HUBBLE SPACE TELESCOPE

   DAILY REPORT #2824

PERIOD COVERED:  0000Z (UTC) 03/07/01 - 0000Z (UTC) 03/08/01

Daily Status Report as of 067/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed 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.

    1.2 Completed Four Sets of WF/PC-2 8811 (Cycle 9 Standard Darks)

        The WF/PC-2 was used to obtain 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 problems.

    1.3 Completed Two Sets of STIS/CCD/MA2 8651 (UV Spectroscopy in the 
Magellanic Bridge: A Typical QSO Absorption Line System?)

        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to 
perform echelle UV absorption line spectroscopy through the Magellanic 
Bridge {near the SMC} to probe the temperature, ionization, and kinematic 
structure in a metal- poor environment like those observed in the early 
universe.  The sightline toward the QSO B0312-770 is especially interesting 
because of the proximity of the absorber  and the radio loud background 
source.  The observations completed nominally.

    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 Group.  The proposal completed with no reported 
problems.

    1.5 Completed Two Sets of WF/PC-2 8817 (Cycle 9 INTFLAT Sweeps and 
Linearity Test)

        The WF/PC-2 was used to obtain INTFLAT observations in order to 
monitor the pixel to pixel flatfield response and provide a linearity 
check.  The INTFLAT sequences, to be done once during the year, are similar 
to those from the Cycle 8 program 8448.  The images will provide a backup 
database in the event of complete failure of the VISFLAT lamp as well as 
allow monitoring of the gain ratios.  The sweep is a complete set of 
internal flats, cycling through both shutter blades and both gains.  The 
linearity test consists of a series of INTFLATs in F555W, in each gain and 
each shutter.  There was no anomalous activity.

    1.6 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.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  9
Successful:  9

  Scheduled Re-acquisitions:  6
Successful:  6

    2.2 FHST Updates:
Scheduled: 14
Successful: 14

    2.3 Operations Notes:

        After WF/PC-2 was recovered at 066/0400Z, the instrument began 
recording images as 066/073543Z.  During the Solid State Recorder dump at 
066/212016Z, errors occurred with messages indicating that there were 
incomplete packets.  Later, at 067/0215Z, PACOR reported that there were 
missing headers.  Recovery from White Sands was attempted 
unsuccessfully.  The data is planned to be re-dumped at 067/1020Z.  HSTAR 
8110 documents these events.

        One three occasions early on day 067, telemetry format "P" was 
activated for SAA passages.

        Using ROP SR-1A, the SSR EDAC error counter was cleared at 067/2305Z.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW