SPECTRAL CHARACTERISTICS OF HAYABUSA 2 NEAR-EARTH ASTEROID TARGETS 162173 1999 JU3 AND 2001 QC34
SPECTRAL CHARACTERISTICS OF HAYABUSA 2 NEAR-EARTH ASTEROID TARGETS 162173 1999 JU3 AND 2001 QC34
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隼鸟 2 近地小行星目标 162173 1999 JU3 和 2001 QC34 的光谱特征
DOI：
10.1088/0004-6256/135/4/1101
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
F. Vilas
中科院分区：
文献类型：
--
作者：
F. Vilas
C型近地小行星162173 1999 JU3的反射光谱是在UT 2007年7月11日、9月10日和11日获得的。在2007年7月11日的光谱中发现了一个以0.7 μm为中心的吸收特征，与含铁层状硅酸盐的存在有关。2007年9月的光谱显示出中心在0.6 μm附近的浅吸收特征。相比之下，162173 1999 JU3的反射光谱没有吸收特征，这表明小行星的表面覆盖了两个不同地质单元的结合。在主带小行星中，观察到C型小行星表面物质反射光谱中是否存在这些特征的变化。作为计划中的日本使命隼鸟2号的目标，162173 1999 JU3可能代表了早期太阳系物质的含水变化样本。Hayabusa 2的另一个目标，2001 QC 34，首次被光谱观察到。它的反射光谱具有Q级或O级小行星的特征。
Reflectance spectra of C-type near-Earth asteroid 162173 1999 JU3 were acquired on UT 2007 July 11, September 10 and 11. An absorption feature centered near 0.7 μm, and associated with the presence of iron-bearing phyllosilicates, is seen in the 2007 July 11 spectrum. The 2007 September spectrum shows a shallow absorption feature centered near 0.6 μm. In contrast, the reflectance spectrum of 162173 1999 JU3 obtained during its discovery apparition has no absorption feature, suggesting that the asteroid's surface covers the conjunction of two different geological units. The variation in the presence and absence of these features in reflectance spectra of the surface material of C-type asteroids is observed among main-belt asteroids. As the target for the planned Japanese mission Hayabusa 2, 162173 1999 JU3 could represent a sample of aqueously altered early solar system material. An alternative target for Hayabusa 2, 2001 QC34, was observed spectrally for the first time. Its reflectance spectrum has characteristics of a Q-class or O-class asteroid.