地球化学
Online ISSN : 2188-5923
Print ISSN : 0386-4073
ISSN-L : 0386-4073
総説
「はやぶさ2」サンプルリターン探査―太陽系始源天体探査における位置づけ―
橘 省吾澤田 弘崇岡崎 隆司高野 淑識
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ジャーナル オープンアクセス

2014 年 48 巻 4 号 p. 265-278

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抄録

Hayabusa2 is the sample return mission to the near-Earth C-type asteroid (162173) 1999 JU3 (2014–2020). Samples from C-type asteroids, which are abundantly present in the asteroid belt and of which reflectance spectra resemble those of carbonaceous chondrites, may well preserve the information covering the entire history of the Solar System; the epoch prior to the birth of the Sun, planetesimals and planet formation including a behavior of volatiles to terrestrial planets. Moreover, asteroidal surface samples record current surface geological processes and the dynamical evolution of small bodies in the Solar System, which are not recorded in meteoritic samples. The Hayabusa2 spacecraft will launch off in 2014, and arrive at the asteroid 1999 JU3 in mid-2018. Investigations by several remote sensing techniques and sample collections at three different locations will be carried out during its 18-month stay. The spacecraft will return to Earth with asteroidal samples in December 2020. In this article, we describe the outline and cosmochemical rationales of the Hayabusa2 mission with its significance in primitive small body exploration missions.

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© 2014 日本地球化学会
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