HUBBLE SPACE TELESCOPE

   DAILY REPORT #2920

PERIOD COVERED:  0000Z (UTC) 07/23/01 - 0000Z (UTC) 07/24/01

Daily Status Report as of 205/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Five Sets of WF/PC-2 8828 (Cycle 9 Supplemental Darks pt3/3)

        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 with no reported problems.

    1.2 Completed Three 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 8683 (Imaging Of Brightest Cluster Galaxies: The 
High End Of The Black Hole Mass Distribution)

        The WF/PC-2 was used to make kinematic black hole detections in 
galaxies to decide whether they indicate that the mass correlates with both 
optical luminosity and radio power.  The observation completed with no 
reported problems.

    1.4 Completed Ten 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.

    1.5 Completed Two Sets of WF/PC-2 9252 (Cycle 10 Clocks On Check)

        The WF/PC-2 was used to perform closure calibration for clocks 'on' 
mode, which obtains dark frames in order to provide data to create a clocks 
'on' super dark calibration reference file, to monitor and characterize the 
evolution of hot pixels, and to obtain standard star observations for 
photometric calibration.  The proposal completed with no reported anomalous 
activity.

    1.6 Completed STIS/CCD 8865 (Bias Monitor-Part 2)

        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 anomalous activity.

    1.7 Completed WF/PC-2 9046 (Black Holes and Bars: A Recipe for Making 
Bulges?)

        The WF/PC-2 was used to obtain multi-color images and (eventually) 
STIS emission line spectroscopy of the nuclear regions of 6 edge-on barred 
spiral galaxies spanning a range of bulge morphologies and bar 
strengths.  The goal is to quantify the amount of vertical heating in the 
nuclei, and to test whether or not bars are indeed destroyed and create a 
bulge if enough mass is accumulated in their centers.  There were no 
reported problems.

    1.8 Completed STIS/CCD 9066 (Closing in on the Hydrogen Reionization 
Edge of the Universe)

        The Space Telescope Imaging Spectrograph (CCD) was used in parallel 
constrain the Hydrogen reionization edge in emission that marks the 
transition from a neutral to a fully ionized IGM at a predicted 
redshifts.  The proposal completed uneventfully.

    1.9 Completed WF/PC-2 8939 (Cycle 10 Internal Monitor)

        The WF/PC-2 was used to calibrate the internal monitor, to be run 
weekly to monitor the health of the cameras.  No problems were encountered.

    1.10 Completed FGS/1 9169 (An Interferometric Harvest of Double 
Degenerates)

        Fine Guidance Sensor #1 was used to observe the white dwarf mass 
and age distributions that hold clues to the star formation history of our 
Galaxy and the age of the disk.  No problems were reported.

    1.11 Completed Four Sets of WF/PC-2 9244 (POMS Test Proposal: WFII 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used to perform a generic target version of the 
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 observations completed with no anomalous 
activity.

    1.12 Completed FGS/1 9234 (Calibrating the Mass-Luminosity Relation at 
the End of the Main Sequence)

        Fine Guidance Sensor #1 was used 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 proposal completed with 
no reported errors.

    1.13 Completed Six Sets of WF/PC-2 8935 (Cycle 10 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.

    1.14 Completed WF/PC-2 9072 (Dynamical Masses of White Dwarfs from 
Resolved Sirius-Like Binaries)

        The WF/PC-2 was used to observe resolved "Sirius-like'' systems 
containing hot white-dwarf companions of cooler main-sequence stars.  It is 
proposed to image them annually in the UV.  No anomalous activity was reported.

    1.15 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.

    1.16 Completed WF/PC-2 9236 (Development And Evolution Of YSO Outflows 
And Jets)

        The WF/PC-2 was used to observe XZ Tauri, HL Tauri, and HH 30, 
three young stars which can be observed simultaneously in a single 
pointing.  Broad-band HST imaging has revealed that the XZ Tauri binary is 
the source of an elongated bubble of emission nebulosity nearly 5" 
long.  In new images of these objects obtained in March 1998, it was 
discovered that the XZ Tau bubble had expanded significantly and had become 
markedly limb-brightened since 1995.  This behavior suggests that we are 
witnessing, for the first time, the earliest stages of development of a 
Herbig-Haro bowshock, perhaps the initial formation of its post-shock 
cooling zone.  It is proposed to test this hypothesis with emission line 
imaging and temporal monitoring of the bubble's size and 
brightness.  Simultaneously with the XZ Tau study, we will observe the jets 
and reflection nebulosities of HH 30 and HL Tauri.  Monitoring of HH 30 is 
particularly important, as our 1998 imaging also revealed that a very large 
reflected light asymmetry has developed in this prototype young stellar 
object accretion disk system.  There was no anomalous activity.

    1.17 Completed WF/PC-2 9160 (Disks and Envelopes of Nearby Nebulous 
Young Stellar Objects: A Snapshot Survey)

        The WF/PC-2 was used to perform a snapshot survey of nearby 
nebulous young stellar objects to study the detailed morphology of the 
their disks and envelopes and probe the effect of inclination on the 
infrared spectral energy distribution of disk/envelope systems.  The 
proposal completed as planned.

    1.18 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.

    1.19 Completed STIS/CCD/MA1 8956 (Pre-SM Calibration)

        The Space Telescope Imaging Spectrograph (CCD and MA1) was used in 
an exercise to prepare for the SMOV-3B program.  Prior to SMOV3B, one 
iteration of proposal 8960 {Jitter Test} for WD 2126+734 will be 
performed.  Also one iteration of 8961 {End of BEA Test} for each new flux 
standard {WD 2126+734, WD 0320-539, WD 0710+741, and WD 0214+568} needed to 
completely cover all possible Bright Earth Avoidance {BEA} dates will be 
exercised.  Finally, one extra standard is added {WD 1407-475} to fill the 
gap around June when WD 0214+568 is too close to the Sun.  This iteration 
of the proposal completed with no reported problems.

    1.20 Completed WF/PC-2/STIS/CCD 8559 (The Role of Dark Matter in 
Cluster Formation and Galaxy Evolution)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were 
used to observe the outer regions of massive clusters that represent 
transitional areas of great cosmological importance where field galaxies 
encounter the steep potential wells of dark matter and baryonic hot 
gas.  Little is known about either the dark matter profile at large radii 
or the morphological properties of infalling galaxies at those redshifts 
where strong evolution is observed in the cluster cores.  The proposal 
completed normally, with no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 12
Successful: 12

  Scheduled Re-acquisitions:  6
Successful:  6

    2.2 FHST Updates:
Scheduled: 28
Successful: 26

        As documented in HSTAR 8280, the full maneuver updates at 
204/162439Z and at 204/162724Z failed due to tracker 3.  However, the 
subsequent acquisition was successful.

    2.3 Operations Notes:

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

        The 486 engineering status buffer limits were adjusted at 205/0415Z 
per ROP DF-18A.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW