Yuichi Iijima

Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu

Hiroshi Naraoka, Yoshinori Takano, Jason P. Dworkin, Yasuhiro Oba et autres

The Hayabusa2 spacecraft collected samples from the surface of the carbonaceous near-Earth asteroid (162173) Ryugu and brought them to Earth. The samples were expected to contain organic molecules, which record processes that occurred in the early Solar System. We analyzed organic molecules …

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Macromolecular organic matter in samples of the asteroid (162173) Ryugu

Hikaru Yabuta, George D. Cody, C. Engrand, Yoko Kebukawa et autres

Samples of the carbonaceous asteroid (162173) Ryugu were collected and brought to Earth by the Hayabusa2 spacecraft. We investigated the macromolecular organic matter in Ryugu samples and found that it contains aromatic and aliphatic carbon, ketone, and carboxyl functional groups. The spectroscopic …

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A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

T. Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami et autres

Abstract Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the …

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First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu

Ryuji Okazaki, Yayoi N. Miura, Yoshinori Takano, Hirotaka Sawada et autres

The Hayabusa2 spacecraft returned to Earth from the asteroid 162173 Ryugu on 6 December 2020. One day after the recovery, the gas species retained in the sample container were extracted and measured on-site and stored in gas collection bottles. The container gas …

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Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution

Ryuji Okazaki, Bernard Marty, H. Busemann, K. Hashizume et autres

The near-Earth carbonaceous asteroid (162173) Ryugu is expected to contain volatile chemical species that could provide information on the origin of Earth's volatiles. Samples of Ryugu were retrieved by the Hayabusa2 spacecraft. We measured noble gas and nitrogen isotopes in Ryugu samples …

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A pristine record of outer Solar System materials from asteroid Ryugu’s returned sample

Motoo Ito, Naotaka Tomioka, Masayuki Uesugi, Akira Yamaguchi et autres

Abstract Volatile and organic-rich C-type asteroids may have been one of the main sources of Earth’s water. Our best insight into their chemistry is currently provided by carbonaceous chondritic meteorites, but the meteorite record is biased: only the strongest types survive atmospheric …

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Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites

Tetsuya Yokoyama, K. Nagashima, Izumi Nakai, Edward Young et autres

Carbonaceous meteorites are thought to be fragments of C-type (carbonaceous) asteroids. Samples of the C-type asteroid (162173) Ryugu were retrieved by the Hayabusa2 spacecraft. We measured the mineralogy and bulk chemical and isotopic compositions of Ryugu samples. The samples are mainly composed …

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On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective

Eizo Nakamura, K. Kobayashi, Ryoji Tanaka, T. Kunihiro et autres

Presented here are the observations and interpretations from a comprehensive analysis of 16 representative particles returned from the C-type asteroid Ryugu by the Hayabusa2 mission.On average Ryugu particles consist of 50% phyllosilicate matrix, 41% porosity and 9% minor phases, including organic matter.The …

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Hayabusa2 returned samples: A unique and pristine record of outer Solar System materials from asteroid Ryugu

Motoo Ito, Naotaka Tomioka, Masayuki Uesugi, Akira Yamaguchi et autres

Abstract C-type asteroids likely formed in the outer Solar System and were then scattered inwards during giant planet migration (Walsh et al., 2011). They may have transported volatiles to the inner Solar System and created the conditions suitable for life on Earth(Alexander, …

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High-resolution observations of bright boulders on asteroid Ryugu: 2. Spectral properties

Chiho Sugimoto, Eri Tatsumi, Yuichiro Cho, Tomokatsu Morota et autres

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High-resolution observations of bright boulders on asteroid Ryugu: 1. Size frequency distribution and morphology

Chiho Sugimoto, Eri Tatsumi, Yuichiro Cho, Tomokatsu Morota et autres

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Thermophysical properties of the surface of asteroid 162173 Ryugu: Infrared observations and thermal inertia mapping

Yuri Shimaki, Hiroki Senshu, Naoya Sakatani, Tatsuaki Okada et autres

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