Results 51 to 60 of about 2,447 (234)

Low thermal conductivity boulder with high porosity identified on C-type asteroid (162173) Ryugu [PDF]

, 2019
C-type asteroids are among the most pristine objects in the Solar System, but little is known about their interior structure and surface properties. Telescopic thermal infrared observations have so far been interpreted in terms of a regolith-covered ...
Otto, Katharina, Hamm, Maximilian, Grott, Matthias, Okada, Tatsuaki, Senshu, Hiroki, Delbo, Marco, Biele, Jens, Ogawa, Kazunori, Jaumann, Ralf, Kührt, Ekkehard, Knollenberg, Joerg, Michel, Patrick, Neumann, Wladimir, Knapmeyer, Martin, Hagermann, Axel   +14 more
core   +1 more source

Three-dimensional textures of Ryugu samples and their implications for the evolution of aqueous alteration in the Ryugu parent body

, 2023
This is a dataset for a paper entitled "Three-dimensional textures of Ryugu samples and their implications for the evolution of aqueous alteration in the Ryugu parent body." which is going to submit to Geochimica et Cosmochimica Acta.THIS ...
Tsuchiyama, A (via Mendeley Data)
core   +1 more source

Field Surveys on Cape Ryugu, East Antarctica in 1977-1978

Antarctic Record, 1978
The summer field party of the 19th Japanese Antarctic Research Expedition (JARE-19) camped at Cape Ryugu 220 km east-northeast of Japanese Antarctic Station, Syowa, from December 30th, 1977 to January 14th, 1978. Dr. KAMINUMA of the National Institute of
Katsutada KAMINUMA, Yutaka NAKAI, Takashi KANO, Shin-ichi YOSHIKURA, Toshio KUNIMI, Hiroshi KANDA   +5 more
doaj   +1 more source

Insights into the formation and evolution of extraterrestrial amino acids from the asteroid Ryugu

Nature Communications, 2023
Amino acid concentrations from 2 particles returned from different touchdown sites on the surface of Ryugu are reported. Differences in chemistry suggest different levels of aqueous alteration are recorded at the 2 sampled locations.
Christian Potiszil, Tsutomu Ota, Masahiro Yamanaka, Chie Sakaguchi, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Hiroshi Kitagawa, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Eizo Nakamura   +23 more
doaj   +1 more source

Advanced aqueous alteration in primitive meteorites: Micro‐ to nanoscale studies of CR1 iron sulfides

Meteoritics &Planetary Science, EarlyView.
Abstract This study documents micro‐ to nanoscale observations of primary nebular and secondary parent body iron sulfides in the CR1 GRO 95577. Despite the extensive alteration of the bulk sample, some primary sulfides managed to avoid alteration, having originally formed in the solar nebula during chondrule formation by either fission‐sulfidization or
S. A. Singerling
wiley   +1 more source

Evidence for the Presence of Thin and Heterogenous Dust Deposits on Ryugu's Boulders From Hayabusa2 MARA and Sample Data

Geophysical Research Letters, 2023
Middle infrared spectral results obtained in‐situ by the Hayabusa2 MARA instrument are generally in‐line with previous results and a new comparison with sample C0137 returned from asteroid (162173) Ryugu, being similar to an aqueously altered CI1 ...
M. Hamm, V. E. Hamilton, C. A. Goodrich
doaj   +1 more source

The role of composition in the spectral evolution of carbonaceous asteroids as informed by Bennu sample return

Meteoritics &Planetary Science, EarlyView.
Abstract Near‐Earth rubble‐pile asteroids Bennu and Ryugu are part of the carbonaceous taxonomic complex (C‐complex), and samples returned from both bodies resemble the most aqueously altered carbonaceous chondrites. However, telescopic and spacecraft visible–near infrared (VIS–NIR) reflectance spectra of Ryugu exhibit a red (positive) spectral slope ...
Ralph E. Milliken, Takahiro Hiroi, Victoria E. Hamilton, Cody D. Schultz, Ed A. Cloutis, Hannah H. Kaplan, Melissa K. Kontogiannis, Nathalia Vega‐Santiago, Dani N. DellaGiustina, Harold C. Connolly Jr., Dante S. Lauretta   +10 more
wiley   +1 more source

Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu

, 2023
Preliminary analyses of asteroid Ryugu samples show kinship to aqueously altered CI (Ivuna-type) chondrites, suggesting similar origins. We report identification of C-rich, particularly primitive clasts in Ryugu samples that contain preserved presolar ...
Aléon, J., Yoneda, S., Choi, B., Onose, M., Tanaka, S., Ireland, T., Nguyen, A., Yamashita, K., Okazaki, R., Masuda, Y., Nesvorný, D., Yui, H., Yurimoto, H., Kitajima, K., Komatani, S., Usui, T., Nagashima, K., Kawasaki, N., Terada, K., Qin, L., Watanabe, S., Keller, L., Terui, F., Fukai, R., Kleine, T., Russell, S., Sakamoto, K., McKeegan, K., Alexander, C., Walker, R., Pack, A., Nakazawa, S., Haba, M., Kita, N., Huss, G., Tafla, L., Nishimura, M., Homma, H., Bizzarro, M., Sakamoto, N., Yabuta, H., Wada, S., Saiki, T., Bajo, K., Di Rocco, T., Carlson, R., Bouvier, A., Fujiya, W., Terada, Y., Ishikawa, A., Morita, M., Ichida, K., Davis, A., Amelin, Y., Nakai, I., Iizuka, T., Park, C., Itoh, S., Motomura, K., Yogata, K., Miyazaki, A., Noguchi, T., Hibiya, Y., Nittler, L., Amari, S., Gautam, I., Yoshikawa, M., Dauphas, N., Hidaka, H., Yokoyama, T., Moynier, F., Chaussidon, M., Liu, M., Yada, T., Abe, M., Hoppe, P., Young, E., Nakato, A., Tachibana, S., Schönbächler, M., Wadhwa, M., Mane, P., Piani, L., Krot, A., Tang, H., Yin, Q., Zhang, A., Okada, T., Tsuda, Y., Nakamura, T., Abe, Y., Naraoka, H.   +91 more
core   +2 more sources

Resurfacing processes constrained by crater distribution on Ryugu

, 2022
International audienceUnderstanding the geological modification processes on asteroids is fundamental for elucidating their surface evolution. Images of small asteroids from spacecrafts show a depletion in smaller craters.
Takaki, Naofumi, Sugita, Seiji, Yoshioka, Kazuo, Kameda, Shingo, Sawada, Hirotaka, Hayakawa, Masahiko, Cho, Yuichiro, Kouyama, Toru, Honda, Rie, Tatsumi, Eri, Yamada, Manabu, Yokota, Yasuhiro, Morota, Tomokatsu, Ogawa, Kazunori, Sakatani, Naoya, Honda, Chikatoshi, Michel, Patrick, Suzuki, Hidehiko   +17 more
core   +1 more source

Anhydrous minerals in asteroid Bennu: Evidence for well‐preserved primordial components

Meteoritics &Planetary Science, Volume 61, Issue 6, Page 963-986, June 2026.
Abstract Aqueously altered carbonaceous astromaterials are dominated by secondary minerals, but a minor fraction of primary, anhydrous silicates and oxides escape alteration, offering insight into the original composition of asteroid parent bodies. We report the mineralogy, petrology, mineral chemistry, and oxygen isotopes of anhydrous minerals—50 ...
S. S. Russell, I. A. Franchi, T. Salge, X. Zhao, R. H. Jones, A. J. King, N. V. Almeida, P. F. Schofield, H. C. Bates, E. A. Cortes‐Calderon, N. Kawasaki, Y. Yurimoto, Y. Marrocchi, G. Libourel, K. Thomas‐Keprta, L. P. Keller, K. Righter, T. J. McCoy, T. J. Zega, J. J. Barnes, A. N. Nguyen, S. Tachibana, H. C. Connolly Jr, D. S. Lauretta   +23 more
wiley   +1 more source