Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..437w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 2, Jan. 1985, p. 437-440.
Astronomy and Astrophysics
Astronomy
9
Astronomical Spectroscopy, Continuous Spectra, Cosmic Dust, Emission Spectra, Iras-Araki-Alcock Comet, Radio Spectra, Astronomical Models, Comet Nuclei, Grain Boundaries, Radar Echoes, Spectrum Analysis, Comets, Iras-Araki-Alcock, Radio Emissions, Kohoutek, West, Austin, Comparisons, Dust, Grains, Astronomy, Observations, Source, Models, Flux, Particles, Evaporation, Comet Nuclei, Hypotheses, Data
Scientific paper
The author discusses recent radio continuum observations of comet 1983d (IRAS-Araki-Alcock). The available evidence suggests that the size of the source of continuum emission is approximately 100 km. Models invoking emission due to mm-sized grains have difficulty in accounting for the observed flux because such particles either evaporate or are swept out of the beam on a time scale of approximately a day. An alternative is that the emission is due to a large number of roughly meter-sized boulders distributed in a "halo" approximately 100 km in size around the cometary nucleus. These boulders could also contribute to the observed radar echo.
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