Asteroid Ryugu before the Hayabusa2 encounter

Progress in Earth and Planetary Science

International Regolith Science Group (IRSG) in Hayabusa2 project¹  Myung-Jin Kim²  Jan Thimo Grundmann³  Stefano Mottola⁴  Maximilian Hamm⁴  Ekkehard Kührt⁴  Matthias Grott⁴  Alessandro Maturilli⁴  Stefan E. Schröder⁴  Roy Lichtenheldt⁵  Jens Biele⁶  Axel Hagermann⁷  Akiko M. Nakamura⁸  Kazunori Ogawa⁸  Hideaki Miyamoto⁹  Larry R. Nittler^1,10  Tatsuhiro Michikami^1,11  Ernesto Palomba^1,12  Jürgen Blum^1,13  Bastian Gundlach^1,13  Tatsuaki Okada^1,14  Naoya Sakatani^1,14  Driss Takir^1,15  Carolyn M. Ernst^1,16  Antonella M. Barucci^1,17  Thomas Müller^1,18  Martin Jutzi^1,19  Hiroki Senshu^2,20  Koji Wada^2,20  Lucille Le Corre^2,21  Scott R. Messenger^2,22  Michael E. Zolensky^2,22  Kevin J. Walsh^2,23  Patrick Michel^2,24  Guy Libourel^2,24 

[1] ;Center for Space Situational Awareness, Korea Astronomy and Space Science Institute;DLR German Aerospace Center, Institute of Space Systems, System Engineering and Project Office;DLR Institute of Planetary Research;DLR Institute of System Dynamics and Control;DLR RB-MSC German Aerospace Center;Department of Biological and Environmental Sciences, University of Stirling;Department of Planetology, Graduate School of Science, Kobe University;Department of Systems Innovation, University of Tokyo;Department of Terrestrial Magnetism, Carnegie Institution of Washington;Faculty of Engineering, Kindai University;INAF, Istituto di Astrofisica e Planetologia Spaziali;Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig;Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency;JETS/Astromaterials Research and Exploration Science, NASA Johnson Space Center;Johns Hopkins University Applied Physics Laboratory;Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique (LESIA), Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, Sorbonne Paris Cité, UPMC Université Paris 06, Sorbonne Universités;Max-Planck Institute for Extraterrestrial Physics;Physics Institute, University of Bern;Planetary Exploration Research Center, Chiba Institute of Technology;Planetary Science Institute;Robert M Walker for Space Sciences, Astromaterials Research and Exploration Science, NASA Johnson Space Center;Southwest Research Institute;Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, CS 34229;

关键词: Hayabusa2;    Ryugu;    Asteroids;    Regolith;    Physical properties;   

DOI  :  10.1186/s40645-018-0237-y

来源: DOAJ

【 摘 要 】

Abstract Asteroid (162173) Ryugu is the target object of Hayabusa2, an asteroid exploration and sample return mission led by Japan Aerospace Exploration Agency (JAXA). Ground-based observations indicate that Ryugu is a C-type near-Earth asteroid with a diameter of less than 1 km, but the knowledge of its detailed properties is very limited prior to Hayabusa2 observation. This paper summarizes our best understanding of the physical and dynamical properties of Ryugu based on ground-based remote sensing and theoretical modeling before the Hayabusa2’s arrival at the asteroid. This information is used to construct a design reference model of the asteroid that is used for the formulation of mission operation plans in advance of asteroid arrival. Particular attention is given to the surface properties of Ryugu that are relevant to sample acquisition. This reference model helps readers to appropriately interpret the data that will be directly obtained by Hayabusa2 and promotes scientific studies not only for Ryugu itself and other small bodies but also for the solar system evolution that small bodies shed light on.

【 授权许可】

Unknown