HUBBLE SPACE TELESCOPE

                       DAILY REPORT #1839

PERIOD COVERED:  0000Z (UTC) 03/20/97 - 0000Z (UTC) 03/21/97

Daily Status Report as of 080/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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

   1.2 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 QDOTULIR17.  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.

   1.3 Completed NIC1/2/3 7135 (NICMOS Intermediate  Focus / Alignment)

       The NICMOS was used to make observations of NGC-3603.  The purpose =
of this activity is to perform a series of iterative adjustments of the =
NICMOS pupil alignment mechanism to establish the initial optical =
alignment in focus and tilt for all three cameras.  A dark calibration =
image was also taken.  The observations were completed as schedule, and =
no anomalies were reported. 

   1.4 Completed Two Sets of FGS 7026 (Fold Flat 3 (FF3) Position =
Optimization for FGS-1R)

       The FGSs were used to make FF3 C FGS-1R S-curves which will be =
optimized to achieve a modulation within 10 per-cent of the maximum =
accepted value at a particular field location and to produce an acceptable=
 set of S-curves over the entire FGS field of view.  The folding flat was =
adjusted using PSTOLs from the ground.  The observations were completed =
as planned and no problems were reported. 

   1.5 Completed WF/PC-2 6903 (WF/PC-2 Cycle 6 Calibration: Decontaminatio=
n)

       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.

   1.6 Completed NIC 1/2/3 7039 (NICMOS to FGS Astrometric Calibration - =
Aperture Locations)

       The NICMOS 1/2/3 cameras were used to make astrometric =
observations of the cluster NGC-188 in order to determine the various  =
aperture locations.  The position of NICMOS apertures in the HST focal =
plane was measured to an accuracy of +/- 2 arcsec in the V2-V3 plane.  =
The test were repeated three times to monitor the temporal evolution of =
the aperture locations as function of focus position.  The observations =
were executed as scheduled, and no anomalies were noted. 

   1.7 Completed Two 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. 

   1.8 Completed STIS/CCD 7099 (CCD Flat-Field Stability and Cosmetic =
Defect Fraction)

       These observations were used to verify cosmetic defect fraction on =
the CCD using flat-field images, and to  investigate flat-field stability =
over short (minutes) and
long (days)time intervals.  The observations were executed as scheduled, =
and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:


2.1 Guide Star Acquisitions: 

                            Scheduled Acquisitions : 10
                                        Successful : 10

                          Scheduled Reacquisitions : 4
                                        Successful : 4

   2.2 FHST Updates: 

                              Scheduled : 15
                             Successful : 15

   2.3 Operations Notes: 

       No significant opertional problems were reported.

       One hundred NICMOS images were dumped from buffer memory by =
real-time command at 079/1257Z.  Later, at 079/2241Z, the NICMOS filter =
wheel movement was enabled.

3.0 SIGNIFICANT FORTHCOMING EVENTS: 

       Continuation of SMOV activities.
/DMH