read noise and =
dark current for the three cameras, and to verify the stability since =
SLTV and measurements of the cosmic ray event outside SAA.  The =
observations were completed as planned, and no problems were reported.
 
   1.6 Completed NIC/1/2/3 7048 (NICMOS Parallel Thermal Background Test)

       The Near Infrared Cameras (Cameras One, Two and Three) were used =
to make observations of an object designated as Target-1 in order execute =
measurements of the stability of the HST thermal emissions.  The =
observations were executed as scheduled, and no problems were reported. 

   1.7 Completed Two Sets of NIC/1/2/3 7045 (NICMOS Persistence Test)

       The Near Infrared Cameras (NIC One, Two and Three) were used to =
make observations of standard star HD106965 in order to measure the =
system's persistence.  This test measures the effects of severe =
over-exposure of the NICMOS detectors to determine if operational =
limitations are required for programs expecting such over exposures.  It =
also obtained data on the extreme wings of the NICMOS PSF.  Dark calibrati=
on observations were also taken.  At the beginning of the first iteration =
of this proposal, the guide star acquisition defaulted to fine lock on =
FGS 2 only when the scan search limit was exceeded.  HSTAR 6045 was =
written.  Near the beginning of the second iteration, the acquisition =
similarly defaulted, but to FGS 3.  HSTAR 6047 was written.  Otherwise, =
the observation completed as planned, and no further problems were =
reported. 

   1.8 Completed Two sets of WF/PC-2 6903 (WF/PC-2 Cycle 6 Calibration: =
Decontamination)

       The WF/PC-2 was used to make several calibration bias =
observations, internal flats, K-Spot images and dark calibration images =
which are all part of a Cycle 6 decontamination procedure.  No science =
was interleaved with the dark exposures.  The observations were completed =
as scheduled, and no problems were reported.

   1.9 Completed STIS/CCD 7123 (MAMA and CCD Spectroscopy of SN1987A)

       The Space Telescope Imaging Spectrograph (CCD) was used to make =
observations of the super-nova remnant LMC-SN1987 which is located in the =
Large Magellanic Cloud.  This is to study SN-1987A and its nebula by =
taking spectra at both ultraviolet and optical wavelengths to obtain a =
spatially resolved map of the debris and the circumstellar rings.  A =
waveline calibration image was also taken.  The observations were =
completed as planned, and no anomalies were reported.

   1.10 Completed WF/PC-2 7029 (WF/PC-2 Cycle 6/SMOV Lyman-Alpha =
Check-Part 2)

       The WF/PC-2 was used to make observations of WD0310-688 in order =
to obtain far-ultraviolet (Lyman-Alpha) measures of the system's =
throughput.  This is to quantify any contamination of the WF/PC-2 =
pick-off mirror caused by SMOV activities.  The observations were =
completed as planned, and no anomalies were reported.

   1.11 Completed NIC/1/2/3 7043 (NICMOS Focus Monitor)

       The Near Infrared Cameras (Cameras One, Two and Three) were used =
to make observations of NGC-3603 in order to make focus calibration and =
monitoring measurements.  This proposal is built to run NIC/1/2 focus =
sweeps on a weekly
basis, and NIC/3 focus sweeps twice a week during SMOV.  The observations =
were executed as scheduled, and no anomalies were noted.

   1.12 Completed WF/PC-2 6770 (Resolving the Nature of Nova Shells)

       The WF/PC-2 was used to make images of the post-nova remnant =
BT-Mon in order to study its surrounding shells structure.  Past data has =
indicate a strong correlation between nova speed class and the =
ellipticity of the resulting remnants.  The observations were completed =
as scheduled, and no problems were noted. 

   1.13 Completed NIC/2 7154 (NICMOS Coronographic Hole Monitor)

       The Near Infrared Camera (NIC 2) was used to make observations of =
object NGC-3606 in order to monitor the effects of coronagraphic hole.  =
The purpose of this proposal is to take lamp flats with camera 2 (and =
cameras 1 and 3 occasionally) to monitor the location of the =
coronographic spot.  The observations were completed as scheduled, and no =
anomalies were reported. 

