HUBBLE SPACE TELESCOPE

                        DAILY REPORT #2485

PERIOD COVERED:  0000Z (UTC) 10/22/99 - 0000Z (UTC) 10/25/99

Daily Status Report as of 298/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Four 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.

    1.2 Completed Three 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.

    1.3 Completed Six 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.

    1.4 Completed Seven 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.  The observations were executed as scheduled, and no anomalies 
were reported.

    1.5 Completed STIS/CCD 8116 (Spectroscopy of the Rapidly-Evolving, 
Chemically Inhomogeneous Planetary Nebula BD+30)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
spectrographic observations of the rapidly-evolving, chemically 
inhomogeneous planetary nebula BD+30 (a.k.a., PK64+5D1).  One of the few 
PNe with X-ray emission from the shocked stellar wind, it is an approved 
AXAF target.  The observations were executed as scheduled, and no anomalies 
were noted.

    1.6 Completed Three Sets of WF/PC-2 8390 (Expansion Parallax Distances 
to Planetary Nebulae)

        The WF/PC-2 was used to make observations of the planetary nebulae 
NGC-6578, NGC-6891 and NGC-6884 in order to study their parallax 
distance.  The largest impediment to our understanding of planetary nebulae 
is the lack of reliable distances.  The observations were executed as 
scheduled, and no anomalies were noted.

    1.7 Completed Ten 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 low 
galactic latitude observations as part of a non-scripted POMS Test 
Proposal. The observations were completed as scheduled, and no problems 
were reported.

    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 8330 (High Resolution Imagery of Selected 
Symbiotic Stars)

        The WF/PC-2 was used to make high resolution observations of the 
variable symbiotic star HM-Sge.  A fuller understanding of the symbiotic 
star phenomenon is important to several branches of astrophysics including 
mass loss, accretion onto compact objects, and photoionization and 
radiative transfer in gaseous nebulae.  The observations were completed as 
scheduled, and no problems were reported.

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

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

    1.11 Completed STIS/CCD 8422 (Imaging Sensitivity and PSF Library C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
Point Spread Function (PSF) observations using standard star 
WD0310-388.  This program has several goals: {1} to improve the calibration 
of the on-axis imaging sensitivity of STIS; {2} to obtain high S/N 
observations stars {both saturated and unsaturated} for a PSF library, and 
{3} to obtain narrow-band observations of a star field to improve on the 
STIS PSF model.  The observations were completed as scheduled, and no 
anomalies were reported.

    1.12 Completed WF/PC-2 8332 (A Snapshot Survey of Symbiotic Stars)

        The WF/PC-2 was used to make observations of the star HD149427 as 
part of a snapshot survey of symbiotic stars.  A fuller understanding of 
the symbiotic star phenomenon is important to several branches of present 
day astrophysics including mass loss, accretion onto compact objects, and 
photoionization and radiative transfer in gaseous nebulae.  The 
observations were completed as planned, and no anomalies were reported.

    1.13 Completed Four Sets of 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 galaxies KK-27, KK063, KK017 and E407-G18.  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

    1.14 Completed STIS/CCD 8111 (CS 22892--052: A Rosetta Star for the Age 
and Early History of the Galaxy)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the "Rosetta" star CS22890.  These observations should 
provide significant new information about the early history of the galaxy, 
specifically the nature of the earliest generations of stars and the types 
of nucleosynthetic processes that occurred in those stars.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.15 Completed Two 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.  The observations were 
completed as planned, and no anomalies were reported.

    1.16 Completed STIS/MA1/MA2 8144 (UV Spectroscopic Snapshots of FUSE 
AGN Targets)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to make far ultraviolet spectrographic snapshot observations of the 
FUSE AGN target HE2347-434.  This object is currently scheduled to be 
observed by the Far Ultraviolet Spectroscopic Explorer {FUSE}.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.17 Completed STIS/CCD/MA1 8287 (A Search For Transparent Lines of 
Sight With Intergalactic He-II Absorption Towards 26 Bright z > 2.9 Quasars)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make He-II absorption line observations of quasar HE2257-545.  The aim is 
to identify more suitable bright objects for detailed studies of 
intergalactic He-II absorption at a redshift of Z <2.9 and >3.2 .  A 
wavelength calibration observation was also taken.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.18 Completed WF/PC-2/STIS/CCD 7717 (Spectroscopy of Jupiter, Saturn, 
Titan and the Moon in the UV)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were 
used to observe the Moon, Jupiter, Saturn and Titan in the UV. The goal is 
to determine weak absorption features, due to atmospheric gases, as well as 
Raman scattering features in the spectra of Jupiter, Saturn and Titan. The 
Moon will be used as a solar analog to reduce planetary fluxes to 
reflectivities.  The proposal completed as scheduled, with no reported 
problems.

