カリストの岩,金属,氷の分布
J D Anderson1, G Schubert, R A Jacobson
1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109-8099, USA.
Science (New York, N.Y.)
|June 11, 1998
まとめ
ガリレオ宇宙船のデータは,木星が木星であることを示唆しています.
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
- ジョビアン・システム・スタディズ
背景:
- 前回のガリレオ宇宙船のC3データとの遭遇は,木星の最も外側の月カリストが無差別であったことを示唆した.
- カリストの内部構造は,そのユニークな構成と木星系内の位置により,科学的調査の対象となっている.
研究 の 目的:
- 複数のガリレオ宇宙船との遭遇から得られたラジオドップラーデータを用いて,カリストの内部構造を再評価する.
- カリストの分化状態と内部層の理解を洗練する.
主な方法:
- ガリレオ宇宙船のC3,C9およびC10がカリストと遭遇した際に収集されたラジオドップラーデータの分析.
- 観測データと惑星の微分化のモデルを比較する.
主要な成果:
- C9からの出会いデータは,不分化の可能性の初期発見を裏付けました.
- C10との出会いから得られたより正確なデータは,カリスト内での岩石と氷の部分的,しかし不完全な分離を示している.
- カリストの内部は,岩と金属の核,外側の氷層,そして岩と氷の混合したマントルから成っているかもしれない.
結論:
- カリストは部分的に微分化された内部構造を示し,完全な無差別化に関する以前の仮説に異議を唱える.
- 完全に氷と岩の混合した内部を持つモデルは,ラジオドップラーデータと一致しています.
- カリストの内部構成と差別化の歴史を完全に解明するために,さらなる調査が必要である.
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