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J/A+AS/146/73      Nuclear magnitudes of Jupiter family comets (Tancredi+, 2000)
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A catalog of observed nuclear magnitudes of Jupiter family comets.
    Tancredi G., Fernandez J.A., Rickman H., Licandro J.
   <Astron. Astrophys. Suppl. Ser. 146, 73 (2000)>
   =2000A&AS..146...73T
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ADC_Keywords: Comets
Keywords: comets: general - catalogs - techniques: photometric

Abstract:
    A catalog of a sample of 105 Jupiter family (JF) comets (defined as
    those with Tisserand constants T>2 and orbital periods P<20yr) is
    presented with our ``best estimates'' of their absolute nuclear
    magnitudes H_N_=V(1,0,0). The catalog includes all the nuclear
    magnitudes reported after 1950 until August 1998 that appear in the
    International Comet Quarterly Archive of Cometary Photometric Data,
    the Minor Planet Center (MPC) data base, IAU Circulars, International
    Comet Quarterly, and a few papers devoted to some particular comets,
    together with our own observations. Photometric data previous to 1990
    have mainly been taken from the Comet Light Curve Catalogue (CLICC)
    compiled by Kamel (1991, The comet light curve catalogue/atlas. I. The
    compiled observations. Uppsala Univ. Reprocentralen HSC). Most
    absolute nuclear magnitudes are found in the range 15-18, with no
    magnitudes fainter than H_N_~19.5.

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table5.dat        60      105   Absolute nuclear magnitudes and radii
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See also:
           VII/91 : IRAS Asteroid and Comet Survey (Veeder+ 1986)
   J/A+AS/120/301 : Comae of six comets (Sanzovo+ 1996)

Byte-by-byte Description of file: table5.dat
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   Bytes Format Units   Label     Explanations
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   1- 30  A30   ---     Name      Name of the comet
  32- 36  F5.3  AU      q         Perihelion distance
  39- 42  F4.2  AU      rmax      Largest heliocentric distance at which a
                                   nuclear magnitude was observed
  44- 45  I2    ---     Npas      Number of perihelion passages during which
                                   the comet was observed
  48- 51  F4.1  mag     HN        Adopted absolute nuclear magnitude (1)
      54  I1    ---   q_HN        [1/4] Quality class (2)
  57- 60  F4.1  km      R         Effective nuclear radius assuming a
                                   geometric albedo pv=0.04.
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Note (1): A nuclear magnitude corresponds to the total flux 
    coming from the solid nucleus of the comet.
Note (2): Quality classes:
       1: These are our best nuclear magnitudes for which we have many
           observations spread along a wide range of heliocentric distances
           and from more than one observer. The uncertainty in the adopted
           nuclear magnitude is less than or about +/-0.3mag.
       2: These are fairly good estimates based on several observations
           spread throughout a wide range of r, or few observations but made
           at very large r. The uncertainty is estimated to be between
           ~+/-0.3 and +/-0.6mag.
       3: These are estimates made at different r with a somewhat larger
           scatter than for the previous class. The uncertainty should be
           between ~+/-0.6 and +/-1mag.
       4: These are poor estimates, either because they rely upon old data,
           or upon very few observations, or because the observations show a
           large scatter. Some of them can only be considered as a lower
           limit to the nuclear magnitude (i.e., the true magnitude of the
           comet nucleus is fainter than the quoted value). The uncertainty
           is generally well above +/1mag.
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History: Copied at http://www.fisica.edu.uy/~gonzalo/catalog/
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(End)                                          Patricia Bauer [CDS]  26-Jul-2000