Infrared photometry and spectroscopy of Comet P/Encke 1987

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Astronomical Spectroscopy, Cometary Atmospheres, Encke Comet, Infrared Photometry, Infrared Spectroscopy, Albedo, Coma, Comet Tails, Continuous Spectra, Hydrocarbons, Interplanetary Dust, Comets, Infrared, Photometry, Spectroscopy, Encke, Comae, Composition, Earth-Based Observations, Data, Grains, Size, Comet Tails, Comet Nuclei, Emissions, Density

Scientific paper

New IR observations in the 2.3-18.5 micron range are presented which demonstrate that P/Encke exhibited very little continuum superheat and very weak silicate emission when near perihelion, at a heliocentric distance of 0.37 AU. It is inferred on the basis of this finding that the grains in P/Encke are large; also, no evidence is found for a 3.4-micron feature associable with hydrocarbon emissions. While there is evidence of jet-like coma activity on the P/Encke nucleus near perihelion, the total IR flux at heliocentric distances near 1 AU may be from a bare, rotating nucleus with a radius in the 2.5-6.4 km range.

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