HUBBLE SPACE TELESCOPE

                       DAILY REPORT #2100

PERIOD COVERED:  0000Z (UTC) 04/10/98 - 0000Z (UTC) 04/13/98

Daily Status Report as of 103/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

   1.1 Completed Eight 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 Three Sets of 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.

   1.3 Completed Three Sets of 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 7855 (The Evolution of Powerful Radio Galaxies)

       The Near Infrared Camera (Camera One) was used to make observations
of the powerful radio galaxy 3C200.  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.

   1.5 Completed NIC/1 7873 (NICMOS observations of potential JVAS/CLASS
gravitational lenses)

       The Near Infrared Camera (Camera One) was used to make observations
of the potential gravitational lens system J0742+3634.  The JVAS/CLASS
surveys have been the most successful to date at finding arcsecond-scale
gravitational lenses, almost doubling the known number {11 lenses found of
which 10 are new discoveries}.  The observations were executed as
scheduled, and no anomalies were noted.

   1.6 Completed NIC/2 7890 (The Youngest Stars: Circumstellar Structure,
Binary and Origin of Jets)

       The Near Infrared Camera (Camera Two) was used to make observations
of the young star HH83-IRS which has circumstellar structure, and jets.
The purpose is to obtain broadband 2.2 Mum images of the compact cavities
illuminated by Herbig-Haro (HH) energy sources, and to obtain narrowband
H-2 images to study how the HH jets originate at its source.  The
observations were completed as planned, and no problems were reported.

   1.7 Completed Two Sets of NIC/1/2 7416 (Infrared Imaging of the Dust
Shell Structures of the Mira Stars o Ceti and R Leo)

       The Near Infrared Camera (Cameras One and Two) was used to make
observations of the Mira Class stars HD84748 and HD97603 (a.k.a., o Ceti
and R Leo).  Due to their mass loss, the Mira-type variables are surrounded
by expanding shells composed of gas and dust.  The observations were
completed as planned, and no anomalies were noted.

   1.8 Completed WF/PC-2 7277 (Calibration of the Cepheid P-L Relation with
Observations of the Maser-Host Galaxy NGC)

       The WF/PC-2 was used to make observations of the maser-host galaxy
NGC-4258 to study its Cepheid variable stars.  These data will help refine
the calibration of the Cepheid period-luminosity relationship.  The
observations were completed as scheduled, and no problems were reported.

   1.9 Completed Eight 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.  As reported in 2.1 and HSTAR 6433, the acquisition
for the sixth iteration of this proposal defaulted to fine lock on one FGS
only.  Otherwise, the observations were completed as planned, and no
further anomalies were reported.

   1.10 Completed Seven 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 STIS/CCD/MA1/MA2 7943 (Transmission of Filtered Echelle
Slits)

       The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was used
to make calibration observations of the well-established spectrophotometric
standard star BD+75D325 in order to measure the transmission of the
filtered Echelle slits.  Measurements were made between 1200 A0 and 3000
A0. The observations were completed as planned, and no problems were
reported.

   1.12 Completed STIS/CCD/NIC/1/2/3 7566 (Demographics of Nuclear Black Holes)

       The Space Telescope Imaging Spectrograph (CCD) and the Near Infrared
Camera (Cameras One, Two and Three) were used to make observations of
normal galaxy NGC-4374 to try and detect a super massive black hole.  A
dark and wavelength calibration images were also taken.  The observations
were executed as scheduled, and no anomalies were noted.

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

       The FGSs were used to make observations of star GJ1215 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.

   1.14 Completed Five 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.  As reported in 2.1 and HSTAR 6433, the acquisition for the second
iteration of this proposal defaulted to fine lock on one FGS only.
Otherwise, the observations were completed as planned, and no further
problems were reported.

   1.15 Completed FOC/96 7686 (FOC Cycle 7 PSF Monitoring - Version 2)

       The Faint Object Camera (f/96) was used to measure the point spread
function (PSF) by making observations of standard star BPM16274.  Data will
be taken 4 times during the cycle.  The observations were executed as
planned, and no anomalies were reported.

   1.16 Completed STIS/CCD 7361 (The Nature of Nuclear Activity in Nearby
Galaxies)

       The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of the nuclear region of galaxy N3982.  The high resolution
spectra will be used to search for broad components in H-Alpha and for
velocity gradients, indicative of gas rotation or other ordered motions.  A
wavelength calibration observation was also taken.  As reported in 2.1 and
HSTAR 6433, the acquisition for this proposal defaulted to fine lock on one
FGS only.  Otherwise, the observations were executed as scheduled, and no
further anomalies were noted.

