HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1863

PERIOD COVERED:  0000Z (UTC) 04/23/97 - 0000Z (UTC) 04/24/97

Daily Status Report as of 114/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed NIC/3 7043 (NICMOS Focus Monitor)

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

   1.2 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. 

   1.3 Completed NIC /3 7055 (NICMOS Grism Validation)

       The Near Infrared Camera #3 was used to make observations of the =
object K4-47 in order to perform validation of the operations of the =
three NICMOS grisms and supply the initial level of calibration for =
spectroscopic observations.  The observations were completed as planned =
and no problems were reported. 

   1.4 Completed FOC/96 6894 (Cycle 6: Aperture Monitor Location)

       The Faint Object Camera (f/96) was used to make observations of =
selected targets in NGC-188 in order to monitor the location of the =
camera's aperture with respect to the V2-V3 coordinate frame.  The =
observations were completed as planned, and no problems were reported.

   1.5 Completed WF/PC-2 6480 (The Butcher-Oemler Effect: Where Have All =
The Spirals Gone?)

       The WF/PC-2 was used to make observations of the blue disk-type =
galaxy A851-POS1 in order to study the Butcher-Oemler effect.  Other =
observational data show that mergers and tidal interactions were apparentl=
y more common in younger clusters; these may contribute to the =
disappearance of spiral galaxies by the present epoch.  The observations =
were executed as scheduled, and no anomalies were noted. 

   1.6 Completed WF/PC-2 6902 (WF/PC-2 Cycle 6 Photometric Calibration =
Monitor UV/OPT STD)

       The WF/PC-2 was used to make both ultraviolet and optical =
photometric observations of the standard star GRW+70D582 as part of a =
Cycle 6 calibration procedure.  This observations was done immediately =
before and after decontamination procedures.  The observations were =
completed as planned, and no problems were reported. 

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

       The Near Infrared Cameras (NIC 1, 2 and 3) were used to detector =
noise and dark characterizational calibration observations.  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.  The observations were =
completed as planned, and no problems were reported.
 
   1.8 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.  The =
observations were executed as scheduled, and no problems were reported. 

   1.9 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 coronagrapghic hole.  =
The purpose of this proposal is to take lamp flats with camera 2 to =
monitor the location of the coronographic spot.  The observations were =
completed as scheduled, and no anomalies were reported. 

   1.10 Completed NIC/1/2/3 7045 (NICMOS Persistence Test)

    The Near Infrared Cameras (NIC 1, 2 and 3) were used to make =
observations of standard star HD106965 in order to measure the system's =
persistence.  This test measures the effects of severe overexposure 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 calibration observations were also =
taken.  The guide star acquisition for this proposal (at 113/232959Z) =
defaulted to fine lock on FGS #2 when the search limit was exceeded on =
FGS #3.  HSTAR 6044 was written.  The observations were completed as =
planned, and no affects on science were reported. 

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 4
                                        Successful : 4

       As described in 1.10, one acquisition defaulted to fine lock on =
one FGS only.

                          Scheduled Reacquisitions : 4
                                        Successful : 4

   2.2 FHST Updates: 

                              Scheduled : 8
                             Successful : 8

   2.3 Operations Notes: 

       The battery #2 capacity check is continuing.

       Four gyro configuation was successfully commanded at 113/2147Z and =
the associated PRS operational limits were adjusted.

       STIS flight software version 4.6 was installed, with the MAMA 1 =
and 2 off, at 113/2313Z.  STIS was suspended at 113/2314Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science and SMOV operations.

/DMH