HUBBLE SPACE TELESCOPE

  DAILY REPORT #2917

PERIOD COVERED:  0000Z (UTC) 07/18/01 - 0000Z (UTC) 07/19/01

Daily Status Report as of 200/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed STIS/CCD 9121 (Evolution of the Host Galaxies in Low- 
Power AGN)

        The Space Telescope Imaging Spectrograph (CCD) was used to study 
the evolution of low-power AGN host galaxies to z~1.3, allowing the direct 
study of how the formation and life cycles of radio-loud AGN depend on 
intrinsic power.  There were no reported problems.

    1.2 Completed Three 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.

    1.3 Completed Ten 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.

    1.4 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.

    1.5 Completed Two Sets of 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.

    1.6 Completed WF/PC-2 8585 (Cosmological Parameters from Type Ia 
Supernovae at High Redshift)

        The WF/PC-2 was used to measure the cosmological parameters, Omega, 
Lambda, and thus the curvature, Omega_k, using Type Ia supernovae {SNe Ia} 
as calibrated standard candles.  There were no reported problems.

    1.7 Completed Six Sets of STIS/CCD 9248 (Probing the Large Scale 
Structure: Cosmic Shear Observations)

        The Space Telescope Imaging Spectrograph (CCD) was used to measure 
the distortion of light bundles from distant galaxies that probe the 
statistical properties of the intervening inhomogeneous {dark} matter 
distribution.  Its tidal gravitational field distorts the observable image 
shapes thereby causing a coherent ellipticity pattern {Cosmic Shear}.  The 
observations completed nominally.

    1.8 Completed WF/PC-2/STIS/CCD 9174 (Using Optically Faint Radio 
Sources to Pinpoint Dusty Proto-Galaxies)

        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were 
used to observe a number of high redshift, dusty starburst galaxies that 
remain invisible in ground based in the Hubble Deep Field.  These galaxies 
appear as faint radio sources with bright submillimeter counterparts, 
demonstrating they are very dusty systems.  The luminosities of these 
galaxies suggest they are in the process of converting the bulk of their 
gas mass into stars, and will likely evolve into present day massive 
ellipticals.  The observations completed normally, with no reported problems.

    1.9 Completed WF/PC-2 8597 (The Fueling of Active Nuclei: Why are 
Active Galaxies Active?)

        The WF/PC-2 was used to investigate the accretion onto massive 
black holes that are believed to be the energy source for AGN.  However, 
evidence for black holes in quiescent galaxies has also been reported.  Why 
are these galaxies inactive?  One possibility is that active galaxies are 
better at providing fuel to the nuclear region than quiescent 
galaxies.  Other possible fueling mechanisms such as ``bars-within-bars'' 
or nuclear spirals cannot be investigated from the ground because they are 
relatively small features in the ISM.  The observations were completed as 
planned.

    1.10 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.

    1.11 Completed FGS/1R 8727 (Ultra-High Resolution Studies Of Agns III: 
Nuclear Extent And The SIM Astrometric Grid)

        Fine Guidance Sensor #1R was used to perform a follow-up to a pilot 
project (which used the original Fine Guidance Sensor astrometer {FGS3}) to 
study optical extent of several AGN.  Using the significantly enhanced 
performance of the new FGS1R, two high S-N AGN from our earlier sample, 
probing the broad line region at 10mas resolution, will be 
re-observed.  The observations completed with no reported problems.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions: 10
Successful: 10

  Scheduled Re-acquisitions:  7
Successful:  7

    2.2 FHST Updates:
Scheduled: 19
Successful: 19

    2.3 Operations Notes:

        Using ROP SR-1a, the SSR EDAC error counter was cleared twice.

        The 486 engineering status buffer limits were adjusted on two 
occasions per ROP DF-18A.

        Real-time operations were transferred to the STOCC at 200/0300Z due 
to a shut-down of Baltimore roadways due to a rail accident that included a 
toxic chemical spill.

        A TTR was written when two re-transmits, at 199/113426Z and at 
199/113706Z, were required during a NSSC-1 uplink.  Later, at 199/1139Z, 
ROP NS-5 was utilized to reset the SI C&DH error counter.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW