惑星防衛のための小惑星への成功的な動力衝突
R Terik Daly1, Carolyn M Ernst2, Olivier S Barnouin2
1Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA. terik.daly@jhuapl.edu.
Nature
|March 1, 2023
まとめ
NASA (アメリカ航空局)
科学分野:
- 惑星科学
- 天体力学
- 宇宙ミッションエンジニアリング
背景:
- 地球近傍小惑星カタログは,潜在的に破壊的な物体について不完全です.
- 小惑星の衝突緩和戦略には,傾斜と破壊が含まれます.
- キネティック・インパクト・テクノロジーは 優先度の高い宇宙ミッションです
研究 の 目的:
- NASAのダブル・アステロイド・リダイレクト・テスト (DART) ミッションの動力的な衝撃について報告する.
- 小惑星ディモルフォスの DART 衝突を復元する
- 惑星防衛のための 運動インパクター技術の有効性を評価する
主な方法:
- DART宇宙船は, (65803) Didymos二重星系の一部である地球近くの小惑星Dimorphosに自律的に衝突した.
- 衝突の再構築には,タイムライン,衝突場所の特徴,そしてディモルフォスのサイズと形が含まれています.
- 地上望遠鏡は,動力衝突による小惑星の傾斜を定量化しました.
主要な成果:
- DART宇宙船はディモルフォスに 衝突した
- 衝突はディディモスの周回軌道に測定可能な変化をもたらしました
- ディモルフォスのDARTインパクトサイトは特徴付けられました.
結論:
- キネティック・インパクター・テクノロジーは 小惑星の傾斜に有効な方法だ
- DARTミッションは 小惑星の脅威に対する地球防衛の 鍵となる能力を示しました
- 小惑星の相互作用と傾斜のさらなる研究が必要である.
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