Status Report

Hubble Space Telescope Daily Report #2738 10/30/00

By SpaceRef Editor
October 30, 2000
Filed under

HUBBLE SPACE TELESCOPE
 
  DAILY REPORT #2738
PERIOD COVERED:  0000Z (UTC) 10/27/00 – 0000Z (UTC) 10/30/00
 
Daily Status Report as of 304/0000Z
 
1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:
 
    1.1 Completed Eight Sets of STIS/CCD 8851 (Sparse Field CTE test {Cycle 9})
 
        The Space Telescope Imaging Spectrograph (CCD) was used to perform CTE measurements that are made using the "sparse field test", along both the serial and parallel axes.  As described in 2.1 and HSTAR 7934, two re-acquisitions for the third iteration of this proposal failed, the take data flag remained down, and ten observations were lost.  Otherwise, the proposal completed with no other reported anomalies.
 
    1.2 Completed Three Sets of WF/PC-2 8601 (A Snapshot Survey of Probable Nearby Galaxies)
 
        The WF/PC-2 was used to continue the very successful snapshot survey in order to use the high spatial resolution of HST to determine whether selected galaxies are nearby on the basis of resolution into stars, and the magnitudes and colors of the brightest stars.  As described in the previous report and HSTAR 7932, the acquisition for the first iteration of this proposal failed to RGA control, affecting one observation.  Otherwise, there were no further reported problems.
 
    1.3 Completed Six Sets of STIS/CCD 8837 (CCD Dark Monitor-Part 1)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to monitor the darks.  As described in the previous report and HSTAR 7932, the acquisition for the first iteration of this proposal failed to RGA control, affecting one observation.  Otherwise, the proposal completed with no further reported problems.
 
    1.4 Completed Six Sets of WF/PC-2 8826 (Cycle 9 Supplemental Darks pt 1)
 
        The WF/PC-2 was used to perform a T dark calibration program that obtains three dark frames every day in order to provide data for monitoring and characterizing the evolution of hot pixels.  As described in the previous report and HSTAR 7932, the acquisition for the first iteration of this proposal failed to RGA control, affecting one observation.  Otherwise, there were no further reported anomalies.
 
    1.5 Completed STIS/CCD 8172 (STIS Deep DLA Imaging Survey II)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to make deep observations of quasar/alpha galaxy PC0056+012.  The HST imaging, together with ground-based spectroscopy, will unify absorption-line studies and faint galaxy imaging studies, providing a comprehensive picture of the history of assembly, star formation, gas consumption, and chemical enrichment in the Damped Lyman-Alpha galaxies.  The observations were executed as scheduled, and no anomalies were noted.
 
    1.6 Completed Nine 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.
 
    1.7 Completed Three Sets of 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.
 
    1.8 Completed Three Sets of WF/PC-2 8720 (Masses and Multiplicity of Nearby Free- floating Methane and L Dwarfs)
 
        The WF/PC-2 was used to observe 50 very-low-mass objects in the solar neighborhood with spectral types of L0 and later {including several dwarfs with Methane absorption bands in their atmospheres}.  These objects will be observed in two filter bands with the aim to identify close companions, measure their colors, and to obtain first epoch data of the newly discovered binaries.  The observations completed nominally.
 
    1.9 Completed Six Sets of STIS/CCD/MA1 8622 (The Interstellar Isotopic Ratio of Boron toward Omicron Persei and Nearby Sight Lines)
 
        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to determine the isotopic ratio 11B/10B for diffuse interstellar material along lines of sight to o Persei, 40 Persei, Zeta Persei, and X Persei that pass close to the star- forming region IC 348.  The proposal completed nominally.
 
    1.10 Completed STIS/CCD 8846 (Imaging Flats C9)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to investigate flat-field stability over a monthly period.  The proposal completed nominally.
 
    1.11 Completed STIS/CCD 8845 (Spectroscopic Flats C9)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to obtain CCD flats in the spectroscopic mode.  The observations completed with no reported problems.
 
