HUBBLE SPACE TELESCOPE


                       DAILY REPORT #1882

PERIOD COVERED:  0000Z (UTC) 05/20/97 - 0000Z (UTC) 05/21/97

Daily Status Report as of 141/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Two Sets of NIC/1 7152 (NICMOS Absolute Photometry Test)

       The Near Infrared Camera (Camera One) was used to conduct an
absolute photometric calibration test.  A dark calibration image was also
taken.  The observations were completed as scheduled, and no anomalies were
reported.

   1.2 Completed STIS/CCD 7076 (STIS Corrector Alignment, Fine)

       The Space Telescope Infrared Spectrograph (CCD) was used to make
observations of BPM16274 as part of a fine correction alignment and
calibration procedure.  This is to refine the STIS corrector system
alignment so that the image quality at the spectrographs slit plane is
optimized.  The observations were executed as scheduled, and no anomalies
were noted.

   1.3 Completed STIS/MA1/MA2 7084 (Verification of Optical Format of STIS
MAMA Modes)

       The Space Telescope Infrared Spectrograph (MA1 and MA2) was used to
perform verification calibration observations of the optical format for the
MAMA modes and extreme MSM positions using the Cr/Pt/Ne lamp.  The
observations were executed as scheduled, and no anomalies were noted.

   1.4 Completed WF/PC-2 6362 (Supernova Host Galaxy)

       The WF/PC-2 was used to make observations of the supernova host
galaxy GAL-160828.  The observations were executed as scheduled, and no
anomalies were noted.

   1.5 Completed NIC/1/2/3 7043 (NICMOS Focus Monitor)

       The Near Infrared Cameras (Cameras One, Two and Three) were used to
make observations of NGC-3603 in order to make focus calibration and
monitoring measurements.  This proposal is built to run NIC/1/2 focus
sweeps on a weekly basis, and NIC /3 focus sweeps twice a week during SMOV.
The observations were executed as scheduled, and no anomalies were noted.

   1.6 Completed STIS/MA2 7093 (Dark Measurement for MAMA Band 1, and Band 2)

       The Space Telescope Infrared Spectrograph (MA2) was used to make
dark calibration observations of the MAMA Band 1 and Band 2.  These
observations are to be used to establish that the detectors are performing
nominally, that no internal movement of the MCP has taken place, and to
establish the dark level in orbit for a given operating temperature.  The
observations were completed as planned, and no anomalies were reported.

   1.7 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.

   1.8 Completed Two Sets of WF/PC-2 6909 (WF/PC-2 Cycle 6 Calibration:
Earth Flats)

       The WF/PC-2 was used to make observations of the bright Earth to
obtain streak flats which are used to construct high quality flat fields
for the WF/PC-2 filter set.  The observations were executed as scheduled,
and no anomalies were noted.

   1.9 Completed NIC/2 7154 (NICMOS Coronographic Hole Monitor)

       The Near Infrared Camera (NIC Two) was used to make observations of
object NGC-3603 in order to monitor the effects of coronagrapghic hole.
The purpose of this proposal is to take lamp flats with camera Two (and
cameras One and Three occasionally) to monitor the location of the
coronographic spot.  The observations were completed as scheduled, and no
anomalies were reported.

   1.10 Completed FOC/96 6834 (Lenses, Mirrors, and HST: IRAS FSC10214+4724
Under a Compound Microscope)

       The Faint Object Camera (f/96) was used to make observations of IRAS
FSC10214+4724.  Our existing WF/PC-2 images using filter F814W provides
compelling evidence that this object which is at redshift of 2.3 and is
gravitationally lensed.  The observations were completed as planned, and no
anomalies were reported.

   1.11 Completed Two sets of WF/PC-2 6610 (WF/PC-2 Lyman-Alpha Imaging of
Galaxy cluster at Z=2.4)

       The WF/PC-2 was used to make observations of an apparent blank field
of view hoping to make Lyman-Alpha observations of faint galaxies located
at a distance of Z=2.4.  Earlier exposures revealed many compact
Lyman-Alpha emitters at this distance.  These observations were executed in
parallel with the prime science observations. The observations were
completed as planned, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 3
                                        Successful : 3

                          Scheduled Reacquisitions : 14
                                        Successful : 14

   2.2 FHST Updates:

                              Scheduled : 6
                             Successful : 6

2.3 Operations Notes:

       The MAMA2 high voltage was successfully turned on at 141/0255Z, but
some concerns, detailed in HSTAR 6074, were noted.

       Data from other turn-ons indicate a possible correlation between the
MAMA2 tube temperature and the additional noise event counts resulting from
the glass phosphorescence.  During the initial high voltage ramp, the
temperature was around 21-22 degC, resulting in noise event counts of
around 2000 per second.  As the tube temperature continued to increase to
about 31 degC, the noise event counts increased significantly.  The high
voltage ramped down nominally with the low voltages now being managed via
the SMS so they are always on external to the SAAs.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science and SMOV operations.

/DMH