Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248l.147a&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 248, Sept. 15, 1981, p. L147-L151.
Astronomy and Astrophysics
Astronomy
29
Comet Nuclei, Ice, Infrared Astronomy, Near Infrared Radiation, Absorption Spectra, Infrared Reflection, Infrared Spectra, Infrared Spectrophotometers, Mie Scattering, Solar System, Thermal Emission, Comets, Ice, Photometry, P/Tuttle Comet, Meier (1980Q) Comet, Methane, P/Stephan-Oterma Comet, Bowell (1980B) Comet, Colors, Comparisons, Comae, Thermal Emissions, Spectrum, Reflectivity, Water, Carbon Dioxide, Grains, Ammonia, Comet Nuclei, Absorption, Infrared, Observations, Particles, Spectrophotometry
Scientific paper
JHKL photometry of comets P/Tuttle, Meier 1980q, P/Stephan-Oterma, and Bowell 1980b has yielded J-H and H-K colors, uncontaminated by thermal emission, which are nearly identical for all four comets. The colors are inconsistent with the reflection spectrum from a cloud of icy particles, if the particles are composed primarily of any of the ices (H2O, CO2, CH4, or NH3) commonly assumed to be present in the nuclei of comet. Circular variable filter spectra of comet Stephan-Oterma confirm the absence of any absorption features due to these ices. The reflection spectra of these comets appear most like those of Cand S-type asteroids and the ring of Jupiter. Mie calculations for core-mantle particles suggest that ices could be present as thin mantles on inherently reddish, refractory cores, such as magnetite.
A'Hearn Michael F.
Dwek Eli
Tokunaga Alan T.
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