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彗星67P/チュリュモフ・ゲラシメンコの表面の変化は,より活発な過去を示唆する
M Ramy El-Maarry1,2, O Groussin3, N Thomas4
1Physikalisches Institut, Universität Bern, 3012 Bern, Switzerland. mohamed.el-maarry@lasp.colorado.edu.
まとめ
ローゼッタ宇宙船のデータは,太陽への曝露による彗星67P / Churyumov-Gerasimenkoの局所的な変化を明らかにしています. これらの小さな表面の変化は,彗星の歴史の初期に形成された主要な地形を示唆しています.
科学分野:
- 彗星科学
- 惑星地質学
- 宇宙探査
背景:
- ローゼッタミッションは,彗星67P/チュリュモフ・ゲラシメンコを約2年間周回した.
- 観測は表面の特徴とサブメータースケールのモニタリングに焦点を当てた.
研究 の 目的:
- 2014年12月から2016年6月に観測された彗星67P/チュリュモフ・ゲラシメンコの局所的な表面変化を分析する.
- 彗星の景観の進化に及ぼす影響を理解する
主な方法:
- ローゼッタ宇宙船による地表観測.
- 高解像度画像とデータを分析し,表面の変化を定量化する.
- 観測された変化を彗星の気象,侵食,そして一時的な太陽系によるイベントに割り当てる.
主要な成果:
- 彗星67P/チュリュモフ・ゲラシメンコの表面に多くの局所的な変化が観測された.
- これらの変化は,彗星の気象,侵食,そして太陽への曝露によって引き起こされる一時的な出来事に起因しています.
- 局所的な変化にもかかわらず,変化の全体的な規模は,彗星の主要な地形を実質的に変更していません.
結論:
- 最近の変化の限られた規模は,彗星67P / Churyumov-Gerasimenkoの主要な地形が現在の軌道構成の初期に確立されたことを示唆しています.
- これらの地形の形成は現在の軌道より前のもので,COやCO2の氷や無形氷のような大量の揮発性物質と関連している可能性があります.
- 構成的または物理的な異質性は局所的な変化によって示唆されるが,景観の進化は主に古代である.
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