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- W2134457958 abstract "We have observed both Comets Hyakutake and Hale-Bopp close to perigee with several telescopes at frequen- cies between 30 and 860 GHz for an extended period of time. The observed light curves can be described as a simple func- tion of heliocentric and geocentric distances without any out- burst or noticeable variability with time. Our most sensitive diameter estimate for C/Hyakutake re- sulted in an upper limit of 2.1 km. The nuclear diameter of C/Hale-Bopp was determined to 44.2 km after separation from the halo emission. The central part of both halos can be represented by a Gaus- sian with a linear size at half power points of 1870 and 11080 km for Hyakutake and Hale-Bopp, respectively. The spectral index for both comets is = 2.8, indicating a similar particle size distributions in the halo of these comets. For Hale-Bopp the extended emission could be traced to more than 10 5 km from its nucleus. The derived masses, contained in the halo depend strongly on the assumed physical properties of the halo particles. With (1mm) = 75 cm 2 /g, possibly more appropriate for comets, a halo mass of 61 0 10 g is derived for Hyakutake and of 81 0 12 g" @default.
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- W2134457958 date "1999-12-01" @default.
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- W2134457958 title "Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz" @default.
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