The absence of a color-distance trend in comets

Details The absence of a color-distance trend in comets The absence of a color-distance trend in comets

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1723j&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Nov. 1988, p. 1723-1730. NASA-supported research.

Astronomy and Astrophysics

Astronomy

11

Astrometry, Astronomical Photometry, Color, Comets, Distance, Near Infrared Radiation, Thermal Emission

Scientific paper

The authors present new measurements of the near-infrared J-H and H-K colors of comets in the heliocentric distance range 1 ≤ R ≤ 6 AU. The measuremens are used to test the hypothesis that cometary color is a function of heliocentric distance, as has been recently advanced by Hartmann and Cruikshank (1984). The authors find no evidence for a color-distance trend in their sample of 23 comets observed and analyzed according to systematic procedures. Instead, the intrinsic scatter among the J-H, H-K colors of comets at a given R is larger than any systematic variation of color with R, indicating real differences between the grain populations in different comets. The color distributions are unimodal; unlike the asteroids, the comets defy classification into distinct color-definded groups.

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