An infrared color gradient in the inner coma of Comet Halley

Details An infrared color gradient in the inner coma of Comet Halley An infrared color gradient in the inner coma of Comet Halley

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...78...54c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 78, March 1989, p. 54-62. Research supported by NASA and NSF.

Astronomy and Astrophysics

Astronomy

7

Color Infrared Photography, Halley'S Comet, Infrared Astronomy, Abundance, Brightness Distribution, Ice, Infrared Imagery, Particle Size Distribution, Rayleigh Scattering, Comets, Halley, Infrared, Color, Coma, Gradients, Telescope Methods, Earth-Based Observations, Surface, Brightness, Volatiles, Grains, Dust, Maps, Ice, Hypotheses

Scientific paper

A well-defined gradient is noted in the J-H and H-K colors of near-IR images obtained for Comet Halley in November, 1985, within about 8000 km of the nucleus; the bluest colors are at the photocenter, in conjunction with surface brightness profiles that are steeper than those expected. The color gradient and the brightness profiles are both explainable by the present analysis in terms of the presence of volatile, dirty-ice grains in the inner coma. An outburst of Rayleigh-scattering dust particles (unsupported by spacecraft measurements obtained to date) may also account for the observational data.

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