ローゼッタ/VIRTISISによって観測された小惑星21 Lutetiaの表面構成と温度

A Coradini¹, F Capaccioni, S Erard

¹Istituto di Fisica dello Spazio Interplanetario, Istituto Nazionale di Astrofisica (INAF), 00133 Rome, Italy.

Science (New York, N.Y.)

|October 29, 2011

まとめ

ローゼッタミッション (Rosetta mission) とは

科学分野:

惑星科学は惑星科学である.
スペクトル顕微鏡検査です.
アステロイド科学アステロイド科学

背景:

小惑星は,初期の太陽系についての洞察を提供します.
小惑星の組成を理解することは,惑星形成理論にとって極めて重要です.

研究の目的:

小惑星21 Lutetiaの表面構成と熱的性質を分析するために.
宇宙の気象と水質の変化の証拠を調査する.

主な方法:

ロゼッタ宇宙船の可視,赤外線,熱画像スペクトロメーター (VIRTIS) を利用しました.
取得した超スペクトル画像,スペクトル反射率マップ,温度マップ.

主要な成果:

0.4-3.5マイクロメートルの間には,シリケートまたは水素化鉱物の吸収特性が検出されなかった.
表面温度は地形と相関し,245 Kに達した.
熱慣性により,月と似た粉状のレゴリットがあることが示唆される.
宇宙気象や水質の変化のスペクトル証拠は見つかりませんでした.

結論:

小惑星21 Lutetiaは,原始的な小惑星であるようです.
小惑星は,コンドリート物質 (エンスタチットまたは炭酸性) で構成されている可能性が高い.
鉄分が少ない鉱物によって支配されており,差異化や水性変化を経験していません.

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