Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...64...27r&link_type=abstract
Icarus (ISSN 0019-1035), vol. 64, Oct. 1985, p. 27-36.
Astronomy and Astrophysics
Astronomy
6
Astronomical Spectroscopy, Comets, Continuous Spectra, Interplanetary Dust, Brightness, Grain Size, Mie Scattering, Refractivity, Spectral Reflectance, Comets, Spectra, Comparisons, Optical Properties, Grains, Wavelengths, Color, Refractive Index, Scattering, Smirnova-Chernykh, Crommelin, Flux, Earth-Based Observations, Telescope Methods, Short-Period Comets, Density, Iras 1983K, Iras 1983O, Reflectivity, Comae, Brightness, Dust, Gases, Calculations
Scientific paper
The authors have taken and reduced optical spectra of the four comets IRAS 1983k, P/Smirnova-Chernykh, IRAS 1983ο and P/Crommelin in the wavelength range 3700 - 7300 Å using a single observing system and reduction procedure. The continua all appear reddened with respect to the solar spectrum. The amount of reddening is consistent with a prevalence of ≡2-μm-sized grains in all four comets, if the refractive indices of the grains are approximately equal to those of terrestrial rocks. Significant color differences were measured among the comets. Different intrinsic grain properties are suggested since the scattering geometries were very similar. The amount of reddening does not appear to be correlated with the amount of dust in the coma.
Jewitt David C.
Remillard Ron A.
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