HUBBLE SPACE TELESCOPE
                       DAILY REPORT #1864

PERIOD COVERED:  0000Z (UTC) 04/24/97 - 0000Z (UTC) 04/25/97

Daily Status Report as of 115/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Three Sets of NIC/1/2/3 7056 (NICMOS Scattered Light =
Determination)

       The Near Infrared Cameras (NIC One, Two and Three) were used to =
make observations of standard star HD106965 in order to measure scattered =
light in the cameras.  This is to measures scattered light effects =
produced in the cameras by the presence of a bright red star located few =
to several seconds of arc away from the field of view.  Just before the =
last iteration of this proposal, the FHST update failed.  However, all =
observations were executed as scheduled, and no effect on science was =
noted. 

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

       The Space Telescope Imaging Spectrograph (CCD) was used to make =
observations of standard star GD153 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. =


   1.4 Completed 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.

   1.5 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 =
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, 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.
 
   1.6 Completed FGS 6876 (Parallax of RR-Lyrae)

       The FGSs were used to make astrometric observations of the =
variable star RR-Lyrae.  RR Lyrae is the prototype of a class of stars =
that provide a fundamental stepping stone for the astronomical distance =
scale.  Its trigonometric parallax is presently known to be around 0.0042 =
+/- 0.0019 arcsec for a distance modulus of 6.86 +/- 0.6 mag.  It is the =
only star of this class with the parallax range of HST.  The observations =
were completed as planned, and no problems were reported. 

   1.7 Completed 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 nucleus (AGN) MS1846.  =
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.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 6
                                        Successful : 6

                          Scheduled Reacquisitions : 6
                                        Successful : 6

   2.2 FHST Updates: 

                              Scheduled : 15
                             Successful : 14

       The update at 114/2323Z failed.

   2.3 Operations Notes: 

       The Battery #2 capacity test was completed.  Results are not =
currently available.

       STIS was commanded to operate and the CCD was powered on at =
114/2300Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of normal science and SMOV operations.

/DMH