HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2111

PERIOD COVERED:  0000Z (UTC) 04/27/98 - 0000Z (UTC) 04/28/98

Daily Status Report as of 118/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed WF/PC-2 6776 (A Comparative HST Imaging Study of Radio
Galaxies and Hosts)

       A clear understanding of the nature of the host galaxies of
radio-quiet quasars, radio-loud quasars and radio galaxies is of central
importance in any attempt to unify and relate the three main classes of
powerful active galaxies.  Existing HST studies of quasar hosts, whilst
producing many interesting new results, have yielded surprisingly little
hard information on the properties of the hosts themselves.  This imaging
study og radio galaxy 3C436 using the WF/PC-2 will remedy this situation by
undertaking redder, line-free observations of our three matched AGN
samples.  The proposal completed with no reported problems.

   1.2 Completed Three 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.

   1.3 Completed Two 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.

   1.4 Completed Three Sets of NIC/2 7226 (Search for Massive Jupiters)

       The Near Infrared Camera (Camera Two) was used to make a corographic
search for massive planets around nearby, young main sequence star
HD177996.  Because of the extreme youth of these objects, any low-mass
brown dwarf and planetary companions will still be in a higher luminosity
phase and thus easily detectable.  A dark calibration image was also taken.
The observations were executed as scheduled, and no anomalies were noted.

   1.5 Completed FGS 7493 (Calibrating the Mass-Luminosity Relation at the
End of the Main Sequence)

       The FGSs were used to make observations of star G250-29 in order to
make calibration observations of the mass-luninocity relation at the end of
the main sequence.  The study utilizes HST-FGS and infrared speckle imaging
to calibrate the mass-luminosity relation for stars less massive than 0.2
Msun, with special emphasis on objects near the stellar/brown dwarf border.
The observations were completed as scheduled, and no problems were noted.

   1.6 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.

   1.7 Completed STIS/CCD 7930 (STIS CCD Binned Bias Monitor)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
numerous bias exposures in 1 x 2 binned mode in order to permit
construction of "superbias" frames in which the effects of read noise have
been rendered negligible.  The observations were executed as scheduled, and
no anomalies were noted.

   1.8 Completed STIS/MA2 7647 (STIS NUV-MAMA Cycle 7 Flats)

       The Space Telescope Imaging Spectrograph (MA2) was used to make
near-ultraviolet (NUV) flat calibration images.  This program will obtain
NUV-MAMA flat-field observations with the D2 lamp for the construction of
on-orbit D-flats for G230M.  A dark calibration image was also taken.  The
observations were executed as scheduled, and no anomalies were noted.

   1.9 Completed Three Sets of 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.

   1.10 Completed STIS/CCD 7932 (Spectral Purity and slit throughputs for
the First Order Spectroscopic Modes)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of standard star GD71 in order to study the spectral purity
and slit throughputs for the first order spectroscopic modes.  The purpose
of this proposal is to measure and quantify this effect by observing strong
absorption lines through slits of different sizes.  A wave length
calibration image was also taken.  The observations were completed as
scheduled, and no problems were reported.

   1.11 Completed STIS/MA1 7645 (STIS FUV-MAMA Cycle 7 Flats)

       The Space Telescope Imaging Spaectrograph (MA1) was used to make
far-ultraviolet flat calibration images.   This program will obtain
FUV-MAMA flat-field observations with the Kr lamp for the construction of
on-orbit D-flats for G140M.  A dark calibration image was also taken.  The
observations were completed as planned, and no anomalies were reported.

   1.12 Completed Two Sets of WF/PC-2 7501 (Expansion Parallax Distances to
Planetary Nebulae)

       The WF/PC-2 was used to make parallax distance measurements of the
planetary nebulae IC4663 and NGC-6326.  The largest impediment to our
understanding of planetary nebulae is the lack of reliable distances.
Acquired by generalized statistical methods in all but a handful of cases,
individual PNe distances are often uncertain by factors of two or more.  As
detailed in 2.1, the acquisition for the first iteration of this proposal
failed and the take data flag remained down.  Nine observations were
affected.  Otherwise, the observations were executed as scheduled, and no
further anomalies were noted.

   1.13 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.  As
detailed in 2.1, the acquisition for the first iteration of this proposal
failed and the take data flag remained down.  Two observations were
affected.  Otherwise, the observations were completed as planned, and no
further anomalies were reported.

   1.14 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.

   1.15 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.

   1.16 Completed NIC/1/2/3 7832 (The Age of Inner Bulge Globular Clusters)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the globular cluster Terzan-4 which is located in the
Milky Way's central bulge.  Until recently very little was known about the
age the globular clusters of the galactic bulge, as a combination of
crowding, differential reddening, and distance made turnoff photometry
beyond the reach of ground based observations.  The observations were
completed as planned, and no problems were reported.

   1.17 Completed WF/PC-2 7282 (A Continuing Snapshot Survey for Compact
Stellar Groups and Clusters around Wolf-Rayet Stars)

       The WF/PC-2 was used to make observations of the Wolf-Rayet star
WR104 as part of a continuing snapshot survey of compact stellar groups and
clusters.  The newly imaged clusters allow us to accurately determine the
distances, luminosities, and ages of the WR members.  The observations were
executed as scheduled, and no anomalies were noted.

   1.18 Completed NIC/2 7960 (NICMOS Persistence Test)

       The Near Infrared Camera (Camera Two) was used to conduct a
persistence test.  The goal of these tests is to determine whether multiple
reads hasten the reduction of image persistence from infrared photons and
cosmic rays.  The observations were completed as planned, and no anomalies
were reported.

   1.19 Completed NIC/2/3 7453 (The SBF Hubble Diagram)

       The Near Infrared Camera (Camera Two and Three) was used to make
deep NICMOS observations of galactic cluster Abell-3581 to determine its
distance using the surface brightness fluctuation {SBF} method.  HST is
essential for its high spatial resolution which makes it possible to detect
and remove globular clusters and background galaxies that contaminate the
SBF measurement.  The observations were executed as scheduled, and no
anomalies were noted.

   1.20 Completed WF/PC-2 7625 (WF/PC-2 Cycle 7 Earth Flats)

       The WF/PC-2 was used to make a series of Earth flat calibration
images.  These flat fields will allow mapping of the OTA illumination
pattern and will be used in conjunction with previous internal and external
flats to generate new pipeline superflats.  The observations were completed
as planned, and no anomalies were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 11
                                        Successful : 10

       The acquisition scheduled for 117/1138Z failed to the RGA mode when
the scan step limit was exceeded.  HSTAR 6450 was written.  The two full
maneuver updates prior to the acquisition had both failed, causing
excessive attitude error (HSTAR 6449).  The proposals described in 1.12 and
1.13 were affected.  Subsequently, an ARU/PRT was uplinked at 117/123100Z,
and the following acquisitions were successful.

                          Scheduled Reacquisitions : 5
                                        Successful : 5

   2.2 FHST Updates:

                              Scheduled : 14
                             Successful : 14

   2.3 Operations Notes:

       Per ROP SR-1, the SSR correctable EDAC counts were cleared three times.

       At 118/004641Z STIS experienced an MCE reset on MAMA1 during a SAA
crossing and while the high voltage was off.  HSTAR 6451 was written.  The
STIS error counter was cleared at 118/010256Z per ROP NS-12.  Recovery was
completed at 118/015003Z with the high voltage on command in the SMS.
Science was not impacted.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH