Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1876s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, June 1988, p. 1876-1894.
Astronomy and Astrophysics
Astronomy
25
Astronomical Photography, Charge Coupled Devices, Comet Nuclei, Comet Tails, Infrared Astronomy Satellite, Radio Waves, Halley'S Comet, High Resolution, Morphology, Comets, Comet Nuclei, Iras-Araki-Alcock, Optical Properties, Infrared, Ultraviolet, Radar Methods, Microwave Methods, Comparisons, Calculations, Spectra, Physical Properties, Sublimation, Flux, Source, Origin, Comae, Rotation, Diagrams, Period, Dust, Models, Earth-Based Observations, Spacecraft Observations, Satellite Observations, Parameters, S
Scientific paper
Optical, radar, infrared, UV, and microwave-continuum observations of Comet IRAS-Araki-Alcok were obtained in May 1983, the week of the comet's close approach to earth. The comet has a nucleus dimension and a rotation period which are similar to those of Comet Halley, but a different morphological signature (a persisting sunward fan-shaped coma). Time variations are noted in the projected nucleus cross section. Results suggest significant limb-darkening effects in the relevant domains of radio waves, and that the comet's interior must be extremely cold. It is found that the thermal-infrared fluxes from the inner coma of the comet are dominated by the nucleus.
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