   1.17 Completed Two Sets of STIS/CCD/MA2 7771 (The Interstellar Medium of
Nearby Galaxies Using Supernovae as Probes)

       The Space Telescope Imaging Spectrograph (CCD and MA2) was used to
make observations of the interstellar medium by observing supernova
SN1998S.  These data will allow us to calculate metallicities and
depletions in a galaxy other than our own, values which can be compared
with higher-redshift abundance studies.  A wavelength calibration image was
also taken.  The observations were completed as planned, and no anomalies
were reported.

   1.18 Completed NIC/3 7830 (IR Spectra for Known-Mass M Dwarfs)

       The Near Infrared Camera (Camera Three) was used to make infrared
spectrographic observations of M-Class dwarf star GJ623AB.  Over the last
decade there has been considerable debate on two major issues in the
low-mass star literature: {1} the effective temperature scale for M dwarfs
and its relation to mass and luminosity and {2} the conversion from an
absolute magnitude in some passband to a bolometric magnitude.  The
observations were executed as scheduled, and no anomalies were noted.

   1.19 Completed NIC/2 7233 (Dust Disks Around Main Sequence Stars)

       The Near Infrared Camera (Camera Two) was used to make observations
of the dust disk around main sequence star Sigma-Her.  The observations
were made with the coronagraph to minimize the effects of glare from the
bright central star.  A dark calibration image was also taken.  The
observations were completed as scheduled, and no anomalies were reported.

   1.20 Completed NIC/1/2 7218 (Nearby Starburst Galaxies)

       The Near Infrared Camera (Cameras One and Two) was used to make
observations of the nearby starbursting galaxy M-82.  This proposal
encompasses a study of both the stars and interstellar material in
starburst nuclei which will test ideas about the triggering of starbursts
and whether starbursts propagate outwards in a nucleus.  The observations
were completed as planned, and no anomalies were reported.

   1.21 Completed NIC/1/2/3 7883 (Infrared Imaging of High Redshift {0.4 <=
z <= 1} Tully-Fisher Galaxies)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of the high redshifted Tully-
Fisher class galaxy HDFFF-IE2.  With the advent of 10 meter class
telescopes combined with the high spatial resolution of the HST, it is now
possible to study the internal kinematics and structural properties of
galaxies out to a redshift of z ~ 1.  The observations were completed as
planned, and no anomalies were reported.

   1.22 Completed NIC/3 7499 (NICMOS Extragalactic Parallel Grism Survey)

       The Near Infrared Camera (Camera Three) was used to make
observations as part of an extragalactic parallel Grism Survey.  This
proposal is a parallel program using NICMOS's unique capabilities for
slitless spectroscopy in the near IR.  The observations were completed as
planned, and no anomalies were reported.

   1.23 Completed STIS/CCD/MA1/MA2 7673 (STIS MAMA Sensitivity and Focus
Monitor)

       The Space Telescope Imaging Spectrograph (CCD/MA1/MA2) was used to
make observations of standard star GRW+70D582 in order to perform a MAMA
sensitivity and focus monitoring program.  This is to monitor sensitivity
of each MAMA grating mode to detect any change due to contamination or
other causes.  The observations were executed as scheduled, and no
anomalies were noted.

   1.24 Completed NIC/1/2/3 7902 (Photometric Monitoring, Photometric
Monitoring-II)

       The Near Infrared Camera (Cameras One, Two and Three) was used to
make observations of absolute standard, solar analog P330E-Cal as part of a
photometric monitoring program.  Observations were made at several
different wavelengths spanning the NICMOS wavelength range in each camera
NIC/1, NIC/2, and NIC/3 to monitor the photometric stability of the NICMOS
cameras as a function of wavelength.  The observations were executed as
scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

   2.1 Guide Star Acquisitions:

                            Scheduled Acquisitions : 17
                                        Successful : 17

       As documented in HSTAR 6433, the acquisition at 101/030532Z
defaulted to fine lock back-up on FGS-1 only.  The two re-acquisitions were
similarly affected,  The proposals described in 1.9, 1.14, and 1.16 may
have been affected.

                          Scheduled Reacquisitions : 26
                                        Successful : 26

   2.2 FHST Updates:

                              Scheduled : 31
                             Successful : 31

   2.3 Operations Notes:

       Using ROP SR-1, the EDAC error counter was cleared on seven occasions.

       The SSA transmitter was commanded at 100/2209Z and at 100/2228Z per
ROP IC-2.

       ESTR-3 was re-conditioned at 101/0857Z via ROP RD-7.

       The NSSC-1 status buffer dump was performed at 101/2350Z using ROP NS-3.

       As directed by ROP DF-1, a full DF-224 memory dump was commanded at
102/0150Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

       Continuation of normal science observations and calibrations.

/DMH