HUBBLE SPACE TELESCOPE

   DAILY REPORT #2573

PERIOD COVERED:  0000Z (UTC) 03/03/00 - 0000Z (UTC) 03/06/00

Daily Status Report as of 066/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Three Sets of STIS/CCD 8439 (Bias Monitor-Part 2 C8)

        The Space Telescope Imaging Spectrograph (CCD) was used 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 track the evolution of hot 
columns.  The proposal completed with no reported problems.

    1.2 Completed Four Sets of WF/PC-2 8460 (Cycle 8 Supplemental Darks pt2/3)

        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 completed with no reported problems.

    1.3 Completed Seven Sets of STIS/CCD 8202 (Bright Quasar Close Lensing 
Search)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of HCLQ1131-2, HCLQ0552-5, HCLQ0724+4, HCLQ2120-5, 
HCLQ0900+4,HCLQ1156+3, and HCLQ1413-2 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.

    1.4  Completed Six Sets of STIS/CCD/MA1 8437 (Dark Monitor-Part 2 C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the darks.  The proposal completed nominally.

    1.5 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 clusters Gal-Clus-1 and Gal-Clus-0.  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.

    1.6 Completed Twelve Sets of STIS/CCD 8549 (POMS Test Proposal: 
Non-Scripted Parallel Proposal Continuation I)

        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.

    1.7 Completed STIS/CCD/MA1/MA2 8608 (Simultaneous HST, Chandra, and 
FUSE Spectroscopy of NGC 4151)

        The Space Telescope Imaging Spectrograph (CCD, MA1, and MA2) was 
used to observe NGC 4151 and investigate the absorption by warm, ionized 
gas at UV and X-ray wavelengths, which  is proving to be a common feature 
in Seyfert 1 galaxies, showing its presence in well over half the galaxies 
observed.  The observations completed and no anomalies were noted.

    1.8 Completed Eleven 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.

    1.9 Completed Two Sets of WF/PC-2 8445 (WF/PC-2 Cycle 8 Earth Flats)

        The WF/PC-2 was used to make Cycle 8 Earth flat calibration 
observations.  This is to obtain sequences of earth streak flats to 
construct high quality flat fields for the WF/PC-2 filter set.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.10 Completed WF/PC-2/STIS/CCD/MA1/MA2 8256 (Deep Helium-Mixing and 
the Ultraviolet Spectra of Hot Horizontal Branch Stars)

        The WF/PC-2 and The Space Telescope Imaging Spectrograph (CCD, MA1, 
and MA2) were used to make observations of globular cluster NGC-6752 in 
order to study the deep helium-mixing and the ultraviolet spectra of hot 
horizontal branch stars.  There is now good evidence that the luminosities 
and gravities of hot horizontal branch stars in globular clusters are not 
correctly described by canonical models of core helium- burning stars.  A 
wavelength calibration image was also taken.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.11 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 HD152590 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.

    1.12 Completed Two Sets of 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 galaxies NGC-3521 and NGC-5364 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.

    1.13 Completed STIS/CCD 8340 (Probing the Kinematics of the Narrow-Line 
Region in Seyfert Galaxies with Slitless Spectroscopy)

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
studies of the gas kinematics of the narrow-line regions in Seyfert 
galaxies.  Previous studies indicate complex velocity fields, with evidence 
for both gravitational and non-gravitational forces.  The proposal 
completed nominally.

    1.14 Completed Two Sets of 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 
stars known as V376-CAS and SZ-111 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.

    1.15 Completed WF/PC-2 8322 (The Distance to NGC 2841: Improving the TF 
Calibration and Definitively Testing MOND)

        The WF/PC-2 was used to measure a distance to the spiral galaxy NGC 
2841 using Cepheid variables.  NGC 2841 provides a unique opportunity to 
simultaneously probe three separate phenomenon in extragalactic astronomy: 
1} It will provide the highest rotational velocity data point for the 
Cepheid based calibration of the I-band Tully-Fisher relation and thus will 
firmly determine if this relation experiences curvature or remains linear 
all the way out to high rotational velocities. 2} It has hosted two SN Ia 
events; both of which have good photometry {1957A and 1972R}- this 
significantly adds to the number of calibrators for the SN Ia distance 
scale; 3} If its distance can be shown to be significantly less than 19.5 
MPC, then MOND can be definitively ruled out because NGC 2841 will require 
a value of a_o substantially in excess of the empirically determined 
"universal" value.   The observations completed nominally.

