Observations of C2 Molecules in the Coma of Comets at Mitaka |
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Authors: | Sekiguchi T Watanabe J Fukushima H Yamamoto T Yamamoto N |
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Institution: | (1) European Southern Observatory, Casilla 19001, Santiago, Chile;(2) The Graduate University for Advanced Studies, Osawa, Mitaka, Tokyo 181, Japan;(3) National Astronomical Observatory, Osawa, Mitaka, Tokyo 181, Japan;(4) Department of Earth and Planetary Sciences, Hokkaido University, Sapporo 060, Japan;(5) Department of Physics, Science University of Tokyo, Shinjuku, Tokyo 162, Japan |
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Abstract: | In order to monitor the various phenomena of comets, we continuously made the near-nucleus imaging observations of comets
at National Astronomical Observatory, Mitaka. Here we report on the results of the observations of two spectacular comets.
One is the analysis of photometry of C2 emission images in the coma of comet Hyakutake (C/1996 B2). By comparing the production rates of C2 radicals with C2H2 molecules, we conclude that the most C2 radicals were originated from C2H2, while some of them might be produced from other parents. The second item is the analysis of the morphology of C2 emission images in the coma of comet Hale-Bopp(C/1995 O1). By applying a ring masking technique, we detected asymmetrical
distribution of the C2 molecules. The results of these two comets might suggest that a portion of C2 radicals were formed by the disintegration of the small organic dust grains, like the so-called CHON particles.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | C2 Production rate asymmetrical coma C/1996 B2 C/1995 O1 |
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