    1.19 Completed Two Sets of WF/PC-2 8230 (Snapshot Survey of Dynamically 
Close Galaxy Pairs from z=0.1 to z=0.5)

        The WF/PC-2 was used to make snapshot survey observations of 
galactic cluster Gal-Clus-2723.  This is to obtain snapshot images of a 
large, well-defined, and dynamically selected sample of close galaxy pairs 
at moderate redshift.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.20 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.

    1.21 Completed FOC/96 8547 (FOC Closeout)

        The Faint Object Camera (F/96) was used to make ultraviolet 
observations of the standard star BPM16274 as part of the instrument's 
final close-out procedures.  This is to monitor the throughput of the 
COSTAR+FOC combination.  The data will be used to provide a final check of 
the sensitivity of the FOC before SM3A.  An internal flat was also 
taken.  The observations were executed as scheduled, and no anomalies were 
noted.

    1.22 Completed Three Sets of STIS/CCD 8410 (STIS CCD Hot Pixel 
Annealing C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to assess 
the effectiveness of the CCD hot pixel annealing process by measuring the 
dark current behavior before and after annealing and by searching for any 
window contamination effects.  In addition CTE performance is examined by 
looking for traps in a low signal level flat.  The observations were 
completed as planned, and no anomalies were reported.

    1.23 Completed Two Sets of WF/PC-2 7465 (White Dwarf Distance and 
Precision Age for Globular Clusters)

        The WF/PC-2 was used to make observations of white dwarf star 
WD1105-049 which is located in globular cluster 47-Tuc.  The observed 
cooling sequences for the clusters is to be fit to the corresponding FCSs 
(Fiducial Cooling Sequences) to determine accurate cluster distance moduli 
and absolute ages.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.24 Completed WF/PC-2 7495 (Survey of Gravitational Lenses as 
Cosmological Tools)

        The WF/PC-2 was used to make survey observations of object 
HE2149-274 by obtaining deep, high-resolution images in the optical and 
near IR in order to see if it is gravitationally lensed and could be used 
as a cosmological tool.  The observations were executed as scheduled, and 
no anomalies were noted.

    1.25 Completed WF/PC-2 8175 (A Survey of Gravitational Lenses as 
Cosmological Tools III)

        The WF/PC-2 was used to make observations of the gravitational lens 
system HE2149-274.  Gravitational lenses are powerful tools for studying 
cosmology, galactic structure, and galaxy evolution.  The observations were 
completed as planned, and no anomalies were reported.

    1.26 Completed WF/PC-2 8222 (An Emission Line Survey of the Crab Nebula)

        The WF/PC-2 was used to conduct an emission line survey of the Crab 
Nebula (a.k.a., M-1) in the light of emission from O I, S II, and O III, 
and in a single continuum band.  In addition to our specific scientific 
objectives, this survey will provide a data set that is essential to all 
future studies of the structure, dynamics, and evolution of the Crab.  The 
observations were executed as scheduled, and no anomalies were reported.

       1.27 Completed WF/PC-2 8216 (T Tauri Star Snapshot Survey II. 
Completing the CTTs Sample)

        The WF/PC-2 was used to make observations of the T-Tauri class star 
known as Reipurth-4 as part of Snapshot Survey II.  This database will be 
of fundamental importance to understanding the nature of planet-forming 
environments and their frequency in the galaxy.  The observations were 
executed as scheduled, and no anomalies were noted.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:

                             Scheduled Acquisitions: 24
                                         Successful: 24

                          Scheduled Re-acquisitions: 27
                                         Successful: 27

    2.2 FHST Updates:

                               Scheduled: 44
                              Successful: 44

    2.3 Operations Notes:

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

        A TTR was written for a dropout of unrecoverable data from 
295/135643Z until 295/135710Z.

        The NICMOS FPA temperature sensor for detector 2 was enabled at 
297/13119Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/DMH