HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2113

PERIOD COVERED:  0000Z (UTC) 04/29/98 - 0000Z (UTC) 04/30/98

Daily Status Report as of 120/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed STIS/CCD 7803 (Daily Darks to Update Acquisition Bad Pixel
Table Part III)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
daily dark calibration updates.  These daily darks are intended to identify
hot pixels for update to the acquisition on-board FSW hot pixel table.
Daily hot pixel lists can also be used for science data analysis.  The
observations were completed as planned, and no anomalies were reported.

   1.2 Completed Three Sets of WF/PC-2 7712 (WF/PC-2 Cycle 7 Supplemental
Darks pt2/3)

       The WF/PC-2 was used to make a series of Cycle 7 supplemental
calibration darks.  This dark calibration program obtains three dark frames
every day to provide data for monitoring and characterizing the evolution
of hot pixels.  The observations were executed as scheduled, and no
anomalies were noted.

   1.3 Completed STIS/MA1 7401 (A Critical Test of Crystallization in White
Dwarf Stars)

       The Space Telescope Imaging Spectrograph (MA1) was used to make
observations of the white dwarf star BPM37093.  Theoretical calculations
indicate that the massive pulsating DA white dwarf, BPM37093, has a
crystallized ion interior.  A wavelength calibration image was also taken.
The observations were executed as scheduled, and no anomalies were noted.

   1.4 Completed Nine Sets of NIC/2/3 7907 (NICMOS Pure Parallel Winter 97-98)

       The Near Infrared Camera (Cameras Two and Three) was used to make
pure parallel spectrographic observations of sky regions when another
instrument is prime.  The observations were completed as planned, and no
anomalies were reported.

   1.5 Completed Three Sets of WF/PC-2 7909 (POMS Test Proposal: WF II
Parallel Archive Proposal)

       The WF/PC-2 was used to make parallel observations as part of the
POMS test proposal.  This test proposal is designed to simulate scientific
plans.  The observations were completed as planned, and no problems were
reported.

   1.6 Completed STIS/CCD 7926 (CCD Dark and Bias Monitor -- Continued)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
several dark and bias calibration observations.  This is to measure CCD
dark current and bias rates for the two supported amplifier settings {gain
= 1 and gain = 4} in order to gather data for making superdarks and
superbiases.  These observations will also track the growth of hot pixels
on the CCD in general and within the various target acquisition apertures
specifically.  The observations were executed as scheduled, and no
anomalies were noted.

   1.7 Completed WF/PC-2 6698 (High Resolution Imaging of Bubble and
Superbubbles in H II Regions)

       The WF/PC-2 was used to make high resolution observations of the H
II region N63.  Massive stars dynamically interact with their ambient
interstellar medium via fast stellar winds during their lifetime and via
supernova blasts at their demise.  The dynamical interaction causes the
physical structure of an H II region to evolve along with its ionizing
massive stars.  The observations were executed as scheduled, and no
anomalies were noted.

   1.8 Completed WF/PC-2/STIS/CCD/NIC/1/2/3 7307 (The Formation and
Evolution of Rich Star Clusters in the LMC)

       The WF/PC-2, the Space Telescope Imaging Spectrograph (CCD), and the
Near Infrared Camera (Cameras One, Two, and Three) were used to make
observations of the rich star clusters which are located within the Large
Magellanic Cloud in order to study their formation and evolution.  These
observations will help us understand the origin and evolution of rich star
clusters in our own galaxy.  The observations were completed as scheduled,
and no anomalies were reported.

   1.9 Completed Three Sets of WF/PC-2 7336 (Cosmological Parameters Omega
and Lambda From High-Redshift Type Ia Supernovae)

       The WF/PC-2 was used to make observations of the high redshifted
Type Ia supernovae 11H0.5Z1, 11H0.5Z2, and 14H0.5Z1.  HST can make a direct
measurement of the cosmological parameters, Omega, Lambda, and curvature,
using Type Ia supernovae as calibrated "standard candles."  The
observations were executed as scheduled, and no anomalies were noted.

   1.10 Completed Five Sets of STIS/CCD 7908 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
calibration observations as part of the POMS Test Proposal.  This was a
STIS non-scripted parallel proposal.  The observations were completed as
planned, and no problems were reported.

   1.11 Completed WF/PC-2 7590 (Cosmological Parameters Omega and Lambda
From High-Redshift Type IA Supernovae)

       The WF/PC-2 was used to make observations of type 1A supernova
SN9784 in order to study its redshift.  The HST was used to make direct
measurements of the cosmological parameters Omega, Lambda, and curvature
using Type 1A supernovae as a calibrated "standard candle".  The
observations were executed as scheduled, and no anomalies were noted.

   1.12 Completed FGS 6878 (Parallax of NGC-6853)

       The Fine Guidance Sensors were used to make astrometric observations
of stars located in NGC-6853.  NGC 6853 is one of the closest planetary
nebulae.  Its trigonometric parallax is presently only poorly known.  HST
observations have the potential to reduce the parallax uncertainty to about
0.0005 arcsec.  The observations were completed as scheduled, and no
anomalies were reported.

   1.13 Completed STIS/CCD 7911 (STIS Galactic Plane Pure Parallel Program)

       The Space Telescope Imaging Spectrograph (CCD) was used to make low
galactic latitude survey observations in parallel with the prime science
observations.  Short exposures with the 50CCD imaging mode will provide the
wavelength zero-point calibration.  These data will be placed immediately
into the Hubble Data Archive.  The observations were executed as scheduled,
and no anomalies were noted.

   1.14 Completed NIC/1/2/3 7855 (The Evolution of Powerful Radio Galaxies)

       The Near Infrared Camera (Cameras One, Two, and Three) was used to
make observations of the powerful radio galaxy 4C76.03.  Our proposed
NICMOS observations combined with our multi-wavelength observing program
will finally provide us with the data we need to build a picture of how
powerful radio galaxies evolve.  The observations were completed as
planned, and no porblems were reported.

   1.15 Completed NIC/1 7867 (NICMOS Imaging of the Dusty CfA Seyfert Nuclei)

       The Near Infrared Camera (Camera One) was used to make observations
of the Seyfert Galaxy NGC-3786.  These data will allow us to determine if
the Seyfert Type 1/2 dichotomy is best explained by the unified model, the
evolutionary picture, or a combination of both of these scenarios.  Near
the end of this two-hour proposal, the loss of lock mentioned in 2.1
occurred, and the take data flag went down temporarily.  Otherwise, the
observations were executed as scheduled, and no further anomalies were
reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 12
                                        Successful : 12

       Following a successful re-acquisition at 119/232505Z (two attempts)
and a subsequent type 3 slew, a loss of lock occurred at 119/234356Z.
HSTAR 6454 was written.  The proposal described in 1.15 was affected.


                          Scheduled Reacquisitions : 2
                                        Successful : 2

   2.2 FHST Updates:

                              Scheduled : 26
                             Successful : 26

   2.3 Operations Notes:

       Using ROP SR-1, the SSR correctable EDAC errors were cleared three
times.

       Operations personnel returned from the SAMS backup facility at
approximately 119/2100Z.  No problems occurred either in the facility or in
the transition.

       NICMOS memory monitors were installed at 120/0012Z in preparation
for an upcoming C-hole Position proposal.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH