Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...80..280g&link_type=abstract
Icarus (ISSN 0019-1035), vol. 80, Aug. 1989, p. 280-288.
Astronomy and Astrophysics
Astronomy
17
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.
Gehrz Robert D.
Ney Peter E.
Piscitelli J.
Rosenthal Eran
Tokunaga Alan T.
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