   1.14 Completed WF/PC-2 7590 (Cosmological Parameters Omega and Lambda =
>From High-Redshift Type IA Supernovae)

       The WF/PC-2 was used to make observations of type 1A supernova =
SN9784 in order to study its redshift.  The HST was used to make direct =
measurements of the cosmological parameters Omega, Lambda, and curvature =
(Omega_k) using Type 1A supernovae (SNe 1a) as a calibrated "standard =
candle".  The observations were executed as scheduled, and no anomalies =
were noted.

   1.15 Completed FGS 6878 (Parallax of NGC-6853)

       The Fine Guidance Sensors were used to make astrometric =
observations of stars located in NGC-6853.  NGC-6853 is one of the =
closest planetary nebulae.  Its trigonometric parallax is presently only =
poorly known.  HST observations have the potential to reduce the parallax =
uncertainty to about 0.0005 arcsec.  The observations were completed as =
scheduled, and no anomalies were reported. 

   1.16 Completed WF/PC-2 6587 (Black Holes and Cores of Early-Type =
Galaxies)

       The WF/PC-2 was used to make observations of early-type galaxy =
IC4329 in order to study its nuclear core region and its possible black =
hole.  The campaign to find black holes in the centers of galaxies using =
HST has so far been highly successful.  The observations were completed =
as planned, and no problems were reported. 

   1.17 Completed NIC/1/2/3 7110 (NICMOS Detector Noise and Dark =
Characterization - Non Nominal)

       The purpose of this proposal is to characterize NICMOS read noise =
and dark current for the three cameras.  Verification of the stability =
since SLTV and measurements of the cosmic ray event outside SAA were also =
be performed.  The observations were executed as scheduled, and no =
anomalies were reported. 

   1.18 Completed WF/PC-2 6194 (WF/PC-2 Cycle 5: Polarization Proposal)

       The WF/PC-2 was used to make polarization observations of star =
GRW+70D582 at four different spacecraft roll angles.  This should permit =
a detailed and independent calibration of each polarizer quad.  The =
observations were executed as scheduled, and no anomalies were noted. 

   1.19 Completed FOC/96 6426 (A Search for Multiple Images of QSOs Seen =
Through Damped Ly-Alpha Absorbers)

       The Faint Object Camera (f/96) was used to make observations of =
QSO PG0000-263.  The propose of these observations is to obtain =
high-resolution images of a sample of QSOs with strong damped Lyman-Alpha =
absorption in their spectra.  The observations should determine whether =
these QSOs are multiply imaged by gravitational lensing.  The =
observations were completed as planned, and no problems were reported. 

   1.20 Completed NIC/3 7047 (NICMOS Pointed Thermal Background Test)

       The Near Infrared Camera (Camera Three) was used to conduct a =
series of tests for the measurement of the stability of the HST thermal =
emissions, through a series of pointed observations.  Two hours into this =
sixteen-hour proposal, at 117/0830Z, there were losses of lock that =
lasted for a period of 20-minutes.  HSTAR 6048 was written.  The =
observations was completed as planned, and affect on science was =
reported. 

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 18
                                        Successful : 18

       At 115/221616Z and 116/173816Z, the acquisition defaults described =
in 1.7 occurred.

                          Scheduled Reacquisitions : 20
                                        Successful : 20

       There were six to eight losses of lock as described in 1.20. 

   2.2 FHST Updates: 

                              Scheduled : 50
                             Successful : 50

   2.3 Operations Notes: 

       STIS was commanded to operate at 115/2348Z with the CCD test and =
the MAMA off.

       The memory monitor for the STIS CCD was patched at 115/1815Z.  =
Other DF and NSSC-1 memory monitors were patched at 115/2047Z.  There =
were NSSC-1 and DF safing sequence patches uplinked at 115/2133Z.

       Several low voltage power supplies were turned off at 116/2041Z.

       STIS event flag 10 was set at 118/0115Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science and SMOV operations.

/DMH