HUBBLE SPACE TELESCOPE

   DAILY REPORT #2588

PERIOD COVERED:  0000Z (UTC) 03/24/00 - 0000Z (UTC) 03/27/00

Daily Status Report as of 087/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Two Sets of 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 stars HD220057 and HD111934 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.

    1.2 Completed Five 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 STIS/CCD 8474 (Coronographic Imaging of Protoplanetary Disks)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
broad-band optical coronographic imaging that will be used to search for 
circumstellar disks and indirect signatures of the presence of massive 
planets toward the nearby Herbig Ae/Be and T Tauri stars.  The observations 
completed with no reported problems.

    1.4  Completed WF/PC-2 8459 (Decontaminations and Associated 
Observations Pt. 2/2)

        The WF/PC-2 was used to perform the monthly decons.  Also included 
are instrument monitors tied to decons: photometric stability check, focus 
monitor, pre- and post-decon internals {bias, intflats, kspots, & darks}, 
and UV throughput checks.  The observations were completed nominally.

    1.5 Completed Four 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.

    1.6 Completed Four Sets of STIS/CCD 8437 (Dark Monitor-Part 2 C8)

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

    1.7 Completed STIS/MA1 8426 (Cycle 8 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA1) was used to make a 
routine Cycle-8 MAMA dark noise calibration measurement.  This proposal 
will provide the primary means of checking on the health of the MAMA 
detectors.  This is done through frequent monitoring of the background 
count rate.  The observations were completed as planned, and no problems 
were reported.

    1.8 Completed Three 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-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.

    1.9 Completed Ten 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.

    1.10 Completed Two Sets of WF/PC-2 8325 (Galaxy Evolution in 
Low-Density Environments: WFPC2 Imaging of Poor X-Ray Clusters at z=0.2-0.3)

        The WF/PC-2 was used to obtain high quality morphological 
information on galaxies within 9 X-ray-selected poor clusters at z=0.2-0.3. 
These morphologies will be combined with information on the stellar 
populations of the galaxies from our on-going spectroscopic survey of these 
systems to provide a complete view of the morphological and spectral 
evolution of galaxies within these clusters.   The observations completed 
nominally.

    1.11 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.

    1.12 Completed Three 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-6364, NGC-3684, and NGC-4536 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 Two Sets of WF/PC-2 8146 (A Search for Binary L-Dwarfs)

        The WF/PC-2 was used to search for close binaries amongst the 
sample of 37 low-temperature L dwarfs, identified primarily in the course 
of the DENIS and 2MASS near-infrared surveys.  The observations completed 
with no reported problems.

    1.14 Completed Two Sets of STIS/CCD/MA1/MA2 8484 (Physical Properties 
of H I AND H II Regions)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to observe Interstellar absorption lines within the wavelength 
intervals 1170-1370A and 1630-1890A in the spectra of 10 early-type 
stars.  The following objectives were achieved: {1} to measure the 
populations of the fine-structure levels of O I, C I and Si II within H I 
and H II regions, {2} to determine the ionization ratios Al I/Al III {the 
Al II line will probably be too saturated}, S I/S II/S III, and Si I/Si 
II/Si III, and {3} to measure the abundances of Mg, O, S, Ni and Si from 
unsaturated lines arising from their preferred ionization stages in H I 
regions. Objectives {1} and {2} should define local kinetic temperatures, 
densities of H atoms {both neutral and ionized}, and also the ratios of uv 
ionizing photons to electrons.  The proposal completed nominally.

    1.15 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.

    1.16 Completed STIS/CCD/MA1/MA2 8188 (Snapshot Spectroscopic Diagnostic 
Survey of the Symbiotic Stars)

        The Space Telescope imaging Spectrograph (CCD, MA1 and MA2) was 
used to make ultraviolet observations of star V1016-CYG as part of a 
snapshot spectroscopic diagnostic survey of symbiotic stars.  Using these 
data we will be able to establish meaningful statistical limits on the 
nature of hot component sources of ionization and fundamental wind 
parameters, which are vital steps toward understanding the accretion 
hydrodynamics and the evolutionary status of symbiotic systems.  A 
wavelength calibration image was also taken.  The observations were 
executed as scheduled, and no anomalies were noted.

    1.17 Completed STIS/CCD/MA1/MA2 8321 (Coordinated STIS/AXAF 
Spectroscopy of UV/X-ray Absorption in the Seyfert 1 Galaxy NGC 4051)

        The Space Telescope Imaging Spectrograph (CCD , MA1 and MA2) was 
used to  make x-ray studies of the nearby Seyfert 1 galaxy NGC 4051 which 
has revealed strong and complex absorption by ionized nuclear gas.  This 
gas is a major component of the nuclear environment, and we will soon use 
AXAF to make the first grating-resolution study of the X-ray warm absorber 
in NGC 4051.  The observations completed nominally.

