HUBBLE SPACE TELESCOPE

   DAILY REPORT #2812

PERIOD COVERED:  0000Z (UTC) 02/19/01 - 0000Z (UTC) 02/20/01

Daily Status Report as of 051/0000Z

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 Two 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.

    1.3 Completed Two Sets of WF/PC-2/STIS/MA1 8686 (LINERs in Early-type 
Galaxies: Ionized by the UV-upturn Population?)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (MA1) were 
used to investigate the presence of extended ionized gas with LINER spectra 
in a large fraction {60-70%} of early-type galaxies.  The observations 
completed with no reported anomalies.

    1.4 Completed WF/PC-2 8816 (Cycle 9 UV Earthflats)

        The WF/PC-2 was used to obtain sequences of Earth streak flats to 
improve the quality of pipeline flat fields for the WFPC2 UV filter set and 
in order to monitor flat field stability.  There were no reported problems.

    1.5 Completed Two Sets of WF/PC-2 8823 (Decontaminations and Associated 
Observations Pt. 2/4)

        The WF/PC-2 was used for the monthly WFPC2 decons.  Also included 
were instrument monitors tied to decons: photometric stability check, focus 
monitor, pre- and post-decon internals {bias, intflats, kspots, & darks}, 
UV throughput check, VISFLAT sweep, and internal UV flat check.  There were 
no reported problems.

    1.6 Completed Two Sets of STIS/CCD 8664 (Structural Measurement of 
Globular Clusters in M31 and NGC 5128: Stalking the Fundamental Plane)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
in the snapshot mode to image a wide selection of individual globular 
clusters in two other large galaxies {M31 and NGC 5128} for measurement of 
their structural parameters {r_c, c, central surface brightness}.  We will 
use these to compute their binding energies and define the FP in these two 
galaxies. Comparison with the Milky Way will then give us powerful new 
information on just how ``universal'' the cluster formation process was in 
the early protogalaxies.  The observations completed with no reported problems.

    1.7 Completed STIS/MA1 8344 (UV Spectral Properties of O and B Stars 
Versus Metallicity)

        The Space Telescope Imaging Spectrograph (MA1) was used to perform 
slitless UV spectroscopy of bright OB associations in three Local Group 
galaxies that span a factor of 30 in metallicity.  Our target is 
star-forming regions in Sextans A.  Metallicity is the most fundamental 
parameter governing both stellar and galactic evolution.  Yet, little is 
known observationally about how metallicity affects the physics of massive 
stars.  The proposal completed nominally.

    1.8 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.

    1.9 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 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.

    1.11 Completed S/C 5582 (FOC/48 Monthly Activation (Camera Section 
Only): Cycle 4)

         This proposal was executed as scheduled, and no anomalies were 
noted. 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.

    1.12 Completed FOC/96 7923 (FOC F/96 Turn-on)

        The Faint Object Camera (f/96) was used to take an internal flat 
and a dark to ensure that the 30-day limit for the FOC is not 
exceeded.  The observations were executed as scheduled, and no anomalies 
were noted.

    1.13 Completed 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.

    1.14 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.

    1.15 Completed STIS/CCD 8845 (Spectroscopic Flats C9)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
CCD flats in the spectroscopic mode.  The observations completed with no 
reported problems.

    1.16 Completed STIS/CCD/MA1 8662 (A Snapshot Survey of the Hot 
Interstellar Medium)

        The Space Telescope Imaging Spectrograph (CCD And MA1) was used to 
obtain snapshot STIS echelle observations of key tracers of hot 
interstellar gas {C IV, N IV, and Si IV} for selected FUSE Team O VI survey 
targets with known UV fluxes.  By taking advantage of the snapshot 
observing mode we will efficiently obtain a large number of spectra 
suitable for the study of the highly ionized hot component of the 
interstellar medium {ISM}.  Our goals are to explore the physical 
conditions in and distribution of such gas, as well as to explore the 
nature of the interfaces between the hot ISM and the other interstellar gas 
phases.  The observations completed with no reported problems.

    1.17 Completed STIS/CCD/MA2 8627 (Testing Theories Of Wind/Jet 
Production In YSOs)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
test theories of jet/wind production from the accretion disks of low-mass 
young stellar objects, providing new insight into disk physics, accretion 
energy balance, and jet collimation.  Observations of the Fe II ultraviolet 
lines in absorption will probe lower-density and lower-temperature material 
than optical forbidden and permitted emission lines, and thus provide 
unique information on jet/wind launching and 
acceleration.  Velocity-resolved spectra will distinguish between X-wind 
models, in which all the mass ejection occurs from the inner disk edge, and 
disk wind models, where the flow originates from a much larger area of the 
disk.  The proposal completed nominally.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  7
Successful:  7

  Scheduled Re-acquisitions: 10
Successful: 10

    2.2 FHST Updates:
Scheduled: 13
Successful: 13

    2.3 Operations Notes:

        The SSR EDAC error counter was cleared on three occasions per ROP 
SR-1A.

        Using ROP DF-18A, the engineering status buffer was dumped and 
reset at 050/1526Z.

        HST operations returned to CCS-A at 050/2045Z after the upgrade of 
the Network Catalyst card update.

        The ephemeris table was uplinked at 051/0049Z as directed by ROP 
DF-07A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW