2014 MU69という小さなカイパーベルトオブジェクトのニューホライズン探査からの初期結果
S A Stern1, H A Weaver2, J R Spencer3
1Southwest Research Institute, Boulder, CO 80302, USA. astern@boulder.swri.edu.
まとめ
ニュー・ホライゾンズ宇宙船は,平らな双葉型コンタクトバイナリを明らかにするカイパーベルトオブジェクト (486958) 2014 MU69を観測した. その原始的な性質は,小石雲の崩壊と合併による形成を示唆しています.
科学分野:
- 惑星科学
- 太陽系探査
- カイパーベルトオブジェクト
背景:
- コイパーベルトは海王星の向こうにある 広大な氷の領域で 太陽系の原始的な天体が住んでいます
- 冷たい古典的なカイパーベルトオブジェクト (KBO) は,太陽系の形成から非常によく保存された残骸です.
- KBOの理解は,初期の太陽系の構成と進化の洞察を提供します.
研究 の 目的:
- KBO (486958) 2014 MU69の近くを通過したニューホライズン号の初期発見を紹介します.
- MU69の物理的性質,表面の特徴,および潜在的な起源を特徴づけること.
- 冷たい古典的なKBOの原始的な性質を調査するために
主な方法:
- ニュー・ホライゾンズ宇宙船による近距離画像とリモートセンシング観測.
- MU69の形状,地質,アルベドを決定する高解像度データの分析.
- 観測された性質と,太陽系の小さな天体の形成モデルを比較する.
主要な成果:
- MU69は直径約30kmの平らな双葉コンタクトバイナリーです.
- オブジェクトは分離された地質単位と顕著なアルベド異質性を示しているが,色や組成の変動は最小限である.
- 衛星,リング,昏睡,または太陽風の相互作用の証拠は検出されなかった.
結論:
- MU69の形状と性質は 低速度で2つの葉が合体したものです
- 結石雲の崩壊と合併の形成シナリオは観測によって支持されています.
- MU69は太陽系初期の蓄積過程の 独特で保存されたサンプルです
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