Results 71 to 80 of about 458 (173)

Surface Ages for the Sample Return Asteroids Bennu, Ryugu, and Itokawa

The Planetary Science Journal
The OSIRIS-REx, Hayabusa2, and Hayabusa missions have returned samples from three near-Earth asteroids (NEAs), namely Bennu, Ryugu, and Itokawa, respectively.
William F. Bottke, Alex J. Meyer, David Vokrouhlický, David Nesvorný, Edward B. Bierhaus, Daniella N. DellaGiustina, Rachael Hoover, Harold C. Connolly, Dante S. Lauretta   +8 more
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Three-dimensional textures of Ryugu samples and their implications for the evolution of aqueous alteration in the Ryugu parent body

Geochimica et Cosmochimica Acta
Samples collected from the surface/subsurface of C-type asteroid 162173 Ryugu by the Hayabusa2 mission were nondestructively analyzed in three dimensions (3D). Seventy-three small particles (approximately 10–180 µm in size) were observed using X-ray nanotomography, with an effective spatial resolution of approximately 200 nm.
Akira Tsuchiyama, Megumi Matsumoto, Junya Matsuno, Masahiro Yasutake, Tomoki Nakamura, Takaaki Noguchi, Akira Miyake, Kentaro Uesugi, Akihisa Takeuchi, Shota Okumura, Yuri Fujioka, Mingqi Sun, Aki Takigawa, Toru Matsumoto, Satomi Enju, Itaru Mitsukawa, Yuma Enokido, Tatsuhiko Kawamoto, Takeshi Mikouchi, Tatsuhiro Michikami, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Stefano Rubino, Zelia Dionnet, Alice Aléon-Toppani, Rosario Brunetto, Michael E. Zolensky, Tsukasa Nakano, Naoto Nakano, Hisayoshi Yurimoto, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Fuyuto Terui, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda   +51 more
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A Target Before Shooting Ryugu

Eos, 2019
The asteroid’s rough surface surprised Hayabusa2’s mission scientists. So they pulled out their spare gun and shot an “asteroid” at home first.
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Ryugu - 5/2019

, 2019
Hayabusa 2 sur ...
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2D and 3D EELS Analyses on the Low-Energy Core-Loss Edges in Beam-sensitive Ryugu Asteroid Samples [PDF]

BIO Web of Conferences
Pelaez-Fernandez Mario, Marinova Maya, Teurtrie Adrien, Hettler Simon, Laforet Sylvain, Le Guillou Corentin, Leroux Hugues, Arenal Raul, De la Peña Francisco   +8 more
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Surface Modifications of a Space-weathered Ryugu Sample and the Reflectance Spectral Response

The Planetary Science Journal
Reflectance spectra from the surface of asteroid Ryugu, measured by the Hayabusa2 spacecraft, exhibit a metal-OH absorption at ∼2.7 μ m that is approximately half as deep as the returned samples measured in the laboratory and shifted toward longer ...
Hotaka Onuma, Megumi Matsumoto, Tomoki Nakamura, Kana Amano, Taiga Takase, Kazuhiko Ninomiya, Hideko Nomura   +6 more
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Constraining the Effects of Pre- and Post-accretionary Processes on Ryugu Insoluble Organic Matter

The Astrophysical Journal
Asteroidal and cometary fragments have been indicated as possible sources of the building blocks of life for the early Earth. Samples returned from the asteroid Ryugu are uncontaminated and contain organic matter.
Christian Potiszil, Masahiro Yamanaka, Tsutomu Ota, Chie Sakaguchi, Hiroshi Kitagawa, Ryoji Tanaka, Tak Kunihiro, Katsura Kobayashi, Eizo Nakamura   +8 more
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Evidence for Magnetically‐Driven Accretion in the Distal Solar System

AGU Advances
Paleomagnetic measurements of meteorites indicate that magnetic fields existed in the inner solar nebula capable of driving accretion at rates similar to those observed for young stellar objects with protoplanetary disks.
Elias N. Mansbach, Benjamin P. Weiss, Eduardo A. Lima, Michael Sowell, Joseph L. Kirschvink, Roger R. Fu, Saverio Cambioni, Xue‐Ning Bai, Jodie B. Ream, Chisato Anai, Atsuko Kobayashi, Hironori Hidaka   +11 more
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Pyrrhotite-driven early-stage terrestrial alteration in Ryugu grains

Nature Communications
Samples returned from the carbonaceous asteroid Ryugu preserve a rare record of water- and organic-rich materials from the early Solar System, but this record can be modified rapidly after arrival on Earth.
Masaaki Miyahara, Takaaki Noguchi, Toru Matsumoto, Naotaka Tomioka, Tohru Araki, Akira Miyake, Yohei Igami, Yusuke Seto, Akira Yamaguchi   +8 more
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Bennu and Ryugu: diamonds in the sky

Bennu and Ryugu: diamonds in the sky
Rapidly spinning and loosely aggregated asteroids appear to take on diamond-shaped profiles, with elevated poles as well as equators. The evolutionary processes that form these characteristic shapes remain a matter of debate. In this paper, we propose a novel model, based on debris accretion, to explain these diamond-shaped profiles.
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