講演情報
[U06-P20]探査候補となる地球近傍小惑星の可視分光観測
*黒田 大介1、石黒 正晃2、高遠 徳尚3、長谷川 直4、安部 正真4、津田 雄一4、杉田 精司5、臼井 文彦6、服部 尭3、岩田 生3、今西 昌俊3、寺田 宏3、Choi Young-Jun7、渡邊 誠一郎8、吉川 真4 (1.国立天文台 岡山天体物理観測所、2.ソウル大学物理天文学科、3.国立天文台ハワイ観測所、4.宇宙航空研究開発機構宇宙科学研究所、5.東京大学新領域創成科学研究科、6.東京大学大学院理学系研究科、7.韓国天文宇宙科学研究院、8.名古屋大学大学院環境学研究科)
キーワード：
小惑星、可視分光観測、スペクトル分類
We present a unique data set of the taxonomic type of near-Earth asteroids (NEAs) accessible with available spacecraft.
The research on NEAs has entered a new phase thanks to sample-return space explorations together with state-of-the-art large ground-based telescopes. We made observations of twelve asteroids with Subaru, GEMINI-North, GEMINI-South and Okayama 188cm telescopes. They have low delta-v orbits with potential to be investigated by manned/unmanned spacecraft. Also, ten sub-km-sized bodies are included in them, and are one of remarkable characteristics in terms of an evolutionary scenario.
We find that eleven asteroids are classified as S-complex and one asteroid as V-type. Most S-complex asteroids (eight out of eleven, 〜70%) have spectra similar to subgroups of Q or Sq-type, suggesting that these objects are less matured against space weathering.
In this presentation, we show their spectra and discuss dominance of S-complex asteroids based on the previous research.
The research on NEAs has entered a new phase thanks to sample-return space explorations together with state-of-the-art large ground-based telescopes. We made observations of twelve asteroids with Subaru, GEMINI-North, GEMINI-South and Okayama 188cm telescopes. They have low delta-v orbits with potential to be investigated by manned/unmanned spacecraft. Also, ten sub-km-sized bodies are included in them, and are one of remarkable characteristics in terms of an evolutionary scenario.
We find that eleven asteroids are classified as S-complex and one asteroid as V-type. Most S-complex asteroids (eight out of eleven, 〜70%) have spectra similar to subgroups of Q or Sq-type, suggesting that these objects are less matured against space weathering.
In this presentation, we show their spectra and discuss dominance of S-complex asteroids based on the previous research.