Status Report

Hubble Space Telescope Daily Report #2752 11/17/00

By SpaceRef Editor
November 17, 2000
Filed under ,

HUBBLE SPACE TELESCOPE
 
  DAILY REPORT #2752
 
PERIOD COVERED:  0000Z (UTC) 11/16/00 – 0000Z (UTC) 11/17/00
 
Daily Status Report as of 322/0000Z
 
1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:
 
    1.1 Completed STIS/CCD 8580 (Pre-Cassini/Huygens Studies of Titan’s Surface, Troposphere and Stratosphere)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to observe Titan, Saturn’s largest satellite.  Titan has an opaque atmosphere in UV and visible wavelengths due to aerosols and methane gas.  This proposal performs a data-dense suite of observations to {a} map the
three-dimensional distribution of methane and aerosols in Titan’s troposphere and stratosphere with the possibility of detecting moving weather patterns, {b} provide a history of the distribution of haze in preparation for Cassini and Huygens observations, and {c} map Titan’s surface albedo with unprecendented spatial resolution and
signal/noise.  There were no reported problems.
 
    1.2 Completed Four 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.  There were no reported anomalies.
 
    1.3 Completed Two Sets of STIS/CCD 8837 (CCD Dark Monitor-Part 1)
 
        The Space Telescope Imaging Spectrograph (CCD) was used to monitor the darks.  The proposal completed with no reported problems.
 
    1.4 Completed Two Sets of WF/PC-2/STIS/CCD 8641 (Testing the Accelerating Universe)
 
        The WF/PC-2 and the Space Telescope Imaging Spectrograph (CCD) were used to observe Type Ia supernovae which provide evidence for an accelerating universe: an extraordinary result that needs to be rigorously tested.  The observations completed with no reported problems.
 
    1.5 Completed Four Sets of 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.
 
    1.6 Completed WF/PC-2 8829 (Observatory Focus Monitor)
 
        The WF/PC-2 was used to analyze the HST focus which drifts slowly and shows evidence of undergoing slips of a few microns at random times.  The rate of the WFPC2 monitoring program is insufficient to track and/or understand OTA behavior in order to request timely and appropriate secondary mirror corrections.  This 14 orbit program obtains a large amount of high signal to noise focus data, sometimes in two Science Instruments at once, and will be sufficient to more accurately define the HST
focus.  There were no reported problems.
 
    1.7 Completed Two Sets of 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.
 
    1.8 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.
 
    1.9 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 nominall
 
    1.10 Completed STIS/CCD/MA1 8691 (Calibrating the Cosmic Meter Stick: The Distance to the LMC Using Eclipsing Binaries)
 
        The Space Telescope Imaging Spectrograph (CCD and MA1) was used to measure the LMC distance which is crucial for the calibration of the Cosmic Distance Scale.  The observations completed with no reported problems.
 
    1.11 Completed WF/PC-2 8059 (POMS Test Proposal: Targeted Parallel Archive Proposal)
 
        The WF/PC-2 was used to observe the parallel opportunities available in the neighborhood of bright galaxies are treated in a slightly different way from the normal pure parallels.  Local Group galaxies offer the opportunity for a closer look at young stellar
populations.  Narrow-band images in F656N can be used both to identify young stars via their emission lines, and to map the gas distribution in star-forming regions.  The observations completed nominally.
 
    1.12 Completed STIS/CCD/MA1 8662 (A Snapshot Survey of the Hot Interstellar Medium)
 
        The Space Telescope Imaging Spectrograph (CCD And MA1) was used to obtain snapshot STIS echelle observations of key tracers of hot interstellar gas {C IV, N IV, and Si IV} for selected FUSE Team O VI survey targets with known UV fluxes.  By taking advantage of the snapshot observing mode we will efficiently obtain a large number of spectra suitable for the study of the highly ionized hot component of the interstellar medium {ISM}.  Our goals are to explore the physical conditions in and distribution of such gas, as well as to explore the nature of the interfaces between the hot ISM and the other interstellar gas phases.  The observations completed with no reported problems.
 
    1.13 Completed STIS/CCD/MA2 8111 (CS 22892–052: A Rosetta Star for the Age and Early History of the Galaxy)
 
        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to make observations of the "Rosetta" star CS 22892-0.  These observations should provide significant new information about the early history of the galaxy, specifically the nature of the earliest generations of stars and the types of nucleosynthetic processes that occurred in those stars.  The observations were executed as scheduled, and no anomalies were noted.
 
    1.14 Completed Five 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.
 
    1.15 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.
 
    1.16 Completed STIS/CCD/MA2 8569 (A New Survey for Low-Redshift Damped Lyman-Alpha Lines in QSO MgII Systems)
 
        The Space Telescope Imaging Spectrograph (CCD and MA2) was used to support studies which have shown that most of the observable neutral gas mass in the Universe resides in QSO damped LyAlpha {DLA} systems.  However, at low redshift , DLA can only be found by searching in the UV with HST.  By boot-strapping from the MgII statistics, we will be able to further improve the determination of the low- redshift statistical properties of DLA {their incidence and cosmological mass density} and open up new opportunities for studies at low redshift.  The observations completed nominally.
 
2.0 FLIGHT OPERATIONS SUMMARY:
 
    2.1 Guide Star Acquisitions:
      Scheduled Acquisitions: 9
                Successful: 9
 
    Scheduled Re-acquisitions: 7
                Successful: 7
 
    2.2 FHST Updates:
                  Scheduled: 16
                Successful: 16
 
    2.3 Operations Notes:
 
        Using ROP SR-1A, the correctable SSR EDAC errors were cleared three times.
 
        The engineering status buffer limits were adjusted twice per ROP DF-18A.
 
        The Flight Software (FSW) 1.4A installation procedure was successfully performed at 321/1844Z.  Then, at 321/2033Z, the FSW 1.4A EEPROM installation procedure was executed uneventfully.
 
        Quick CCL updates were loaded onto the operational string at 321/1556Z.
 
        A TTR was written for a required command re-transmission at 322/0726Z.
 
        The Flight Operations Team will transfer to GSFC at approximately 322/1100Z in order to allow for more efficiently diagnose problems with the CCS 3.3 software.
 
3.0 SIGNIFICANT FORTHCOMING EVENTS:
 
        Continuation of normal science observations and calibrations.

SpaceRef staff editor.