HUBBLE SPACE TELESCOPE

       DAILY REPORT #3062

PERIOD COVERED:  0000Z (UTC) 02/21/02 - 0000Z (UTC) 02/22/02

Daily Status Report as of 053/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Two Sets of STIS/CCD 9128 (A Snapshot Survey of 
Absorption Lines from High Velocity Clouds in the Milky Way)

        The Space Telescope Imaging Spectrograph (CCD) was used to search 
for Mg II and Mg I absorption from Galactic High Velocity Clouds {HVCs} 
along the sightlines of 51 of the brightest QSOs, BL Lacs and Seyfert 2 
galaxies in the sky.  The observations completed with no reported problems.

    1.2 Completed WF/PC-2 8937 (Cycle 9 Supplemental Darks pt2/3)

        The WF/PC-2 was used obtain three dark frames every day to provide 
data for monitoring and characterizing the evolution of hot pixels.  No 
problems were encountered.

    1.3 Completed STIS/CCD 8901 (Dark Monitor-Part 1)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the darks.  There was no anomalous activity.

    1.4 Completed Three Sets of STIS/CCD 9088 (Next Generation Spectral 
Library of Stars)

        The Space Telescope Imaging Spectrograph (CCD) was used to produce 
a "Next Generation'' Spectral Library of 600 stars for use in modeling the 
integrated light of galaxies and clusters by using the low dispersion UV 
and optical gratings of STIS.  The library will be roughly equally divided 
among four metallicities, very low {Fe/H < -1.5}, low {-1.5 < Fe/H < -0.5}, 
near-solar {-0.5 < Fe/H < 0.1}, and super-solar {Fe/H > 0.1}, well-sampling 
the entire HR-diagram in each bin.  Such a library will surpass all extant 
compilations and have lasting archival value, well into the Next Generation 
Space Telescope era.  No problems occurred.

    1.5 Completed Three Sets of STIS/CCD 9317 (Pure Parallel Imaging 
Program: Cycle 10)

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
the default archival pure parallel program for STIS during cycle 10.  There 
were no reported problems.

    1.6 Completed Nine Sets of WF/PC-2 9318 (POMS Test Proposal: WFII 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used to perform the generic target version of the 
WFPC2 Archival Pure Parallel program.  The program was used to take 
parallel images of random areas of the sky, following the recommendations 
of the Parallels Working Group.  As described in 2.1 and HSTAR 8504, the 
acquisition for the fourth iteration of this proposal defaulted to fine 
lock back-up on one FGS only, possibly affecting the observations in that 
iteration.  Then, as documented in HSTAR 8505, further losses of lock and a 
re-acquisition failure occurred during the fifth and sixth iterations, 
affecting a currently undetermined portion of these iterations.  Otherwise, 
there were no further reported problems.

    1.7 Completed STIS/CCD 9070 (A Census of Nuclear Star Clusters in 
Late-Type Spiral Galaxies: II. Spectroscopy and Stellar Populations)

        The Space Telescope Imaging Spectrograph (CCD) was used to 
investigate spiral galaxies that have a prominent star cluster in their 
dynamical center.  Statistics for cluster frequency, size, and luminosity 
remain incomplete.  The proposal completed as planned.

    1.8 Completed STIS/CCD/MA1/MA2 8159 (The UV Spectrum of an Elliptical 
Accretion Disk Devoid of Hydrogen)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to observe AM CVn {HZ 29} which is the prototype of the interacting 
double-degenerate binaries, or so-called Helium Cataclysmic Variables {He 
CVs},  He CVs could be a channel to form Type Ia supernovae.  These are 
short-orbital period systems in which a low-mass He white dwarf orbits a 
more massive white dwarf and transfers matter devoid of hydrogen to an 
accretion disk around that star.  No problems were encountered.

    1.9 Completed WF/PC-2 8941 (Cycle 10 UV Earthflats)

        The WF/PC-2 was used to monitor flat field stability by obtaining 
sequences of earth streak flats to improve the quality of pipeline flat 
fields for the WFPC2 UV filter set.  The proposal had no problems.

    1.10 Completed STIS/MA2 9573 (NUV-MAMA Daily Dark Monitor)

        The Space Telescope Imaging Spectrograph (MA2) was used to perform 
daily monitoring of the NUV MAMA detector dark noise in order to monitor 
the effects of thermal changes on the NUV dark rate.  No problems occurred.

    1.11 Completed STIS/MA2 8590 (UV Imaging and Spectroscopy of Luminous 
Blue Compact Galaxies from z=0 to z=1)

        The Space Telescope Imaging Spectrograph (MA2) was used to observe 
two well-defined samples of low-mass starburst galaxies, one in the local 
universe {z<0.1} and another at intermediate redshifts {0.2 < z < 
0.7}.  Both samples show optical sizes, morphologies, emission line widths, 
and luminosities comparable to those of LBGs at z=3, and are therefore 
probably the best local analogs and testbeds for further study of 
LBGs.  Our main goals are to: {1} explore the morphologies, surface 
brightness distributions, and half-light radii of nearby starforming 
galaxies in the FUV, near Ly-alpha; {2} search for systematic differences 
among UV, optical, and near-IR morphologies and structural parameters; {3} 
investigate the intrinsic emission and absorption spectra near Ly-alpha of 
starbursting dwarf galaxies, with special attention to Ly- alpha profiles 
and interstellar and stellar photospheric absorption from Si II, O I, C II, 
Si IV, and C IV; {4} measure their FUV-optical colors and dust extinction 
properties; and {5} test the hypothesis that low-mass starbursts are the 
local counterparts of LBGs.  As described in 2.1 and HSTAR 8504, the 
acquisition for this proposal defaulted to fine lock back-up on one FGS 
only, possibly affecting the observations.  Otherwise, the observations 
completed normally.

    1.12 Completed STIS/CCD/MA1/MA2 9036 (An Ultraviolet Spectroscopic 
Survey of Star-Forming Galaxies in the Local Universe)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to perform a comprehensive STIS ultraviolet spectroscopic survey of 
star-forming galaxies in the local universe.  The sample covers a broad 
range of morphologies, chemical composition, and luminosity.  The 
observations will provide spectral coverage between 1200 and 3100 Angstrom, 
at a resolution of 100 to 200 kms and S/N of about 30.  The data set will 
allow the proposers to document and quantify the effects of massive stars 
on the interstellar medium and to infer implications for the evolution of 
the host galaxies.  As documented in HSTAR 8505, losses of lock and a 
re-acquisition failure occurred, affecting a currently undetermined portion 
of this proposal.  Otherwise, the proposal completed with no further 
anomalous activity.

    1.13 Completed STIS/CCD 8903 (Bias Monitor - Part 1)

        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.  There were no problems.

    1.14 Completed Two Sets of STIS/MA1 8920 (Cycle 10 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA2) was used to perform 
the routine monitoring of the MAMA detector dark noise, and is the primary 
means of checking on health of the MAMA detectors systems through frequent 
monitoring of the background count rate.  The proposal completed with no 
reported anomalous activity.

    1.15 Completed FGS/1 9168 (The Distances to AM CVn Stars)

        Fine Guidance Sensor (FGS) #1 was used to determine the parallaxes 
and proper motions of the five brightest of the seven known AM CVn 
systems.  AM CVn systems are binaries where mass is transferred from a 
completely hydrogen-deficient, degenerate mass donor to a white dwarf 
primary through a helium accretion disk.  A better understanding of these 
systems is crucial for a number of reasons: (1) to study the late stages of 
binary evolution, (2) to study the effect of chemical composition on the 
physics of accretion discs, (3) to estimate their contribution to the 
Supernovae Ia rate, and (4) to estimate their contribution to the 
gravitational radiation background.  All observations completed with no 
reported problems.

    1.16 Completed Four Sets of FGS/1 9034 (The Masses and Luminosities of 
Population II Stars)

        Fine Guidance Sensor #1 was used to observe the mass-luminosity 
relation {MLR} of Population II stars of which very little is currently 
known.  With the advent of the Hipparcos Catalogue, improved distances to 
many spectroscopic binaries known to be Pop II systems are now 
available.  After surveying the literature and making reasonable estimates 
of the secondary masses, we find 13 systems whose minimum separation should 
be larger than the resolution limit of FGS #1.  The observations completed 
nominally.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 10
    Successful: 10

        Per HSTAR 8504, the acquisition at 052/120706Z defaulted to fine 
lock back-up on FGS-3 only when the scan step limit was exceeded on 
FGS-3.  The proposals described in 1.6 and 1.11 may have been affected.
  Scheduled Re-acquisitions:  5
    Successful:  4

        Following a successful acquisition at 052/134643Z, there were 
multiple losses of lock during the interval 052/1405Z to 052/1450Z.  The 
re-following acquisition at 052/151342Z failed due to the search radius 
limit being exceeded.  The next re-acquisition at 052/165003Z, however, was 
successful but with further losses of lock during guiding.  HSTAR 8505 was 
written.  The proposals detailed in 1.6 and 1.12 were affected but, at this 
time, the extent is unknown.

    2.2 FHST Updates:
    Scheduled: 23
    Successful: 23

    2.3 Operations Notes:

        The STIS flight software error counter was cleared at 052/1456Z per 
ROP NS-12, following the loss of lock events described in 2.1 and HSTAR 8505.

        The CCS limit for SESBSLD (=7) was updated at 052/1548Z, using ROP 
DF-18A.

        Real-time operations transferred to the CCS "A" string at 052/2130Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

         Servicing Mission 3B, currently scheduled for February 28.

        Continuation of normal science observations and calibrations.

/CAW