HUBBLE SPACE TELESCOPE

                        DAILY REPORT #2480

PERIOD COVERED:  0000Z (UTC) 10/15/99 - 0000Z (UTC) 10/18/99

Daily Status Report as of 291/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Six Sets of STIS/CCD 8408 (STIS CCD Dark Monitor C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to make a 
CCD bias calibration observation.  This is to monitor the darks for the 
STIS CCD.  As described in HSTAR 7313 and the previous report, the 
acquisition for the second iteration of this proposal defaulted to fine 
lock on one FGS only, possibly affecting several observations.  Otherwise, 
the observations were executed as scheduled, and no further anomalies were 
reported.

    1.2 Completed SIX Sets of WF/PC-2 8443 (WF/PC-2 Cycle-8 Supplemental 
Darks pt1/3)

        The WF/PC-2 was used to obtain three dark frames every day to 
provide data for monitoring and characterizing the evolution of hot 
pixels.  The observations were completed as planned, and no problems were 
reported.

    1.3 Completed Two Sets of STIS/CCD/MA2 8342 (Abundances in Halo Stars 
and Galactic Element Formation)

        The Space Telescope Imaging Spectrograph (MA1 and CCD) was used to 
make observations of the stars HD165195 and BD+173248 as part of a study of 
the abundances in halo stars and galactic element formation.  The results 
for the very oldest galactic stars will also provide an important, and 
independent, age determination for the Galaxy and hence constrain 
cosmological age estimates.  A wavelength calibration image was also 
taken.  As described in HSTAR 7313 and the previous report, the acquisition 
for the first iteration of this proposal defaulted to fine lock on one FGS 
only, possibly affecting several observations.  Otherwise, the observations 
were executed as scheduled, and no further anomalies were noted.

    1.4 Completed Four Sets of WF/PC-2 8436 (POMS Test Proposal: WFII 
Backup Parallel Archive Proposal II)

        The WF/PC-2 was used to make archive observations parallel to the 
prime science observations as part of a POMS test proposal.  This is a POMS 
test proposal designed to simulate scientific plans.  As described in HSTAR 
7313 and the previous report, the acquisition for the first two iterations 
of this proposal defaulted to fine lock on one FGS only, possibly affecting 
five observations.  Otherwise, the observations were completed as planned, 
and no further anomalies were reported.

    1.5 Completed Two Sets of STIS/MA1 8180 (The Lyman Continuum Radiation 
from Galaxies)

        The Space Telescope Imaging Spectrograph (MA1) was used to make 
observations of galaxy CFRS22.027 in order to study its Lyman continuum 
radiation.  The amount of ionizing radiation released into the 
intergalactic medium by star formation is a poorly known but crucial 
parameter.  A wavelength calibration image was also taken.  As described in 
2.1 and HSTAR 7316, the acquisition for the second iteration of this 
proposal failed, the take data flag remained down, and three observations 
were affected.  Otherwise, the observations were executed as scheduled, and 
no further anomalies were noted.

    1.6 Completed Five Sets of WF/PC-2 8457 (UV Earthflats)

        The WF/PC-2 was used to make a ultraviolet Earth flat calibration 
image.  This is to improve the quality of pipeline the ultraviolet 
flatfields.  The observations were completed as scheduled, and no problems 
were reported.

    1.7 Completed Eight Sets of WF/PC-2 8090 (POMS Test Proposal: WF-II 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used in the parallel mode to make some low galactic 
latitude archive observations.  The program will be used to take parallel 
images of random areas of the sky.  The observations were executed as 
scheduled, and no anomalies were noted.

    1.8 Completed Three Sets of STIS/CCD 8409 (STIS CCD Bias Monitor C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to make a 
CCD bias calibration observation.  This is to monitor the bias in the 1x1, 
1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at gain = 4, to build up 
high-S/N superbiases and to track the evolution of hot columns.  The 
observations were executed as scheduled, and no anomalies were reported.

    1.9 Completed WF/PC-2 8192 (A Snapshot Survey of Probable Nearby Galaxies)
        The WF/PC-2 was used to make a snapshot survey images of a probable 
nearby galaxy IC5152.  The census of galaxies in the Local Volume of space 
is very incomplete, particularly at the faint end.  The observations were 
executed as scheduled, and no anomalies were noted

    1.10 Completed WF/PC-2 8453 (Cycle 8 Polarization)

        The WF/PC-2 was used to make observations of the standard source 
star BD+64D106 in order to verify the stability of the instrument's 
polarization calibration.  The observations were completed as planned, and 
no problems were reported.

    1.11 Completed Four Sets of STIS/CCD 8549 (POMS Test Proposal: STIS 
non-scripted parallel proposal continuation III)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
high galactic latitude observations as part of a non-scripted POMS Test 
Proposal. The observations were completed as scheduled, and no problems 
were reported.

    1.12 Completed WF/PC-2 8296 (Massive Blue Clusters in M31)

        The WF/PC-2 was used to make observations of the massive blue 
cluster NGC-224-G38 that is located in the large galaxy M-31 (a.k.a., The 
Andromida Galaxy).  Photometry of the supergiant stars will allow us to 
constrain the metallicity, one of the probable parameters relevant to the 
formation of this type of massive cluster.  The observations were completed 
as planned, and no problems were reported.

