Mass and local topography measurements of Itokawa by Hayabusa

被引：180
作者：
Abe, Shinsuke [1 ]
Mukai, Tadashi
Hirata, Naru
Barnouin-Jha, Olivier S.
Cheng, Andrew F.
Demura, Hirohide
Gaskell, Robert W.
Hashimoto, Tatsuaki
Hiraoka, Kensuke
Honda, Takayuki
Kubota, Takashi
Matsuoka, Masatoshi
Mizuno, Takahide
Nakamura, Ryosuke
Scheeres, Daniel J.
Yoshikawa, Makoto
机构：
[1] Kobe Univ, Grad Sch Sci & Technol, Nada Ku, Kobe, Hyogo 6578501, Japan
[2] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA
[3] Univ Aizu, Dept Comp Software, Fukushima 9658580, Japan
[4] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[5] JAXA, ISAS, Kanagawa 2298510, Japan
[6] NEC Aerosp Syst Co Ltd, Tokyo 1818551, Japan
[7] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
[8] Univ Michigan, Dept Aerosp Engn, Ann Arbor, MI 48109 USA
来源：
SCIENCE | 2006年 / 312卷 / 5778期
关键词：
D O I：
10.1126/science.1126272
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The ranging instrument aboard the Hayabusa spacecraft measured the surface topography of asteroid 25143 Itokawa and its mass. A typical rough area is similar in roughness to debris located on the interior wall of a large crater on asteroid 433 Eros, which suggests a surface structure on Itokawa similar to crater ejecta on Eros. The mass of Itokawa was estimated as (3.58 +/- 0.18) x 1010 kilograms, implying a bulk density of (1.95 +/- 0.14) grams per cubic centimeter for a volume of ( 1.84 +/- 0.09) x 10(7) cubic meters and a bulk porosity of similar to 40%, which is similar to that of angular sands, when assuming an LL ( low iron chondritic) meteorite composition. Combined with surface observations, these data indicate that Itokawa is the first subkilometer-sized small asteroid showing a rubble-pile body rather than a solid monolithic asteroid.
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页码：1344 / 1347
页数：4
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