HUBBLE SPACE TELESCOPE

       DAILY REPORT #2490

PERIOD COVERED:  0000Z (UTC) 10/29/99 - 0000Z (UTC) 11/01/99

Daily Status Report as of 305/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Two 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 Two Sets of STIS/MA2 8150 (The Metallicity and Dust 
Content of HVC Complex C)

        The Space Telescope Imaging Spectrograph (MA2) was used to make 
spectrographic observations of the metallicity and dust content of the High 
Velocity Cloud (HVC) Complex C located in Seyfert galaxy MARK290.  These 
observations will provide important zero-redshift abundance information for 
the study of gas and dust in damped Lyman-Alpha systems.  A wavelength 
calibration image was also taken.  The observations were executed as 
scheduled, and no anomalies were noted.

    1.3 Completed Five 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 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.  The observations were executed as scheduled, and no anomalies 
were reported.

    1.5 Completed WF/PC-2 8274 (A Size Survey of Cometary Nuclei)

        The WF/PC-2 was used to make observations of the comet FORBES2 as 
part of a size survey of cometary nuclei.  This is part of a program to 
determine the basic physical properties of a large fraction of the 
population of short-period comets.  The observations were completed as 
planned, and no anomalies were reported.

    1.6 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.

    1.7 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 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 WF/PC-2/STIS/CCD 7566 (Demographics of Nuclear Black Holes)
        The Space Telescope Imaging Spectrograph (CCD) and the WF/PC-2 were 
used to make observations of normal galaxy NGC-1700 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.

    1.9 Completed WF/PC-2/STIS/CCD 8324 (The Structure and Kinematics of 
Irradiated Disks and Associated High Velocity Features in Orion)

        Both the WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) 
were to be used to make observations of high velocity feature M-42- HST10 
located within the Orion Nebula.  As described in HSTAR 7331 and 2.1, the 
acquisition for this proposal failed, the take data flag remained down, and 
one STIS and four WF/PC-2 observations were lost.

    1.10 Completed STIS/CCD 8202 (Bright Quasar Close Lensing Search)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of HCLQ0220-2 as part of a second generation survey to search 
for bright lensing quasars.  With the restored PSF, new images will be 
considerably more sensitive to the presence of both close separation and 
faint lens components, and because STIS reaches two magnitudes fainter the 
PC, the new snapshot images will have much greater dynamic range.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.11 Completed STIS/CCD/MA2 8197 (Detection of ^11B/^10B: Part II)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
make spectrographic observations of star HD160617 to measure the boron 
isotope ratio (i.e., 11B/10B).  A wavelength calibration image was also 
taken.  The observations were completed as planned, and no anomalies were 
reported.

    1.12 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 HE2313-290.  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.

    1.13 Completed Three Sets of WF/PC-2 8296 (Massive Blue Clusters in M31)

        The WF/PC-2 was used to make observations of the massive blue 
clusters NGC-224-G21, NGC-224-G44 and NGC-224-G94 which are 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.  As detailed in 2.1 and HSTAR 7332, during the first iteration of 
this proposal, the acquisition defaulted to fine lock back-up one FGS only, 
possibly affecting eight observations.  Otherwise, the observations were 
completed as planned, and no further problems were reported.

    1.14 Completed Three 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.  As detailed in 2.1 and HSTAR 7332, during the first iteration of 
this proposal, the acquisition defaulted to fine lock back-up one FGS only, 
possibly affecting six observations.  Otherwise, the observations were 
completed as scheduled, and no further problems were reported.

    1.15 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 HD210809 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.

    1.16 Completed Two Sets of STIS/CCD 8226 (Discerning the Origins of 
Blue Stragglers: Masses and Rotation Rates)

        The Space Telescope Imaging Spectrograph (CCD) was used to study 
the blue stragglers in globular cluster NGC-104.  Conventional wisdom holds 
that the masses of Blue Straggler Stars in globular clusters are 
significantly larger than the turnoff mass.  A wavelength calibration 
observation was also taken.  The observations were executed as scheduled, 
and no anomalies were noted.

    1.17 Completed Two Sets of 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.

    1.18 Completed 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-0723.  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.

    1.19 Completed WF/PC-2 8183 (Morphology of the Most Massive Galaxies in 
the Early Universe)

        The WF/PC-2 was used to make observations of the massive radio 
galaxy USS2202+12 in order to study its morphology.  High redshift radio 
galaxies are fundamentally important probes of galaxy and cluster 
formation.  The observations were completed as scheduled, and no anomalies 
were reported.

    1.20 Completed WF/PC-2 8307 (Morphology of High Radio Surface 
Brightness Planetary Nebulae)

        The WF/PC-2 was used to make observations of the high radio surface 
of the planetary nebula PK037-06D1.  The morphological transformation from 
the spherically symmetric circumstellar envelopes of AGB stars to the 
complex, bipolar structures of planetary nebulae has remained one of the 
major unresolved problems in the late stages of stellar evolution.  The 
observations were completed as planned, and no problems were reported.

    1.21 Completed STIS/CCD/MA1 8246 (The Youngest Massive Star Clusters in 
the SMC as Clues to Star Formation in the Early Universe)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make observations the young massive star cluster SMC-N81 that is located in 
the Small Magellanic Cloud.  These are the youngest massive stars 
accessible to direct observations at ultraviolet and optical 
wavelengths.  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: 18
        Successful: 16
         Scheduled Re-acquisitions: 29
        Successful: 25

        As documented in HSTAR 7331, the acquisition at 302/172136Z failed 
when the search radius limit was exceeded for FGS-1.  The proposal 
described in 1.9 was affected.  As a result of the acquisition failure 
NS-12 was utilized at 302/1812Z to reset the STIS flight software error 
counter.

        The acquisition at 303/062245Z defaulted to fine lock back-up on 
FGS-2 only.  HSTAR 7332 was written.  The proposals detailed in 1.13 and 
1.14 may have been affected.

        HSTAR 7334 describes the acquisition scheduled at 304/114858Z which 
was late.  It appeared to be affected by the beginning and end of a 
tracking support.

        The acquisition at 305/050653Z failed when the search radius limit 
was exceeded.  The prior FHST updates were nominal.  A map taken after the 
failure showed 4.552 on V1, 2.225 on V2, and 19.720 on V3.  HSTAR 7335 was 
written.  Three proposals occurring during the period of the next report 
were affected: WF/PC-2 8160, STIS 7912, and WF/PC-2 8443.

    2.2 FHST Updates:
        Scheduled: 44
        Successful: 44

    2.3 Operations Notes:

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

        At 304/101104Z, the primary load bus current flagged high with a 
value of 99 amps (limit is 96 amps).  The flag appeared again at 
304/101103Z.  In each case the limit violation last for one telemetry 
update.  Both occurred near the end of orbit nigh when a vehicle and solar 
array slew were taking place.  HSTAR 7333 was written.

        A full DF-224 memory dump was performed at 304/0256Z per ROP DF-1.

        Using ROP PO-8, a fine attitude determination was done at 305/0834Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW