HUBBLE SPACE TELESCOPE
                       DAILY REPORT #1861

PERIOD COVERED:  0000Z (UTC) 04/21/97 - 0000Z (UTC) 04/22/97

Daily Status Report as of 112/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Seven Sets of  FGS/S/C 7001 (FGS 1 Delta Mini-OFAD =
Post-SM2 Calibration)

       The FGS #1 was used to make astrometric observations of stars =
OF49, OF56, OF42, OF94, OF80, et al., as part of delta mini-OFAD post-SM2 =
calibration.  This calibration will return the knowledge of the OFAD to =
within an arbitrary scale factor, to a level of accuracy sufficient to =
support the calibration.  The observations were executed as scheduled, =
and no anomalies were noted. 

   1.2 Completed Seven Sets of 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. 

   1.3 Completed Ten 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. 

   1.4 Completed S/C 5582 (FOC/48 Monthly Activation (Camera Section =
Only): Cycle 4) 

        This proposal was executed as scheduled, and no anomalies were =
noted. 

   1.5 Completed FGS 6538 (The Distances to Dwarf Novae, and the =
Calibration of the Technique of Infrared Spectroscopic Parallax)

       The FGSs were used to make astrometric observations of the Dwarf =
Novae U-Gem and several other reference stars in order to measure its =
distance from its parallax.  The distance to this dwarf novae is poorly =
known.  This deficiency severely impacts our ability to quantify the =
energetics of the various processes taking place in dwarf novae systems.  =
The observations were executed as scheduled, and no anomalies were noted. =


   1.6 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 PG0935+417.  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 multiple-imaged by gravitational =
lensing.  The observations were completed as planned, and no problems =
were reported. 

   1.7 Completed NIC/1/2/3 7048 (NICMOS Parallel Thermal Background Test)

       The Near Infrared Cameras (Cameras 1, 2 and 3) were used to make =
observations of an object designated as Target-1 in order execute =
measurements of the stability of the HST thermal emissions.  A guide star =
re-acquisition, scheduled at 111/114821Z, failed and the take data flag =
remained down for the remainder of the observations.  HSTAR 6039 was =
written.  The observations were executed as scheduled, and no problems =
were reported. 

   1.8 Completed NIC/1/2/3 7023 (FGS 2 Delta Mini OFAD Post-SM2 =
Calibration)

       Observations of stars M255, M267, M276, M293, M320, et al. were =
used to calibrate the changes to the optical field angle distortions =
(OFAD) of FGS unit #2 that resulted from the servicing mission.  This =
calibration will return the knowledge of the OFAD to within an arbitrary =
scale factor, to a level of accuracy sufficient to support the =
calibration.  The actual solutions will provide the Project Data Base =
with significant terms, their values, and their covariances, including =
errors, which may then be applied to general FGS observations to reduce =
them for field angle distortions, except for scale, alignment, and color =
corrections.  The guide star acquisition at 111/210359Z failed to fine =
lock on FGS #3 only when the scan search limit was exceeded.  HSTAR 6041 =
was written.  The remaining operations were executed as scheduled, with =
no further anomalies being reported.  Any possible effect on science has =
not been communicated.

   1.9 Completed WF/PC-2 6906 (WF/PC-2 Cycle 6 Calibration: Internal =
Monitor-Visual Flats)

       The WF/PC-2 was used to make internal calibration visual flat =
images as part of the Cycle 6 internal monitoring of the instrument's =
operations.  This proposal defines the standard series of internal flat =
fields, which will be executed twice per month.  The observations were =
completed as planned, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 12
                                        Successful : 11

       A default to fine lock backup on one FGS is described in 1.8.

                          Scheduled Reacquisitions : 2
                                        Successful : 1

       A re-acquisiton failure is described in 1.7.


   2.2 FHST Updates: 

                              Scheduled : 10
                             Successful : 10

   2.3 Operations Notes: 

       The Battery #2 capacity test is ongoing.  Discharge began at =
111/1857Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science and SMOV operations.

/DMH