    1.12 Completed WF/PC-2 8584 (Calibrating the Metallicity Dependence of the Cepheid PL Relation)
 
        The WF/PC-2 was used to determine the uncertainty in the metal abundance dependence of the Cepheid PL relation that remains as one of the largest sources of systematic error in the Cepheid distance scale and in the extragalactic distance scale as a whole.  As described in 2.1 and HSTAR 7934, two re-acquisitions for this proposal failed, the take data flag remained down, and four observations were lost.  Otherwise, there were no other reported problems.
 
    1.13 Completed Four Sets of STIS/CCD 8631 (Bright Quasar Close Lensing Search II)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to expand the Cycle 8 second generation HST snapshot survey of bright quasars, optimized to find lenses with component image separations < 1".  The observations completed nominally.
 
    1.14 Completed WF/PC-2 8632 (A UV Atlas of Nearby Galaxies)
 
        The WF/PC-2 was used to perform a snapshot survey of local galaxies at UV wavelengths with the F300W filter.  The aim of the project is to build a reference UV Atlas of normal galaxies, whose optical images are well known, with the highest possible degree of information, covering all the morphological types and luminosity classes.  The proposal completed normally.
 
    1.15 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.
 
    1.16 Completed STIS/CCD 8228 (The Black Hole Versus Bulge Mass Relationship in Spiral Galaxies)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to make observations of the galaxy NGC-1300 in order to study the black hole versus bulge mass relationship in spiral galaxies.  A wavelength calibration image was also taken.  The observations were executed as scheduled, and no anomalies were noted.
 
    1.17 Completed STIS/CCD 8872 (Spectroscopy of a New Hot spot in SN 1987A)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to take images and diagnostic spectra in the 2900–10250 A range of
rapidly-evolving hot spots and other shock features in the equatorial ring surrounding SN 1987A.  A combination of aperture positions through the low and high resolution gratings will provide resolved data on all known and any new hot spots in all optical emission lines.  There were no reported problems.
 
    1.18 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.
 
    1.19 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.
 
    1.20 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.  Operations personnel reported that there were some observation failures occurring during this proposal.  Otherwise, the proposal completed with no other reported problems.
 
2.0 FLIGHT OPERATIONS SUMMARY:
 
    2.1 Guide Star Acquisitions:
      Scheduled Acquisitions: 24
Successful: 24
 
  Scheduled Re-acquisitions: 26
Successful: 24
        Per HSTAR 7934, the re-acquisitions at 301/2001Z and at 301/2137Z failed to RGA control due to high attitude errors.  After the uplink of an attitude reference update (using COP 3.06A) at 301/222049Z, the following re-acquisition was successful.  The proposals detailed in 1.1 and 1.12 were affected.
 
    2.2 FHST Updates:
Scheduled: 53
Successful: 53
    2.3 Operations Notes:
 
        Using ROP SR-1A, the SSR EDAC error counter was cleared ten times.
 
        On three occasions, using ROP DF-18A, the engineering status buffer limits were adjusted.
 
        The NICMOS 28V bus volts IN – side 1 continues to flag
out-of-limits intermittently.
 
        A TTR was written for a needed re-transmission at 301/114448Z.
 
        Per ROP NS-5, SI C&DH errors were reset at 301/1149Z.
 
        The SSR science playback pointer was set at 301/2159Z as directed by ROP SR-3.
 
        SSA transmitter #1 was turned on at 301/2200Z and turned off at 301/2221Z, per ROP IC-2.  Using the same ROP, SSA transmitter #2 was turned on at 301/2245Z and turned off at 301/2307Z.  Later, the same transmitter was turned on at 302/1647Z and turned of fat 302/1716Z.
 
        HSTAR 7935 states that the software limit for the main bus voltage flagged out-of-limits, reaching a value of 32.712 (limit is 32.71), at 302/213148Z for one 12-second sample.
 
        At 303/061454Z the magnetic and gravity gradient torque for body vector 2 began to flag out-of-limits low.  HSTAR 7936 was written.  There was not SAA event at the time.  Previous HSTARs (6118 and 5776) described similar events.
 
        HSTAR 7937 documents another WF/PC-2 shutter anomaly occurring at 303/191113Z.
 
        Operations personnel noted that there were some astrometry observations failures occurring during the proposal described in 1.20.
 
3.0 SIGNIFICANT FORTHCOMING EVENTS:
 
        Continuation of normal science observations and calibrations.

SpaceRef staff editor.