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The nature of asteroid Itokawa revealed by Hayabusa

Published online by Cambridge University Press:  01 August 2006

M. Yoshikawa ,
A. Fujiwara  and
J. Kawaguchi
M. Yoshikawa
Affiliation:
JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan, email: makoto@isas.jaxa.jp
A. Fujiwara
Affiliation:
JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan, email: makoto@isas.jaxa.jp
J. Kawaguchi
Affiliation:
JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan, email: makoto@isas.jaxa.jp
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Abstract

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The spacecraft Hayabusa, which was launched in 2003, arrived at its destination, asteroid (25143) Itokawa in September 2005. The appearance of Itokawa, a small S-type near Earth asteroids, was totally unexpected. The surface is covered with a lot of boulders and there are only a few craters on it. It looks like a contact binary asteroid. The surface composition is quite similar to LL-chondrite. The estimated density is 1.9 ± 0.13 (g/cm3), so the macro-porosity is about 40%. This means that Itokawa is a rubble pile object. In Itokawa, we may see such things that are very close to building blocks of asteroids. In this paper, we review the mission and the first scientific results.

Keywords

space missionsrendezvousasteroid surfaceasteroid landingsample returninstrumentationmass determination
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S236: Near Earth Objects, our Celestial Neighbors: Opportunity and Risk , August 2006 , pp. 401 - 416
Copyright
Copyright © International Astronomical Union 2007

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