    1.16 Completed WF/PC-2 8251 (The Second-Parameter Effect in Metal- 
Rich, Globular Clusters: A Snapshot Study of NGC 6441)

        The WF/PC-2 was used to observe the newly- discovered hot 
horizontal branch (HB) populations in the metal-rich globular clusters (GC) 
NGC 6441 providing an unique opportunity for unraveling the 
second-parameter effect.  While it has long been known that at least one 
parameter besides the metallicity, Fe/H, determines the HB morphology of 
GCs, our ignorance as to the nature of this second parameter {or 
parameters} has been a major stumbling block in understanding the formation 
history and age of the GC system.  The proposal completed nominally with no 
reported problems.

    1.17 Completed STIS/CCD/MA2 8421 (Spectroscopic Sensitivity for (MAMA 
and) CCD)

        The Space Telescope Imaging Spectrograph (CCDand MA2) was used to 
perform basic sensitivity measurement for some supported (MAMA and) CCD 
spectroscopic modes.  Sensitivity measurements are done for a few primary 
tilts of the gratings.  The proposal completed nominally, with no reported 
problems.

    1.18 Completed WF/PC-2 8242 (Imaging of Dust Structures and Star 
Formation in the Disk-Halo Interface of Spiral Galaxies)

        The WF/PC-2 was used to obtain images of five edge-on spirals to 
study star formation and dusty interstellar clouds in the disk-halo 
interface of these galaxies.  The proposal completed with no reported problems.

    1.19 Completed 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-BSS.  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.

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

        The WF/PC-2 was used to observe the parallel opportunities 
available 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.  Narrow-band images in F656N can be used both to identify 
young stars via their emission lines, and to map the gas distribution in 
star-forming regions.  The observations completed nominally.

    1.21 Completed STIS/CCD/MA1/MA2 8245 (Black Hole Accretion Outbursts in 
Soft X- Ray Transients)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to make observations of the optical and ultraviolet counterpart of a 
soft X-ray outburst region from a black hole accretion disk.  A wavelength 
and a CCD flat calibration images were also taken.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.22 Completed STIS/MA2 8275 (Ultraviolet Snapshots of 3CR Radio Source 
Counterparts at Low Z)

        The Space Telescope Imaging Spectrograph (MA2) was used to make 
ultraviolet snapshot observations of the radio galaxy 3C270.0.  Radio 
galaxies are an important class of extragalactic objects, representing one 
of the most energetic astrophysical phenomena, while extraordinarily useful 
as probes of their environments and of the early Universe.  The 
observations were completed as scheduled, and no anomalies were reported.

    1.23 Completed FGS 8334 (HD 98800: An Opportunity to Measure True 
Masses for Low-Mass PMS Stars)

        The Fine Guidance Sensors were used to make astrometric 
observations of the low mass pre-main sequence (PMS) star HD98800 in order 
to measure its true mass.  HD 98800 became interesting when IRAS found it 
to have a large infrared excess, indicating a substantial dust disk.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.24 Completed FGS 8463 (Long Term Stability of FGS1R in Transfer Scan 
Mode)

        The Fine guidance Sensors were used to make astrometric 
observations of star UPGREN69 and several other reference stars in order to 
study the long term stability of FGS-1R in the Transfer Scan Mode.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.25 Completed WF/PC-2 8390 (Expansion Parallax Distances to Planetary 
Nebulae)

        The WF/PC-2 was used to make observations of the planetary nebula 
BD+30-3639 in order to study its 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.

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

        The WF/PC-2 was used to make snapshot survey observations of the 
crowded center of the galactic globular cluster NGC-6380.  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: 29
Successful: 29

  Scheduled Re-acquisitions: 18
Successful: 18

    2.2 FHST Updates:
Scheduled: 63
Successful: 63

    2.3 Operations Notes:

        Using ROP SR-1A, the SSR EDAC error counter was cleared twice.

        There was a STIS EMC retry at 063/222805Z.  The STIS flight 
software error counter was cleared at 063/2322Z as directed by ROP NS-12.

        The NICMOS FPA temperature sensor for detector 3 was enabled at 
064/2003Z.

        Per ROP IC-2, SSA transmitter #1 was turned on and off at 065/2258Z.

        The Science Mission Specification for the week beginning early this 
morning was re-processed over the weekend in order to insert a Target of 
Opportunity that will observe a gamma ray burst with the STIS instrument 
from 066/0432Z until 066/1154Z.  Due to the pointing and new data 
requirements of this late addition, fifteen TDRSS scheduling changes were 
successfully processed.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW