HUBBLE SPACE TELESCOPE

   DAILY REPORT #2827

PERIOD COVERED:  0000Z (UTC) 03/12/01 - 0000Z (UTC) 03/13/01

Daily Status Report as of 072/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 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.

    1.2 Completed Four Sets of STIS/CCD 8864 (CCD Dark Monitor-Part 2)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the darks for the CCD.  The proposal completed nominally.

    1.3 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.

    1.4 Completed Two Sets of STIS/CCD 8865 (Bias Monitor-Part 2)

        The Space Telescope Imaging Spectrograph 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 anomalous activity.

    1.5 Completed Two Sets of WF/PC-2 8583 (Imaging Snapshots of Asteroids)

        The WF/PC-2 was used to obtain images of the fifty largest main 
belt asteroids that have favorable apparitions during cycle 9.  The images 
will be searched for companion bodies, as well as mineralogical variegation 
on the resolved main bodies.  There were no reported problems

    1.6 Completed Six 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.

    1.7 Completed Two Sets of STIS/CCD 8591 (The Smallest Nuclear Black Holes)

        The Space Telescope Imaging Spectrograph (CCD) was used to observe 
small nuclear black holes which are the last major unexplored part of BH 
parameter space, searching for the smallest BHs that HST can possibly 
find.  The proposal completed with no reported anomalies.

    1.8 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.

    1.9 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.

    1.10 Completed Six 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.

    1.11 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.

    1.12 Completed Two Sets of STIS/MA1/MA2 8843 (Cycle 9 MAMA Dark 
Measurements)

        The Space Telescope Imaging Spectrograph (MA1 and MA2) was used to 
perform the routine monitoring of the MAMA detector dark noise.  The 
proposal completed nominally.

    1.13 Completed STIS/CCD 8623 (HST, Chandra, and FUSE Studies of 
Interstellar Material toward HD 24534 {aka X Persei})

        The Space Telescope Imaging Spectrograph (CCD) was used to make 
high-resolution UV spectroscopic observations of the reddened star HD 24534 
{aka X Persei}, in order to: {1} establish accurate gas-phase column 
densities for elements other than carbon and oxygen {for which high- 
quality data already exist}, for the purpose of deriving {in conjunction 
with FUSE and Chandra observations} absolute depletions of several key 
elements; and {2} further pursue molecular abundances toward this star, to 
supplement HST/GHRS data obtained earlier which showed that this line of 
sight supports a rich chemistry.  The observations completed nominally.

    1.14 Completed WF/PC-2 8894 (Accretion Disks in the Orion Nebula)

        The WF/PC-2 was used to perform UB-band imaging of the Orion Nebula 
Cluster in order to derive, for the first time, the disk accretion rates of 
the pre-main-sequence objects, and to study with, unprecedented resolution 
and sensitivity the dark silhouette disks.  There were no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  3
Successful:  3

  Scheduled Re-acquisitions: 11
Successful: 11

    2.2 FHST Updates:
Scheduled: 11
Successful: 11

    2.3 Operations Notes:

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

        An operations request was utilized to select the hardware safemode 
recorder at 071/2354Z.

        The ephemeris tables were uplinked at 072/0041Z as directed by ROP 
DF-07A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW