J/A+AS/146/73 Nuclear magnitudes of Jupiter family comets (Tancredi+, 2000)
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
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 HN=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 HN∼19.5. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 60 105 Absolute nuclear magnitudes and radii
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
Bytes Format Units Label Explanations
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.
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.
History: Copied at http://www.fisica.edu.uy/~gonzalo/catalog/
(End) Patricia Bauer [CDS] 26-Jul-2000
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