Data Set Overview
    =================
    NASA's International Halley Watch (IHW) has created a Comet
    Halley Archive. The collection of data spans the full
    wavelength range as submitted by scientists to the IHW. The
    observations belong to one of the following Disciplines:
    Amateur, Astrometry, Infrared Studies, Large-Scale
    Phenomena, Meteor Studies, Near-Nucleus Studies, Photometry
    and Polarimetry, Radio Studies, and Spectroscopy and
    Spectrophotometry. The data collected by these nine
    disciplines were augmented by Spacecraft measurements. The
    data were submitted to IHW, but the evaluation and selection
    for the Archive has been the primary responsibility of the
    Discipline Specialist Teams for each network in cooperation
    with the Lead Center. The Spectroscopy and Spectrophotometry
    Network collected 2732 files of data which were classified
    as 'reduced', which means that at least wavelength is
    calibrated and in some cases flux as well. Some data on
    non-Halley targets for the spectroscopic observations can be
    grouped according to 'laboratory' calibration, dark, bias,
    flatfield, sky, and photometric standards. In the first
    category, a large number of 'arcs' and 'lamps' were used as
    follows: HE-NE, TH-AR, NE-AR, CU-AR, CU-NE, Thorium,
    Tungsten, Quartz, and Rubidium. For the 'sky' observers used
    the twilight, moonlight, and blank sky. The most common
    'photometric' standards were stars, but observers also
    included other comets (Hartley-Goode), asteroids (Ceres),
    reflection nebulae (R8), and emission nebulae (NGC1982,
    NGC7000). A list of these stellar calibration targets
    follows: HD 140283, HD 184711, HD89688, HD102870, HD120086,
    HD13974, HD219188, HD 25680, HD 19445, HD18803, HD30455,
    HD26912, SAO 1280, HZ15, CD-22 7696, GD 190, GC5106, GC2188,
    GC2192, G19113213, G 99-37, L745-46A, Feige 15, Feige 56,
    Landolt 98, Landolt 92, Van Beuren, RHO ORION, CHI 1 ORION,
    29 PI LEO. These data consisted of both one and two
    dimensional data covering the date range from 1984 December
    23 through 1988 February 17.
 
 
  Processing Level Id            : 3
  Software Flag                  : N
 
 
  Parameters
  ==========
  Data Set Parameter Name        : COUNT
 
 
    Description
    -----------
      A generic unit for measuring the output of any system with
      quantized outputs. This may correspond to the number of
      detected photoelectrons in a photomultiplier
      tube-amplifier-counter, or it may refer to the output of an
      A-to-D converter at the output of a CCD chip, or it may
      refer to the number of particles counted by a dust-particle
      counter. The value of 'COUNT' may be non-linear in the
      incident quantity which is being measured, although the term
      is more commonly used in cases where it is a linear
      measurement of the incident, measured quantity.
 
 
    Source Instrument Parameters
    ============================
    Instrument Host ID              : SPEC
    Data Set Parameter Name         : COUNT
    Instrument Parameter Name       : N/A
    Important Instrument Parameters : 0
 
 
  Measurement Information
  =======================
 
    Atmospheric Conditions
    ----------------------
      N/A
 
 
    Source
    ------
      N/A
 
 
    Calibration Standard
    --------------------
      N/A
 
 
    Wavelength Calibration
    ----------------------
      N/A
 
 
    Processing
    ==========
    N/A

Overview
    ========
    N/A