    1.18 Completed Four 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.

    1.19 Completed WF/PC-2 6698 (High Resolution Imaging of Bubble and 
Superbubbles in H II Regions)

        The WF/PC-2 was used to make high resolution observations of the H 
II region N44-HOPR.  Massive stars dynamically interact with their ambient 
interstellar medium via fast stellar winds during their lifetime and via 
supernova blasts at their demise.  The dynamical interaction causes the 
physical structure of an H II region to evolve along with its ionizing 
massive stars.  The observations were executed as scheduled, and no 
anomalies were noted.

    1.20 Completed Two 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.

    1.21 Completed Two Sets of STIS/CCD 8796 (POMS Test Proposal: STIS 
Non-Scripted Parallel Proposal Continuation IV)

        The Space Telescope Imaging Spectrograph (CCD) was used in the 
parallel mode to make some low galactic latitude archive observations.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.22 Completed WF/PC-2 8095 (Accurate Proper Motions of Galactic Halo 
Populations)

        The WF/PC-2 was used to make observations of the galaxy PAL4-CENTE 
in order to study the proper motion of its galactic halo population, which 
include globular clusters and dwarf galaxies.  The proper motions of these 
populations will be determined to unprecedented accuracy, approximately an 
order of magnitude better than has been previously possible.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.23 Completed STIS/CCD/MA1 8787 (Far-UV Spectroscopy of Young Solar 
Analogues)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used 
obtain E140M spectra of two young solar analogue HD 43162 which is also 
being observed with EUV.E.  The proposal completed with no reported anomalies.

    1.24 Completed WF/PC-2 8199 (Local Cosmology: The Nearby Flow Field and 
its Structure)

        The WF/PC-2 was used to make observations of the galaxy UGC03755 in 
order to study its nearby flow field and structure.  Very little data are 
available to constrain the velocity field of galaxies in the local 
neighborhood {<= 500 km/sec}.  The observations were executed as scheduled, 
and no anomalies were noted.

    1.25 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.

    1.26 Completed Two Sets of 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.

    1.27 Completed STIS/CCD 8217 (Tests of Stellar Models Using Four 
Extremely Massive Spectroscopic Binaries in the R136 Cluster)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
four non-interacting double-lined spectroscopic binaries discovered in the 
R136 cluster by the Cycle 6 FOS spectroscopy.  The proposal completed 
nominally.

    1.28 Completed STIS/CCD 8416 (CCD Full-Field Sensitivity Monitor C8)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of globular cluster NGC-5139 (a.k.a., Omega Cen) as part of a 
CCD Full-Field Sensitivity Monitor (Cycle 8).  These observations also 
provide a check of the astrometric and point spread function stability of 
the instrument over its full field of view.  The observations were 
completed as planned, and no anomalies were reported.

    1.29 Completed STIS/CCD 8236 (Black Holes and Gas Disks in a Complete 
Sample of Radio-Loud Ellipticals - II: Kinematics)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
observations of the radio-loud elliptical galaxy NGC-4261.  From these 
observations we will measure the black hole masses, determine the nature, 
kinematics, and structure of the central gas disks and obtain a modeled 
upper limit to their mass accretion rates.  A wavelength calibration image 
was also taken.  The loss of lock detailed in 2.1 and HSTAR 7551 occurred 
during this proposal, about 20 minutes into this two-hour 
proposal.  Otherwise, the observations were completed as planned, and no 
further problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 27
Successful: 27

        Per HSTAR 7551, a loss of lock occurred at 086/203036Z when the 
stop flag appeared for FGS-1.  Fine lock was recovered between 086/203430Z 
and 086/204830Z.  The proposal described in 1.29 was affected.
  Scheduled Re-acquisitions: 22
Successful: 22

    2.2 FHST Updates:
Scheduled: 69
Successful: 69

    2.3 Operations Notes:

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

        There was a STIS EMC re-try at 085/044304Z.  The STIS flight 
software error counter was re-set at 085/0535 as directed by ROP NS-12.

        HSTAR 7549 describes an FHST map, scheduled for 085/204500Z, that 
failed when stars were not found in FHST-2.  A previous map at the same 
attitude had worked.

        ESTR-2 reconditioning was performed at 086/0054Z.

        The NICMOS FPA temperature sensor for detector 2 was enabled at 
086/1406Z.

        Per HSTAR 7550, the map scheduled for 086/1558Z failed when stars 
were not located in FHST-1.  Again, a previous map at the same attitude had 
achieved success.

        A TTR was written for a 1.5 minute segment of data, beginning at 
086/1849Z, that was noisy.  The data was later recovered.

        The AER was set at 087/0014Z to avoid a period of possible 
engineering data loss.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW