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Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
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ケーパーベルトオブジェクト55636の大きさとアルベドは,恒星の隠蔽から得られたものです
J L Elliot1, M J Person, C A Zuluaga
1Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. jle@mit.edu
Nature
|June 19, 2010
まとめ
観測により,カイパーベルトオブジェクト55636は,これまで考えられていたよりも小さく,より反射していることが明らかになりました. これは,太陽系外部の地表の活性再生または地表水氷の長期的な安定性を示唆しています.
科学分野:
- 惑星科学は惑星科学である.
- 太陽系探査 太陽系探査について
- カイパーベルトのオブジェクト
背景:
- 海王星を超えた領域であるカイパーベルトには,惑星と共に形成された多数の小さな天体 (カイパーベルトオブジェクト,KBO) が宿っている.
- KBOの研究は,その小さなサイズと広大な距離のために困難です.
- KBO 55636 (2002 TX300) は,水氷が豊富で非常に反射するメンバーとして知られるハウメア衝突型ファミリーに属しています.
研究 の 目的:
- KBO 55636.6のサイズと反射率を正確に決定するために.
- その物理的性質が,その年齢と表面の組成に及ぼす影響を調査する.
- カイパーベルトのオブジェクトの進化を左右するプロセスを理解する.
主な方法:
- 2009年10月9日,KBO 55636によるマルチコードの恒星隠蔽の観測.
- 隠蔽光の曲線を分析して,幾何学的パラメータを導き出す.
- V光学帯の平均半径と幾何学的アルベドの計算.
主要な成果:
- KBO 55636の平均半径は143 ± 5 kmで,これは,以前に推定されたより小さいことを示しています.
- このオブジェクトは,その親体と同様の高幾何学的アルベドを示しています.
- ダイナミックな年齢は,衝突が少なくとも10億年前に起こったことを示唆しています.
結論:
- KBO 55636は高度に反射する天体で,以前の推定よりも小さい.
- その性質は,現在のモデルに異議を唱え,活発な再表面化または地表水氷の千年の持続を暗示しています.
- この発見は,太陽系外部の揮発性物質の長期的な安定性についての洞察を提供します.
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