    1.13 Completed Six Sets of 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.

    1.14 Completed Two Sets of STIS/CCD 8313 (Imaging the Host Galaxies of 
High Redshift Type Ia Supernovae)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of 95103 and 97190 and their host galaxies.  The propose is to 
obtain snapshot, unfiltered STIS images of distant galaxies of known 
redshift which have hosted supernovae {SNe} of Type IA found via the 
Supernova Cosmology Project.  The observations were completed as scheduled, 
and no anomalies were reported.

    1.15 Completed Two Sets of WF/PC-2 8181 (Resolving Sirius-like Binaries)

        The WF/PC-2 was used to make observations of the stars BD+08D102 
and 56-Per in order to try and resolve these Sirius-like binary star 
systems.  Subsequent determinations of the visual orbits of the resolved 
binaries with the HST will provide dynamical measurements of the 
white-dwarf masses.  The observations were completed as scheduled, and no 
anomalies were reported.

    1.16 Completed STIS/CCD/MA2 8225 (Absorption and Obscuration in 
Radio-Loud Quasars)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make observations of the radio-loud MRCO123-22.  The role of associated 
absorption systems and dust obscuration close to the central engines of AGN 
is not understood.  A wavelength calibration image was also taken.  The 
observations were completed as planned, and no anomalies were reported.

    1.17 Completed STIS/CCD/MA1 8241 (A Snapshot Survey of Interstellar 
Absorption Lines)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make high resolution Echelle spectrographic observations of the standard 
ultraviolet star HD1999 as part of a snapshot survey of interstellar 
absorption lines.  A wavelength calibration image was also taken.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.18 Completed WF/PC-2 7306 (Halo Microlens Source Systems and their 
Underlying Stellar Backgrounds)

        The WF/PC-2 was used to obtain medium-deep broadband images of the 
star STAR-0534 for microlensing events, plus one additional star, to 
determine a} which star was actually lensed, b} the amount of crowding in 
our ground-based frames, c} if the stars are normal in the CMD, and d} if 
they lie preferentially at the back of the LMC.  The proposal completed 
with no reported problems.

    1.19 Completed WF/PC-2 8134 (Is the IMF Universal at Low Stellar Masses?)

        The WF/PC-2 was used to make observations of the cluster NGC-2159 
(a.k.a., LMC cluster R-136).  Only the HST can provide the resolution and 
limiting magnitude required to reach the low-mass end of the IMF at 
extragalactic distances.  The observations were executed as scheduled, and 
no problems were reported.

    1.20 Completed STIS/CCD 8545 (POMS Test Proposal: STIS non-scripted 
parallel proposal continuation VI)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
high galactic latitude, non-scripted parallel observations as part of a 
POMS test proposal.  The observations were completed as planned, and no 
anomalies were reported.

    1.21 Completed STIS/CCD 8318 (Probing the Evolution of Massive Stars: 
Ejecta Ring Nebulae Abundances and Dynamics)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the evolved massive stars within nebula S61-NEB.  This 
study will allow us to understand at which evolutionary stage the major 
mass loss occurs in the transition from an O to a WR class star.  A 
wavelength calibration image was also taken.  The observations were 
completed as planned, and no anomalies were reported.

    1.22 Completed WF/PC-2 8059 (POMS Test Proposal: WF-2 Targeted Parallel 
Archive Proposal)

        The WF/PC-2 was used to make observations in parallel with the 
prime science observations.  The parallel opportunities available with 
WF/PC-2 in the neighborhood of bright galaxies are treated in a slightly 
different way from the normal pure parallels.  Local group galaxies offer 
the opportunity for a closer look at young stellar populations.  The 
observations were completed as planned, and no anomalies were reported.

    1.23 Completed WF/PC-2 7340 (The Distribution of Heavy Elements in 
Supernova Ejecta)

        The WF/PC-2 was used to make maximum resolution, emission line 
observations of the ejecta material surrounding super nova SN0540-69 in 
order to study the distribution of heavy elements within that 
material.  The observations were completed as planned, and no anomalies 
were reported.

    1.24 Completed STIS/CCD 7310 (The Interaction of Accretion Disks with 
Protostellar Binaries)

        The Space Telescope Imaging Spectrograph (CCD) was used to study 
the interaction of the accretion disk with the protostellar binary system 
FO-Tau.  This should determine how the accretion disk interacts with stars 
in young binary systems and will measure the rates that mass accumulates 
onto each component of the pair.  A wavelength calibration image was also 
taken.  The observations were executed as scheduled, and no anomalies were 
noted.

    1.25 Completed STIS/CCD 8228 (The Black Hole Versus Bulge Mass 
Relationship in Spiral Galaxies)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the galaxy NGC-1255 in order to study the black hole versus 
bulge mass relationship in spiral galaxies.  A wavelength calibration image 
was also taken.  The observations were executed as scheduled, and no 
anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:

                             Scheduled Acquisitions: 19
                                         Successful: 18

        The acquisition at 290/232345Z failed due to the stop flag on 
FGS-3.  The prior full maneuver FHST updates had been good and the 
following map had good vehicle axis errors.  HSTAR 7316 was written.  The 
proposal detailed in 1.5 was affected.

                          Scheduled Re-acquisitions: 20
                                         Successful: 20

    2.2 FHST Updates:

                               Scheduled: 43
                              Successful: 43

    2.3 Operations Notes:

        The SSR EDAC error counter was cleared seven times per ROP SR-1.

        Per HSTAR 7315, at 289/000443Z the Gyro-2 error saturation counter 
incremented to "1" at the end of a type 2 slew.  This corresponded to the 
switch from high mode to low mode.  The parameter was back in bounds at 
289/000454Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/DMH