Infrared spectrophotometry of Comet IRAS-Araki-Alcock (1983d) - A bare nucleus revealed?

Details Infrared spectrophotometry of Comet IRAS-Araki-Alcock (1983d) - A bare nucleus revealed? Infrared spectrophotometry of Comet IRAS-Araki-Alcock (1983d) - A bare nucleus revealed?

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...62...97h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 62, April 1985, p. 97-109. NASA-supported research.

Astronomy and Astrophysics

Astronomy

60

Brightness, Comet Nuclei, Infrared Astronomy, Interplanetary Dust, Iras-Araki-Alcock Comet, Albedo, Comet Heads, Cometary Atmospheres, Ice, Light Scattering, Optical Thickness, Radiant Flux Density, Silicates, Comets, Spectrophotometry, Infrared, Wavelengths, Iras-Araki-Alcock, Nucleus, Spectra, Comae, Observations, Astronomy, Brightness, Radius, Comparisons, Temperature, Dust, Production Rates, Gases, Flux

Scientific paper

Spectra of the central core and surrounding coma of comet IRAS-Araki-Alcock (1983d) were obtained at 8 - 13 μm on 11 May and 2 - 4 μm on 12 May 1983. Spatially resolved measurements at 10 μm with a 4-arcsec beam showed that the central core was more than 100 times brighter than the inner coma only 8 arcsec away; for radially outflowing dust, the brightness ratio would be a factor of 8. The observations of the central core are consistent with direct detection of a nucleus having a radius of approximately 5 km. The temperature of the sunlit hemisphere was >300K. Spectra of the core are featureless, while spectra of the coma suggest weak silicate emission. The spectra show no evidence for icy grains. The dust production rate on 11.4 May was ≡105g/sec, assuming that the gas flux from the dust-producing areas on the nucleus was ≡10-5g/cm2/sec.

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