Towards understanding the dynamical evolution of asteroid 25143 Itokawa: constraints from sample analysis

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• 作者：Harold C Connolly Jr ; Dante S Lauretta ; Kevin J Walsh…
• 关键词：Asteroids ; Hayabusa ; Itokawa ; Cosmic ; ray exposure ages ; Chondrites
• 刊名：Earth, Planets and Space
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：67
• 期：1
• 全文大小：597KB
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• 作者单位：Harold C Connolly Jr (1) (2) (3) (4)
  Dante S Lauretta (4)
  Kevin J Walsh (5)
  Shogo Tachibana (6)
  William F Bottke Jr (5)
  
  1. Earth and Environmental Sciences, The Graduate Center of CUNY, 365 5th Ave, New York, New York, 10016, USA
  2. Department Physical Sciences, Kingsborough Community College of CUNY, 2001 Oriental Blvd, Brooklyn, NY, 100235, USA
  3. Department Earth and Planetary Sciences, AMNH, Central Park West, New York, NY, 10024, USA
  4. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, 85721, USA
  5. Southwest Research Institute, 1050 Walnut St, Suite 300, Boulder, CO, 80302, USA
  6. Department of Natural History Sciences, Hokkaido University, N10W8, Sapporo, 060-0810, Japan
  
• 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1880-5981

文摘

The data from the analysis of samples returned by Hayabusa from asteroid 25143 Itokawa are used to constrain the preaccretion history, the geological activity that occurred after accretion, and the dynamical history of the asteroid from the main belt to near-Earth space. We synthesize existing data to pose hypotheses to be tested by dynamical modeling and the analyses of future samples returned by Hayabusa 2 and OSIRIS-REx. Specifically, we argue that the Yarkosky-O’Keefe-Radzievskii-Paddack (YORP) effect may be responsible for producing geologically high-energy environments on Itokawa and other asteroids that process regolith and essentially affect regolith gardening. Keywords Asteroids Hayabusa Itokawa Cosmic-ray exposure ages Chondrites