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イアペタス:カッシーニの画像から得られた独特の表面特性とグローバルな色の二分法
Tilmann Denk1, Gerhard Neukum, Thomas Roatsch
1Institut für Geologische Wissenschaften, Freie Universität Berlin, 12249 Berlin, Germany. Tilmann.Denk@fu-berlin.de
Science (New York, N.Y.)
|December 17, 2009
まとめ
カッシーニ宇宙船の観測により,イアペトスは地球全体で色の二分法があり,主要な半球の材料は赤色であることが明らかになった. これは外来的な起源を示唆し,その独特のアルベドパターンを形成する熱的プロセスを開始しました.
科学分野:
- 惑星科学は惑星科学である.
- アストロジオロジー アストロジオロジー
- 表面プロセス 表面プロセス
背景:
- 土星の衛星イアペトスは,独特のグローバルカラー二分法とアルベドパターンを表しています.
- 以前の観測では,イアペタスの表面の明るさと色に変化が認められた.
研究 の 目的:
- カッシーニイメージングサイエンスサブシステムによるIAPETUSのデータを分析するために.
- イアペトスの全球色とアルベドの二分法の起源を調査するために.
- 衝突クレーターを含むイアペトスの表面の特徴を形作るプロセスを決定する.
主な方法:
- カッシーニ宇宙船のイメージングサイエンスサブシステムを用いて,イアペトゥスを2004年以来何度も撮影した.
- 高解像度画像の分析により,ピクセルあたり ~10メートルまでの衝突クレーターが明らかになりました.
- クレーター壁の向きと半球間の色差の調査.
主要な成果:
- イアペトスの表面に多数の衝突クレーターが観測されました.
- 暗い半球の小さな明るいクレーターは,暗い毛布の厚さ1メートル以下を示唆しています.
- クレーターの壁は,異なる照明と温度効果を示し,水氷の亜鉛化を示しています.
- 全球的な色彩二分法が特定され,先端半球の材料は後端半球の材料よりも赤くなりました.
結論:
- 温度に依存した水氷の亜鉛化は,イアペタスの局所的なアルベドパターンの重要なプロセスです.
- 赤いリードサイドの材料によって特徴づけられるグローバルカラー二分法は,外来的な起源を指しています.
- グローバルカラー二分論は,イアペトゥスのグローバルアルベド二分論に起因する熱的プロセスを開始した可能性が高い.
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