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titleGas-to-dust ratio and chemical composition in comet 55P / Tempel-Tuttle
Author(jpn)浜根, 寿彦; 河北, 秀世; 鈴木, 文二; 矢野, 創; 吉田, 道利; 渡部, 潤一
Author(eng)HAMANE, TOSHIHIKO; KAWAKITA, HIDEYO; SUZUKI, BUNJI; YANO, HAJIME; YOSHIDA, MICHITOSHI; WATANABE, JUN-ICHI
Author Affiliation(jpn)県立ぐんま天文台; 県立ぐんま天文台; 埼玉県立三郷工業技術高等学校; 宇宙科学研究所; 国立天文台; 国立天文台
Author Affiliation(eng)Gunma Astronomical Observatory; Gunma Astronomical Observatory; Saitama Pref. Misato Technological High School; The Institute of Space and Astronautical Science; National Astronomical Observatory of Japan; National Astronomical Observatory of Japan
Issue Date2003-03
PublisherInstitute of Space and Astronautical Science
宇宙科学研究所
Publication titleThe Institute of Space and Astronautical Science repot. S.P.
Volume15
Start page17
End page22
Publication date2003-03
Languageeng
AbstractWe carried out spectroscopic observations of comet 55P/Tempel-Tuttle, the parentbody of the Leonid meteor stream, on 1998 January 23 and 24, using a mid-dispersion spectrographin the wavelength ranges 4700-5500Å and 5700-6500Å. We detected species such as C2, NH2 , and[OI] . To characterize the comet, we estimated the gas-production rates of C2 and NH2 relative tothat of H20 and the gas-to-dust ratio based on the Haser model. The dust color was also estimatedby the method of Jewitt & Meech (1986).The gas-production rates were Q(NH2/H20)=0.23%, Q(C2/H20) = O.10%. These values aretypical for the Borrelly class which is characterized by the depletion of C2 molecule relative tothat of the Halley class. Since about 30% of detected comets belong to the Borrelly class, comet55P/Tempel-Tuttele can not be a peculiar comet, at least from spectroscopic point of view.The gas-to-dust ratio was log(Q(H20)/Afp)= 26.7, which means this comet was gas-rich relativeto comet Halley. The dust color was roughly estimated by using continuum windows, andthe dust reddening was 9.69% per 1000Å, which was consistent with other nine comets observedby Jewitt & Meech (1986).It is plausible that comet 55P/Tempel-Tuttle is not an exotic comet at any rate, except thefact that it is the parent body of the Leonid meteor stream.
Document TypeDepartmental Bulletin Paper
JAXA Category宇宙科学研究所
ISSN0288-433X
NCIDAA10455137
SHI-NOSA4636313000
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/328


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