Solar-Radiation Heating Effects on 3200 Phaethon

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27863

Title:	Solar-Radiation Heating Effects on 3200 Phaethon
Authors:	Ohtsuka,K;Nakato,A;Nakamura,T;Kinoshita,D;Ito,T;Yoshikawa,M;Hasegawa,S
Contributors:	天文研究所
Keywords:	NEAR-EARTH ASTEROIDS;CARBONACEOUS CHONDRITES;THERMAL METAMORPHISM;SPECTRAL PROPERTIES;HYDROUS ASTEROIDS;EXTINCT COMET;METEOR-SHOWER;2005 UD;OBJECTS;MODEL
Date:	2009
Issue Date:	2010-06-29 19:35:04 (UTC+8)
Publisher:	中央大學
Abstract:	Apollo-type near-Earth asteroid 3200 Phaethon, having a small perihelion distance of q similar to 0. 14 AU, is classified as F- or B-type, one of subclasses among the C-complex (C-, G-, B-, and F-types) asteroids. The F/B-type asteroids and dehydrated CI and CM carbonaceous chondrites, which are regarded as being linked to each other, underwent a thermal history of high-temperature heatings at more than hundreds of degrees and dehydration for a certain period of time after aqueous alteration in their parent bodies. However, their primary heating mechanism and its timing are less certain and still controversial. We have investigated solar-radiation heating effects on Phaethon at the present planetary-epoch. As a consequence, we have found that the effects on Phaethon, if it is still hydrated, might indeed be a likely candidate for the primary metamorphic heat source. We also found that solar-radiation heating on Phaethon is a function of the latitude, since Phaethon has a highly tilted polar axis. Thus, the northern hemisphere would be selectively more heated than the southern hemisphere. Therefore, we hypothesized that the northern hemisphere, especially the north pole-northern midlatitude region, would be more thermally metamorphosed and dehydrated, if solar-radiation heating is the primary metamorphic heat source of Phaethon. This may provide the latitude-dependent color variations on Phaethon's surface, although this has not been proven by the existing Phaethon's spectral data.
Relation:	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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