HUBBLE SPACE TELESCOPE

   DAILY REPORT #2624

PERIOD COVERED:  0000Z (UTC) 05/15/00 - 0000Z (UTC) 05/16/00

Daily Status Report as of 137/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Two 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.

    1.2 Completed 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.

    1.3 Completed STIS/CCD/MA1/MA2 8424 (MAMA Sensitivity and Focus Monitor C8)

        The Space Telescope Imaging Spectrograph (CCD, MA1 and MA2) was 
used to make observations of object BD+28D4211 in order to measure the 
sensitivity and to focus monitor C8.  This also is to monitor sensitivity 
of each MAMA grating mode to detect any change due to contamination or 
other causes, and to monitor the STIS focus in a spectroscopic mode.  A 
wavelength calibration was also taken.  The observations were completed as 
planned, and no anomalies were reported.

    1.4 Completed Three 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.  The proposal completed with no reported problems.

    1.5 Completed Six Sets of WF/PC-2 8442 (Cycle 8 Standard Darks)

        The WF/PC-2 was used to obtain dark calibration dark frames every 
week in order to provide data for the ongoing calibration of the CCD dark 
current rate, and to monitor and characterize the evolution of hot 
pixels.  Over an extended period these data will also provide a monitor of
radiation damage to the CCDs.  The proposal completed with no reported 
anomalies.

    1.6 Completed 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 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.

    1.8 Completed Three Sets of STIS/CCD 8808 (POMS Test Proposal: STIS 
Non-Scripted Parallel Proposal Continuation III)

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
non-scripted, parallel observations as part of a POMS test proposal.  The 
observations completed with no anomalous activity.

    1.9 Completed Two Sets of STIS/CCD 8798 (Read Noise Monitor)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
the read noise of the STIS CCD using pairs of bias frames.  The proposal 
completed nominally.

    1.10 Completed FGS 8292 (Calibrating the Mass-Luminosity Relation at 
the End of the Main Sequence)

        The Fine Guidance Sensor (FGS1R) was used to make astrometric 
observations of the star GJ1215 and other nearby reference stars.  This is 
part of a study to calibrate the mass-luminosity relation for stars less 
massive than 0.2 Msun, with special emphasis on objects near the 
stellar/brown dwarf border.  The observations were completed as planned, 
and no problems were reported.

    1.11 Completed Two Sets of WF/PC-2 8346 (Cosmological Parameters from 
Type Ia Supernovae at High Redshift)

        The WF/PC-2 was used to directly measure the cosmological 
parameters, Omega, Lambda, and thus the curvature, Omega_k, using Type Ia 
supernovae {SNe Ia} as calibrated standard candles.  Observations of SNe Ia 
spanning a large redshift range are key to decoupling Omega and 
Lambda.  The observations completed nominally.

    1.12 Completed Three 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.

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

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

    1.14 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.

    1.15 Completed STIS/CCD 8489 (Searching for the Hydrogen Reionization 
Edge of the Universe at 5HST)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
36 parallel orbits {4--5 fields of 5--8 orbits each} to constrain the H 
Lyman-edge in emission that marks the transition from a neutral to a fully 
ionized IGM.  This edge is due to recombination from the H Lyman series and 
Lyman continuum, and can be used to constrain zion, one of the most 
important unknown quantities in large scale structure and cosmology.  The 
proposal completed nominally.

    1.16 Completed STIS/CCD/MA1 8097 (C IV High Velocity Clouds: Remnants 
of the Local Group?)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to 
make observations of two high clouds {HVCs} in the direction of Mrk 509 
that have unusual ionization properties.  The clouds exhibit strong C IV 
absorption with little or no detectable low ion {C II, Si II} absorption or 
H I 21cm emission.  The observations completed nominally.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 6
Successful: 6

  Scheduled Re-acquisitions: 9
Successful: 9

    2.2 FHST Updates:
Scheduled: 12
Successful: 12

    2.3 Operations Notes:

        The SSR EDAC error counter was reset once per ROP SR-1A.

        Using ROP IC-1, the MA transponder was commanded twice.

        The CCS "A" string pipeline was re-cycled at 136/1342Z.

        The ephemeris tables were uplinked at 137/0241Z as directed by ROP 
DF-07B.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW