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Chapitre D'ouvrage Année : 2023

Ryugu Asteroid

Résumé

(162173) Ryugu is a near-Earth C-type (i.e., carbonaceous) asteroid. It has been, after Itokawa, the second target for an asteroidal sample return, thanks to the JAXA Hayabusa2 mission (Watanabe et al. 2019). Most interestingly, Ryugu in situ observations in 2018–2019 have confirmed, as expected from its classification, the presence of significant amounts of organic molecules, together with hydrated minerals. Ryugu is a roundish, diamond-shaped body with an equatorial bulge. Such a shape, as previously observed during the Rosetta mission for asteroid (2867) Steins, may result from the re-accumulation of rubbles ejected by the catastrophic disruption of a larger aqueously altered parent body (Kitazako et al. 2019; Sugita et al. 2019). With a size and a mass, respectively, about 865 m and 4.5 × 1011 kg, its density is low (≈ 1200 kg m−3), as expected for a rubble-pile asteroid, while its rotation period is of 7.63 h
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Dates et versions

insu-04371590 , version 1 (03-01-2024)

Identifiants

Citer

Anny Chantal Levasseur-Regourd. Ryugu Asteroid. Muriel Gargaud, William M. Irvine, Ricardo Amils, Philippe Claeys, Henderson James Cleaves, Maryvonne Gerin, Daniel Rouan, Tilman Spohn, Stéphane Tirard, Michel Viso (eds). Encyclopedia of Astrobiology, Springer Berlin Heidelberg, pp.2704-2705, 2023, Print ISBN: 978-3-662-65092-9 / Online ISBN: 978-3-662-65093-6. ⟨10.1007/978-3-662-65093-6_5563⟩. ⟨insu-04371590⟩
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