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Subject: Daily Report #2092 04/01/98


                      HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2092

PERIOD COVERED:  0000Z (UTC) 03/31/98 - 0000Z (UTC) 04/01/98

Daily Status Report as of 091/0000Z

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/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.

   1.4 Completed NIC/1/2/3 7827 (The Structure of Circumbinary Material in
Multiple T-Tauri Systems)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the T-Tauri class system RW-Aur  to study the
structure of its circumbinary material.  Recent studies of T-Tauri
populations in nearby star forming clouds have shown that the majority of
stars exist in multiple {binary or higher} systems.  The observations were
completed as planned, and no problems were reported.

   1.5 Completed STIS/MA2 7604 (Cycle 7 MAMA Dark Measurements)

       The Space Telescope Imaging Spectrograph (MA2) was used to make MAMA
dark measurements.  These darks will be used in later image reductions and
also trended over the instrument's life time as an indicator of the
detector's degradation or damage.  The observations were completed as
scheduled, and no problems were reported.

   1.6 Completed WF/PC-2 7620 (WF/PC-2 Cycle 7 Standard Darks)

       The WF/PC-2 was used to make a series of Cycle 7 standard dark
calibration images.  This dark calibration program obtains dark frames
every week in order to provide data for the ongoing calibration of the CCD
dark current rate, and to monitor and characterize the evolution of hot
pixels.  The observations were executed as scheduled, and no anomalies were
noted.

   1.7 Completed Three Sets of NIC/1/2/3 7899 (An IR Search For faint
Companions to Pleiades Very Low-Mass Stars and Brown Dwarfs)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of CFHT-PL-18, MH06 and HH18.  This is part of a infrared
campaign to search for faint companions to Pleiades very low-mass stars and
brown dwarfs.  The Pleiades has been the best site for brown dwarf {BD}
searches, with half of the presently "confirmed" BDs being Pleiades
members.  The observations were executed as scheduled, and no anomalies
were noted.

   1.8 Completed Four 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.

   1.9 Completed NIC/1/2/3 7448 (Star Formation in a Protogalaxy Candidate
at z=2.72)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the star formation region within the protogalaxy
candidate MS1512+36 which is located at a redshift of Z = 2.72 .  Recently
a new population of galaxies at high redshift has been identified by
ultraviolet absorption lines which most likely arise from very young
stellar populations.  The observations were completed as planned, and no
anomalies were reported.

   1.10 Completed STIS/CCD 7674 (IR Standards)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of standard source P330E to establish a set of absolute flux
standards on the WD scale that extend the existing wavelength coverage to
10300A with the STIS G750L grating setting.  The proposal completed with no
reported problems.

   1.11 Completed WF/PC-2 7619 (WF/PC-2 Cycle 7 Decontamination)

       The WF/PC-2 was used to conduct a Cycle 7 decontamination procedure.
Ultraviolet-blocking contaminants were removed, and hot pixels cured, by
warming the CCDs to +20C for 6 hours.  A variety of internal images were
taken before and after the decontamination in order to verify its success
and to monitor the instrument health.  The procedures were conducted as
scheduled, and no problems were reported.

   1.12 Completed Two 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.

   1.13 Completed Two Sets of NIC/2 7330 (The Fueling of Active Nucleii: A
NICMOS Snapshot Survey)

       The Near Infrared Camera (Camera Two) was used to probe the dark
matter distribution of NGC-1961 and NGC-1672 far from their centers by
observing intervening absorption from the MgII doublet (lambda 2800) in the
spectrum of one background QSO located in a geometrically optimal position.
HST observations are required because this feature is in a wavelength range
not accessible from the ground, and the QSO magnitudes and expected
strength of absorption make IUE observations unfeasible.  The proposal
completed as expected with no anomalies.

   1.14 Completed STIS/CCD/MA1/MA2 7917 (Effect of MAMA Charge Offsetting
on Sensitivity and Dispersion Accuracy)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was
operated in order to conserve charge on the STIS MAMA microchannel plates
and maintain even detector quantum efficiency.  The STIS MAMA spectroscopic
modes are differentially offset each month along and across the detector.
This 'dithering' of the spectra is a fundamental part of the operation of
the MAMAs needed to preserve its lifetime.  Thus it is important that we
characterize the effect of the offseting on the science data.  No problems
were encountered.

   1.15 Completed Three Sets of WF/PC-2 7623 (WF/PC-2 Cycle 7 Internal Flats)

       The WF/PC-2 was used to make a set of internal Cycle 7 calibration
flats which are designed to monitor the pixel to pixel flat field response
and the visflat lamp degradation, as well as detect any possible changes
due to contamination.  The calibration observations were completed as
planned, and no problems were reported.

   1.16 Completed WF/PC-2/STIS/CCD/NIC/1/2 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 and Two) were used to make observations
of the rich star clusters H14-Cen and NGC-2209 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.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 17
                                        Successful : 16

       The acquisition at 091/0609Z failed during a ZOE.  Analysis of the
event has not been completed, and no HSTAR has been written as of the time
of this report.  The effects on science will be detailed in tomorrow's
report.

                          Scheduled Reacquisitions : 3
                                        Successful : 3

   2.2 FHST Updates:

                              Scheduled : 22
                             Successful : 22

   2.3 Operations Notes:

       Using ROP SR-1, the SSR EDAC error counter was cleared three times.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH