HUBBLE SPACE TELESCOPE

   DAILY REPORT #2614

PERIOD COVERED:  0000Z (UTC) 05/01/00 - 0000Z (UTC) 05/02/00

Daily Status Report as of 123/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Three 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 Two 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.

    1.3 Completed WF/PC-2/STIS/CCD/MA2 7334 (The Primordial Abundance of 
Deuterium From a Metal-Poor Damped Lyman Alpha System)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD and 
MA1) were used to make observations of the quasar Q2206-1958 to study the 
primordial abundance of deuterium from a metal-poor damped Lyman-Alpha 
system.  It should be possible to detect D absorption in many Lyman series 
lines and the chance of contamination by interloper H clouds is reduced by 
a factor of > 150.  A wave length calibration image was also taken.  The 
observations were executed as scheduled, and no anomalies were noted.

    1.4 Completed Three 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.

    1.5 Completed STIS/CCD 8806 (Spectroscopy of a New Hot spot in SN 1987A)

        The Space Telescope Imaging Spectrograph (CCD) was used to take 
diagnostic spectra of a newly-developing hot spots in the equatorial ring 
surrounding SN 1987A.  The proposal completed with no reported problems.

    1.6 Completed 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.

    1.7 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.

    1.8 Completed WF/PC-2 8100 (Calibration of Nearby Type Ia Supernovae as 
Standard Candles: The Next Step)

        The WF/PC-2 was used to continue the calibration experiment for 
M{max} of type Ia supernovae {SNe Ia} by determining Cepheid distances to 
their parent galaxies.  The proposal completed nominally.

    1.9 Completed Three 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.  As described in HSTAR 7583 and 2.1, a re-acquisition 
occurring during the final iteration of this proposal failed, affecting one 
observation.  Otherwise, the observations were completed as planned, and no 
further anomalies were reported.

    1.10 Completed WF/PC-2 8268 (Lensed Quasar Hosts at High Redshift)

        The WF/PC-2 was used to make observations of the high redshift, 
lensed quasar BR10952-01.  Gravitational lensing offers a novel way to 
detect quasar host galaxies at z > 1 and to measure their properties.  The 
observations were completed as scheduled, and no anomalies were reported.

    1.11 Completed WF/PC-2 8457 (UV Earth Flats)

        The WF/PC-2 was used to obtain a series of Ultraviolet Earth 
flats.  The observations were completed with no reported problems.

    1.12 Completed WF/PC-2 8175 (A Survey of Gravitational Lenses as 
Cosmological Tools III)

        The WF/PC-2 was used to make observations of the gravitational lens 
system 0047-2808.  Gravitational lenses are powerful tools for studying 
cosmology, galactic structure, and galaxy evolution.  As described in HSTAR 
7583 and 2.1, a re-acquisition occurring during this proposal failed, 
affecting two observations.  Otherwise, the observations were completed as 
planned, and no further anomalies were reported.

    1.13 Completed WF/PC-2 8609 (Host Galaxy Luminosities of the Most 
Luminous QSOs)

        The WF/PC-2 was used to determine the factors that decide whether a 
galaxy is host to a luminous QSO?  Recent evidence indicates that host 
galaxy spheroid mass is a key factor: we want to test the relationship 
between host galaxy and QSO luminosity at the highest feasible QSO 
luminosities by measuring the luminosities and profiles of host galaxies 
for QSOs with -25.8 > M_V > -27.6.  Current data in this area are 
conflicting.  The observations completed with no reported anomalies.

    1.14 Completed 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.

2.0 FLIGHT OPERATIONS SUMMARY:

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

  Scheduled Re-acquisitions: 10
Successful:  9

        As documented in HSTAR 7583, the re-acquisition scheduled for 
122/193452Z failed to RGA control when both the scan step limit was 
exceeded and the stop flag was set for FGS-1.  The preceding map showed 
small errors and the initial acquisition was successful.  The proposals 
described in 1.9 and 1.12 were affected.

    2.2 FHST Updates:
Scheduled: 15
Successful: 15

    2.3 Operations Notes:

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

        SSA transmitter 2R was turned on and off on three occasions as 
directed by ROP IC-2.

        The regularly scheduled ephemeris uplinks were delayed due to the 
fact that the CCS "B" sting SAC is currently non-functional.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW