HUBBLE SPACE TELESCOPE

   DAILY REPORT #2808

PERIOD COVERED:  0000Z (UTC) 02/13/01 - 0000Z (UTC) 02/14/01

Daily Status Report as of 045/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Three Sets of WF/PC-2 8827 (Cycle 9 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 proposal completed nominally.

    1.2 Completed WF/PC-2 8602 (A Snapshot Survey of the Sites of Recent, 
Nearby Supernovae)

        The WF/PC-2 was used to conduct a snapshot survey in V and I of the 
sites of the nearby SNe, which have precisely known positions, to obtain 
high-resolution information on their local environment.  The proposal 
completed with no reported problems.

    1.3 Completed Five Sets of STIS/CCD 8562 (Probing the Large Scale 
Structure: Cosmic Shear Observations)

        The Space Telescope Imaging Spectrograph (CCD) was used to probe 
the distortion of light bundles from distant galaxies, looking at the 
statistical properties of the intervening inhomogeneous {dark} matter 
distribution.  The proposal completed nominally.

    1.4 Completed Three Sets of STIS/CCD 8837 (CCD Dark Monitor-Part 1)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the darks.  The proposal completed with no reported problems.

    1.5 Completed STIS/CCD/MA2 8612 (Boron in the Lithium-Rich K-Giants: A 
Critical Test of Deep Stellar Mixing Versus Brown-Dwarf Ingestion)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
observe the B I 2500Angstrom lines in four Li-rich K- giants using HST with 
STIS/G230M in order to test two different evolutionary scenarios invoked to 
explain the high Li abundances: the cool bottom process versus the possible 
accretion of brown dwarfs/planets.  There were no reported problems.

    1.6 Completed Two Sets of WF/PC-2 8805 (POMS Test Proposal: WFII 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used to perform a generic target version of the 
WFPC2 Archival Pure Parallel program.  The program will be used to take 
parallel images of random areas of the sky, following the recommendations 
of the Parallels Working Group.  The proposal completed with no reported 
problems.

    1.7 Completed STIS/CCD/MA2 8770 (The Nucleosynthesis of Boron - 
Benchmarks for the Galactic Disk)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
determine boron (B) abundance.  In spite of several HST cycles of B 
abundance determinations, we do not know the true, ambient, present-day 
abundance of B.  Only two stars {with undepleted Li and Be} have been 
observed to derive the Population I true B abundance.  Past cycles have 
focused on {1} halo stars with low metallicity and {2} solar-type stars 
with Li and/or Be deficiencies.  In this proposal, the stellar abundances 
of B will be determined, measured from the B I 2497 Angstrom line from STIS 
echelle spectra, of main sequence F-G stars that have retained their full 
initial abundances of boron.  Our target stars are those for which 
ground-based observations show that beryllium is undepleted.  These new 
abundances will map evolution of the B abundance in the Galactic disk in 
the metallicity range from one-third solar up to solar.  Then the B, and 
previously determined Li and Be abundances, will be used to improve 
understanding of the nucleosynthesis of B.  There were no reported anomalies.

    1.8 Completed STIS/CCD/MA2 8569 (A New Survey for Low-Redshift Damped 
Lyman-Alpha Lines in QSO MgII Systems)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
support studies which have shown that most of the observable neutral gas 
mass in the Universe resides in QSO damped LyAlpha {DLA} systems.  However, 
at low redshift , DLA can only be found by searching in the UV with 
HST.  By boot-strapping from the MgII statistics, we will be able to 
further improve the determination of the low- redshift statistical 
properties of DLA {their incidence and cosmological mass density} and open 
up new opportunities for studies at low redshift.  The observations 
completed nominally.

    1.9 Completed WF/PC-2 8812 (Cycle 9 Internal Monitor)

        The WF/PC-2 was used to obtain routine internal monitors for WFPC2 
in order to monitor the health of the cameras.  A variety of internal 
exposures are obtained in order to provide a monitor of the integrity of 
the CCD camera electronics in both bays {gain 7 and gain 15}, a test for 
quantum efficiency in the CCDs, and a monitor for possible buildup of 
contaminants on the CCD windows.  There were no reported problems.

    1.10 Completed STIS/CCD 8838 (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.  The proposal completed nominally.

    1.11 Completed WF/PC-2/STIS/CCD 8577 (Ozone, Condensates, and Dust in 
the Martian Atmosphere)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were 
used to study the spatial and seasonal variations in ozone, condensates, 
and dust in the Martian atmosphere.  The data obtained promise to be 
critical in addressing recent breakthroughs in understanding the basic 
radiative, transport, and microphysical processes that provide for both 
long-term and short-term balance within the global Mars climate 
system.  There were no reported problems.

    1.12 Completed STIS/MA2 8843 (Cycle 9 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA2) was used to perform 
the routine monitoring of the MAMA detector dark noise.  The proposal 
completed nominally.

    1.13 Completed WF/PC-2 8725 (The Formation Epoch{s} of Globular 
Clusters Around Ellipticals from Ultraviolet Photometry)

        The WF/PC-2 was used to study the formation history of elliptical 
galaxies by obtaining far-UV photometry of their globular clusters.  The 
far-UV photometry will be used in conjunction with existing optical data to 
constrain the ages of these clusters, and thus the formation epochs of 
their host galaxies.  There were no reported problems.

    1.14 Completed WF/PC-2/STIS/CCD 8679 (Constraining the Age of the 
Oldest Stars from the White Dwarf Cooling Sequence in M4)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were 
used to search for the oldest and hence coolest white dwarfs {WDs} in M4, 
the nearest Galactic globular cluster to the Sun.  New models for cooling 
hydrogen white dwarfs predict that their colors should become bluer, rather 
than redder, with increasing age. The goal is to test these models and at 
the same time constrain the age of M4.  The proposal completed with no problems

    1.15 Completed WF/PC-2 8581 (A Search For Low-Mass Companions To 
Ultracool Dwarfs)

        The WF/PC-2 was used to search for very low-mass {VLM} companions 
to a complete sample of 120 late-M and L dwarfs, drawn mainly from the 
2MASS and SDSS surveys.  The primary goal is to determine the multiplicity 
of M < 0.1 M_odot dwarfs.  In particular, we aim to identify binary systems 
suitable for long-term astrometric monitoring and mass measurement, and 
systems with cool, sub-1000K companions.  The proposal completed with no 
reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  5
Successful:  5

  Scheduled Re-acquisitions: 10
Successful: 10

    2.2 FHST Updates:
Scheduled: 11
Successful: 11

    2.3 Operations Notes:

        The SSR EDAC error counter was cleared twice per ROP SR-1A.

        A TTR was written for a required re-transmit during a NSSC-1 load 
uplink at 044/210103Z.

        SI C&DH erros were reset at 044/2106Z, using ROP NS-5.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW