HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1840

PERIOD COVERED:  0000Z (UTC) 03/21/97 - 0000Z (UTC) 03/24/97

Daily Status Report as of 083/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed STIS/CCD 7092 (CCD Dark Rate and Read Noise)

       Observations were taken to measure CCD dark current and gather =
data for making super darks.  The observations were completed as planned, =
and no anomalies were reported. 

   1.2 Completed STIS/CCD 7063 (STIS SMOV CCD Contamination Monitor)

       The Space Telescope Imaging Spectrograph CCD was used to make =
observations of standard star G191B2B in order to  measure flux and look =
for any gross changes over time that might indicate contamination.  The =
observations were completed as scheduled, and no anomalies were reported. =


   1.3 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.

   1.4 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) MS0818.8+5 =
and MS1112.5+4.  These data will allow a study of the optical properties =
of an unbiased sample of AGN host galaxies.  As detailes in 2.1, the =
acquisition for the second iteration of this proposal failed.  Otherwise, =
the observations completed as scheduled, and no further problems were =
reported.

   1.5 Completed WF/PC-2 7016 (WF/PC-2 SM97 UV Monitor And Cool Down =
Procedure)

       This operation was used as a post-SM97 cooldown of the WF/PC-2 CCD =
to -88C with frequent monitoring of contamination via standard star =
GRW+70D582 observations in filter F170W.  An internal flat and a dark =
calibration image were also taken.  The observations were completed as =
planed, and no problems were reported

   1.6 Completed Two Sets of NIC 1/2/3 7054 (NICMOS Thermal Check on =
COSTAR FOC Arm Deploy)

       The Near-Infrared Cameras 1/2/3 were used to make a thermal =
check-out of the COSTAR FOC deployed optical bench arm.  This is to =
verify that the COSTAR FOC arm does not contribute to the thermal =
background seen by NICMOS.  The observations were executed as scheduled, =
and no anomalies were noted. 

   1.7 Completed Two Sets of COSTAR/U FOC 7008 (COSTAR FOC M1/M2 Mirror =
Arm Deployment)

       The COSTAR's FOC M1/M2 arms were returned to their pre-servicing =
mission positions.  The WF/PC-2's shutter was closed during and for 30 min=
utes after the deployment of the FOC COSTAR arms.  The FOC arm deployment =
activities were executed with a combinations of real-time and stored =
commanding.  FOC M1/M2 arm deployments were not executed until the FOC =
baseline observations were performed.  No anomalies were reported.

   1.8 Completed Two Sets of WF/PC-2 6837 (The Ultraviolet Properties of =
"Dwarf" Seyfert 1 Nuclei)

       The WF/PC-2 was used to make ultraviolet observations of the =
"dwarf", type one, Seyfert galaxies NGC-3884 and NGC-3227.  This class of =
"dwarf" Seyfert populate the faint end of the local AGN luminosity =
function and hold important clues to the evolution of the entire AGN =
population.  The observations were completed as scheduled, and no =
problems were reported. 

   1.9 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 B2-1147+24 in order to study its environment and its host =
galaxies.  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.

   1.10 Completed FGS 6566 (Calibrating the Mass-Luminosity Relation at =
the End of the Main Sequence)

       The FGSs were used to make astrometric observations of the =
components of the low-mass, binary system, star GL-784 in order to make a =
calibrations of the mass-luminosity relation at the end of the main =
sequence.  Observations were also made of several other reference stars.  =
The individual stars have masses of less than 0.2 solar masses.  The =
observations were completed as scheduled, and no problems were noted. 

   1.11 Completed Three Sets of WF/PC-2 7022 (WF/PC-2 SM97 Monitor)

       This calibration proposal is the routine internal monitor for =
WF/PC-2, to be run twice weekly to monitor the health of the cameras.  A =
variety of internal exposures were obtained in order to provide a monitor =
of the integrity of the CCD camera electronics in both bays (gain 7 and =
gain 15), a test for quantum efficiency in the CCDs, an internal check on =
the alignment of the WF/PC-2 optical chain, and a monitor for possible =
buildup of contaminants on the CCD windows.  This observation was =
completed as scheduled, and no anomalies were noted.

   1.12 Completed FGS 6495 (The Mass of the Bright Giant HD173764)

      The FGSs were used to make astrometric observations of bright, =
spectrographic binary system, giant star HD173764 which has a 832 day =
period.  The objective is to determine the individual masses of the G4 =
and B9 class pair.  The observations were completed as scheduled, and no =
anomalies were noted.

   1.13 Completed FOC/96 7013 (FOC/96/FGS Alignment - Version 2)

       The Faint Object Camera (f/96) was used to make observations of =
the star cluster M-35.  This is to ensure that the V2-V3 position of the =
FOC F/96 aperture has not been significantly altered by the Second =
Servicing Mission activities.  The observations were executed as planned, =
and no problems were reported. 

   1.14 Completed WF/PC-2 6491 (The Optical Structure and Environments of =
Z~1 3CR Quasars)

       The WF/PC-2 was used to make observations of radio galaxy/ quasar =
3C208 in order to study its optical structure and environments.  This =
should obtain better statistics on correlations seen in the Cycle 4 data, =
such as the association of linear galaxies with other 3CR galaxies and =
quasars.  The observations were executed as scheduled, and no anomalies =
were noted.

   1.15 Completed WF/PC-2 6565 (Imaging of Proto-Planetary Nebulae)

       The WF/PC-2 was used to make high resolution observations of the =
proto-planeatary nebula IRAS16594 which is known to show bipolar =
morphologies in ground-based observations.  The observations were executed=
 as scheduled, and no anomalies were noted. 

   1.16 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 QDOTULIR18.  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.

   1.17 Completed WF/PC-2 6701 (Photometry of the Globular Cluster System =
of the Sagittarius Dwarf Galaxy)

       The WF/PC-2 was used to make observations of the globular cluster =
system Ter8 which is located the Sagittarius Dwarf Galaxy.  Isochrone =
fits to these data will yield the accurate age of this system.  As =
detailed in 2.1, both the acquisition and reacquisition for this proposal =
failed.  Otherwise, the observations completed as schedule, and no =
further anomalies were reported. 

2.0 FLIGHT OPERATIONS SUMMARY:


2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 15
                                        Successful : 13

       As recorded in HSTAR 5990, the acquisition at 081/235044Z failed =
to gyro control when the FGS-3 scan steps limit was exceeded.

       HSTAR 5991 details the acquistion and subsequent reacquisition =
failures at 082/201600Z and 082/222203Z respectively.  For each, the =
search radius limit was exceeded.

                          Scheduled Reacquisitions : 20
                                        Successful : 19

   2.2 FHST Updates: 

                              Scheduled : 26
                             Successful : 26

   2.3 Operations Notes: 

       Per HSTAR 5989, NICMOS, transitioned from boot to operate (in the =
SAA) at 081/164000Z.  However, the TPG1 clock stayed on and the detector =
1 temperature remained enabled.

       The NICMOS filter wheels were re-positioned at 081/1641Z.

       At 083/0144Z, the SSR was configured for continuous engineering =
record.  ESTR #2 remains powered on, but is not being used.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

    Nothing at this time.

/DMH