Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...52..377h&link_type=abstract
Icarus, vol. 52, Dec. 1982, p. 377-408.
Astronomy and Astrophysics
Astronomy
99
Asteroids, Astronomical Photometry, Colorimetry, Comets, Planetary Surfaces, Solar System, Comet Nuclei, Diagrams, Infrared Astronomy, Natural Satellites, Spectral Reflectance, Spectrophotometry
Scientific paper
VJHK colors for a number of asteroids and eight comets at various solar distances and levels of activity were obtained, and the observations are interpreted in terms of a two-component mixing model in which outer solar system interplanetary bodies are viewed as mixtures of ice and dark carbonaceous-type (RD and C) dirt. It is inferred that the observed comets have comae, and perhaps surfaces, of dirty ice or ice dirt grains colored by an RD-dirt component. This inference is supported by systematics of an 'alpha index' based on VJHK colors and empirically correlated with albedo and ice/dirt ratio. Among comets the alpha index correlates with solar distance in a way that suggests comets emit dirty ice grains which are stable at large solar distance but from which the ice component sublimes and leaves dirt grains at small solar distance.
Cruikshank Dale P.
Degewij Johan
Hartmann William K.
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