HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2116

PERIOD COVERED:  0000Z (UTC) 05/04/98 - 0000Z (UTC) 05/05/98

Daily Status Report as of 125/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 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.

   1.2 Completed Four Sets of 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.

   1.3 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.

   1.4 Completed Five 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.

   1.5 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.

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

       The FGSs were used to make observations of star GL234 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.

   1.7 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.

   1.8 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.

   1.9 Completed NIC/1/2 7849 (Metallicity and the Cepheid Distance Scale)

       The Near Infrared Camera (Cameras One and Two) was used to make
observations of Cepheid variable stars in the NGC-3621 galaxy. The local
distance scale to galaxies is largely based on the Cepheid
period-luminosity relation.  Motivated by the goal of measuring an accurate
value of the Hubble constant, HST has been used successfully to discover
scores of Cepheid variables in each of about 20 galaxies.  The observations
were executed as scheduled, and no anomalies were noted.

   1.10 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal - Nearby
Galaxies - Imaging and Spectroscopy)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
parallel observations of nearby galaxies.  This survey will be useful to
study the star formation histories, chemical evolution, and distances to
these galaxies.  These data will be placed immediately into the Hubble Data
Archive.  The observations were completed as scheduled, and no problems
were reported.

   1.11 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.

   1.12 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.

   1.13 Completed NIC/2 7331 (Near-IR Properties of the Bulges of Spiral
Galaxies)

       The Near Infrared Camera (Camera Two) was used to make infrared
observations of the bulge in spiral galaxy NGC-3368.  Near-IR data at HST
resolution are essential for correcting for the effect of dust and will
enable us to derive robust nuclear properties for the sample.  The
observations were executed as scheduled, and no anomalies were noted.

   1.14 Completed S/C 7954 (FGS-1R Optimization)

       Desorption and gravity release effects have modified the morphology
and modulation of the FGS1R Transfer Function.  This test will accomplish a
re-optimization of the performance of FGS-1R by adjusting the FF3 mirror
until the S-curve at the center of the field of view is comparable to the
optimized S-curve obtained during SMOV.  This test requires special data
downlinks and uplinks for real-time commanding of the FF3.  The test
concluded with no reported problems.

   1.15 Completed NIC/1/2/3 7893 (The Two Types of BL Lac Objects: Extrema
of Jet Physics)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the BL Lac object 1ES0502+67.  These observations will
build on the WF/PC-2 survey of a well-defined sample of 97 BL Lac objects,
for which host galaxies were detected in 90 simulations predict ~100
provide essential constraints on galaxy properties --- luminosity, size,
morphology, and color --- including an unprecedented ensemble of host
galaxy color profiles at subarcsecond spatial resolution.  The observations
were executed as scheduled, and no anomalies were noted.

   1.16 Completed Three 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.

   1.17 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.

   1.18 Completed NIC/2 7420 (A Near-Infrared Search for Very Low Mass
Companions to Stars Within 10 Parsecs of the Sun)

       The Near Infrared Camera (Camera Two) was used to make searching
observations for very low mass companions to variable star LHS32.  This
star is known to be within 10 parsecs of the Sun.  The observations were
executed as scheduled, and no anomalies were noted.

   1.19 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.

   1.20 Completed STIS/CCD 7645 (STIS FUV-MAMA Cycle 7 Flats)

       The Space Telescope Imaging Spaectrograph (CCD) 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.

   1.21 Completed WF/PC-2 7470 (A Snapshot Survey of Galactic Globular
Clusters)

       The WF/PC-2 was used to make snap shot survey observations of the
crowded center of the galactic globular cluster NGC-6981.  The resulting
color-magnitude diagram will include all stars down to about one magnitude
below the main-sequence turnoff.  The observations were completed as
scheduled, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 9
                                        Successful : 9

                          Scheduled Reacquisitions : 7
                                        Successful : 7

   2.2 FHST Updates:

                              Scheduled : 24
                             Successful : 24

   2.3 Operations Notes:

       Operations request 13724 was performed in support of the FGS-1R
optimization proposal described in 1.14 above.  In the first of six parts,
an FGS-1R acquisition was executed successfully using the Internal Test
Source (ITS) at 124/1647Z, providing a baseline position for the ITS.  The
Articulated Mirror Assembly (AMA) motor 1 was commanded in 24 steps in the
forward position at 124/1726Z.  No anomalous behavior was observed.  As
specified in proposal 7954, an FGS-1R observation (and ITS acquisition) was
executed.  Preliminary analysis indicates that the ITS source appeared to
move by 4.4 arcsecs in X and 5.4 arcsecs in Y, which agreed with the
predicted motion.  The S-curves show change by the amount expected on the
positive side of zero decenter.  The next AMA move is scheduled later
today, following an analysis review meeting.

       The NSSC-1 status buffer was dumped at 124/2355Z in accordance with
ROP NS-3.

       Using ROP SR-01, the SSR EDAC counts were cleared.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH