An overview of the LIDAR observations of asteroid 25143 Itokawa

被引：14

作者：

Mukai, T. ^{[1
]}

Abe, S. ^{[1
]}

Hirata, N. ^{[5
]}

Nakamura, R. ^{[2
]}

Barnouin-Jha, O. S. ^{[3
]}

Cheng, A. F. ^{[3
]}

Mizuno, T. ^{[4
]}

Hiraoka, K. ^{[1
]}

Honda, T. ^{[1
]}

Demura, H. ^{[5
]}

Gaskell, R. M. ^{[6
]}

Hashimoto, T. ^{[4
]}

Kubota, T. ^{[4
]}

Matsuoka, M. ^{[7
]}

Scheeres, D. J. ^{[8
]}

Yoshikawa, M. ^{[4
]}

机构：

[1] Kobe Univ, Grad Sch Sci & Technol, Kobe, Hyogo 6578501, Japan

[2] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[3] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[4] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Kanagawa 2298510, Japan

[5] Univ Aizu, Dept Comp Software, Fukushima 9658580, Japan

[6] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[7] NEC Aerosp Syst, Kanagawa 2240053, Japan

[8] Univ Michigan, Dept Aerosp Engn, Ann Arbor, MI 48109 USA

来源：

ADVANCES IN SPACE RESEARCH | 2007年 / 40卷 / 02期

关键词：

asteroids; Itokawa; LIDAR; mass; density;

D O I：

10.1016/j.asr.2007.04.075

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

We present an overview of the laser altimeter(LIDAR) results for asteroid 25143 Itokawa. The trace of a 7 x 12-m elliptical beam spot made it possible to determine the local surface topography with an accuracy of a few meters in altitude, from a home position roughly 7 km above the surface. Sequential detection of the altitude of the spacecraft during two orbital spans of descent for sampling allowed determination of the asteroid mass as 3.58 x 10(10) kg +/- 5% and 3.54 x 10(10) kg +/- 6%, which are consistent with the most probable mass estimate of 3.51 x 10(10) kg +/- 3% given by Fujiwara et al. [Fujiwara, A., Kawaguchi, J., Yeomans, D.K. et al., 2006. The rubble-pile asteroid Itokawa as observed by Hayabusa. Science 312, 1330-1334]. Together with the total volume of the asteroid deduced from a shape model (i.e., 1.84 x 10(7) m(3) +/- 3%), this estimate by LIDAR suggests that asteroid Itokawa has a low density of 1.9 g/cm(3) +/- 9% and a high bulk porosity of about 40%. (C) 2007 COSPAR. Published by Elsevier Ltd. All rights reserved.

引用

页码：187 / 192

页数：6

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