Hubble Space Telescope Daily Report #2780 01/05/01

HUBBLE SPACE TELESCOPE
 
  DAILY REPORT #2780
 
PERIOD COVERED:  0000Z (UTC) 01/04/01 – 0000Z (UTC) 01/05/01
 
Daily Status Report as of 005/0000Z
 
1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:
 
    1.1 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.
 
    1.2 Completed WF/PC-2 8815 (Cycle 9 Earth Flats)
 
        The WF/PC-2 was used to monitor flatfield stability.  This proposal obtains sequences of Earth streak flats to construct high quality flat fields for the WF/PC-2 filter set.  These flat fields will allow mapping of the OTA illumination pattern and will be used in conjunction with previous internal and external flats to generate new pipeline superflats.  The proposal completed nominally.
 
    1.3 Completed WF/PC-2 8563 (Determining the Duplicity of Nearby T Dwarfs {Methane Brown Dwarfs})
 
        The WF/PC-2 was used to investigate the binary fraction of T-type dwarfs {methane brown dwarfs} which is crucial to accurate determinations of the T-dwarf space density and mass function, especially since equal- magnitude binaries can introduce significant biases in photometric distance estimates.  The proposal completed nominally.
 
    1.4 Completed Two Sets of STIS/CCD 8562 (Probing the Large Scale Structure: Cosmic Shear Observations)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to probe the distortion of light bundles from distant galaxies, looking at the statistical properties of the intervening inhomogeneous {dark} matter distribution.  The proposal completed nominally.
 
    1.5 Completed STIS/CCD 8838 (Bias Monitor – Part 1)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to monitor the bias in the 1×1, 1×2, 2×1, and 2×2 bin settings at gain=1, and 1×1 at gain = 4, to build up high-S/N superbiases and track the evolution of hot columns.  The proposal completed nominally.
 
    1.6 Completed WF/PC-2/STIS/CCD 8560 (Large Scale Structure at z ~ 0.9)
 
        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were used to obtain deep, broad-band red images of three fields within a supercluster at z ~ 0.9 in order to study the morphological properties of galaxies within a high-redshift large scale structure.  Because significant evolution has already been observed in galaxy populations at this redshift, these observations will provide a crucial link between the global properties of large scale structure and galaxy-scale physics.  No problems were identified.
 
2.0 FLIGHT OPERATIONS SUMMARY:
 
    2.1 Guide Star Acquisitions:
        Scheduled Acquisitions:  4
Successful:  4
 
        Scheduled Re-acquisitions:  9
Successful:  9
 
    2.2 FHST Updates:
                  Scheduled: 11
Successful: 11
 
    2.3 Operations Notes:
 
        The Science Mission Specification, containing normal science operations, began execution at 004/1400Z.  Since recovery from the safemode event, all subsystems and instruments have been operating nominally.
 
        Using ROP SR-1A, the SSR EDAC error counter was cleared at 004/0647Z
 
        The SSR was set to the autonomous engineering record mode for the interval 004/1254Z to 004/1434Z as directed by ROP SR-8A.
 
        Per ROP IC-2, SSA transmitter #2 was turned on at 004/165938Z and tutned off at 004/170608Z.
 
3.0 SIGNIFICANT FORTHCOMING EVENTS:
 
        Continuation of normal science observations and calibrations.