Results 21 to 30 of about 938 (163)
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 morewiley +1 more sourceLow temperatures and high water/rock ratios in asteroid (101955) Bennu's history based on X‐ray powder diffraction of returned samples
Meteoritics &Planetary Science, Volume 61, Issue 6, Page 1077-1094, June 2026.Abstract
Samples returned by NASA's OSIRIS‐REx mission from the carbonaceous asteroid (101955) Bennu hold clues about conditions in the early solar system and the formation of planetary bodies. Initial investigation of Bennu samples found that they are rich in phyllosilicates and other secondary minerals formed during aqueous alteration of a larger ...A. J. King, P. F. Schofield, J. Najorka, H. C. Bates, S. S. Russell, T. J. McCoy, T. J. Zega, H. C. Connolly Jr, D. S. Lauretta +8 morewiley +1 more sourceCI chondrite Oued Chebeika 002 links asteroids Bennu and Ryugu to common parent body
Meteoritics &Planetary Science, Volume 61, Issue 5, Page 801-818, May 2026.Abstract
CI chondrites are a compositionally primitive group of meteorites that have undergone extensive aqueous alteration, providing insights into the evolution of primitive planetesimals. Oued Chebeika 002 is the most pristine CI chondrite to date.Megan Broussard, Katharina Lodders, Paul K. Carpenter, Piers Koefoed, Karen Ziegler, Kunihiko Nishiizumi, Marc W. Caffee, Laurence A. J. Garvie, Ryan C. Ogliore, Anthony J. Irving, Bradley L. Jolliff, Kun Wang +11 morewiley +1 more sourceRyugu reference project: Recommendations from the measurement definition team
Meteoritics &Planetary Science, Volume 61, Issue 5, Page 819-848, May 2026.Abstract
Sample return missions play a significant role in planetary science by providing pristine extraterrestrial materials. JAXA's Hayabusa2 and NASA's OSIRIS‐REx missions have returned samples from the C‐type asteroids Ryugu and Bennu, respectively. The chemical and mineralogical compositions of these samples closely resemble those of CI chondrites,Tetsuya Yokoyama, Guillaume Avice, Henner Busemann, Nicolas Dauphas, Daniel P. Glavin, Ashley J. King, Thorsten Kleine, Katharina Lodders, Frederic Moynier, Maria Schönbächler, Yoshinori Takano, Kun Wang, Hikaru Yabuta, Yuma Enokido, Ryota Fukai, Shogo Tachibana, Tomohiro Usui +16 morewiley +1 more sourceHayabusa2 arrives at the carbonaceous Asteroid 162173 Ryugu - A spinning top-shaped rubble pile [PDF]
, 2019 The Hayabusa2 spacecraft arrived at the near-Earth carbonaceous asteroid 162173 Ryugu in 2018. We present Hayabusa2 observations of Ryugu’s shape, mass, and geomorphology.Matsumoto, K., M. OZAKI, Tanaka, S., T. MOROTA, M. MATSUOKA, A. MOUSSI, G. KOMATSU, Yamada, M., French, A. S.V., R. JAUMANN, H. IKEDA, Y. YOKOTA, Hirabayashi, M., J. -P. BIBRING, N. SAKATANI, Moussi, Aurelie, Cho, Y., Scheeres, D., Y. YAMAMOTO, Yoshikawa, K., Hirose, C., Mimasu, Y., Ho, T.-M., Tatsumi, E., Suzuki, H., Iijima, Y., C. KRAUSE, T. NAKAMURA, A. S. FRENCH, French, A., Jaumann, R, S. HOSODA, H. MIYAMOTO, T. IWATA, T. MICHIKAMI, Yamamoto, Y., Ishiguro, M., E. PALMER, D. J. SCHEERES, Takei, Y., Barnouin, Olivier, Fujii, A., Matsuoka, M., S. WATANABE, H. SUZUKI, N. NAMIKI, Ogawa, K., H. TAKEUCHI, M. HAYAKAWA, R. NOGUCHI, Arakawa, M., H. SENSHU, H. SAWADA, M. FUJIMOTO, Yoshioka, K., K. WADA, Shirai, K., Yoshikawa, M., Palmer, E., Fuse, T., T. KOUYAMA, H. KIKUCHI, K. SHIRAI, Yamaguchi, T., S. SUGITA, O. MORI, Abe, M., C. HIROSE, R. TSUKIZAKI, Hayakawa, M., Hosoda, S., Bibring, J.-P., Shimaki, Y., Yokota, Y., K. YOSHIOKA, Okada, T., Ho, Tra-Mi, Tsuda, Y., Ono, G., Takeuchi, H., Tsukizaki, R., Honda, C., Michikami, T., N. OGAWA, Yoshikawa, Makoto, Abell, P. A., Y. IIJIMA, M. HIRABAYASHI, K. YOSHIKAWA, T. OKADA, Moussi, A., Iwata, T., Hirata, N., Y. MIMASU, T. FUSE, Miyamoto, H., Barnouin, O.S., Kameda, S., H. YABUTA, S. SOLDINI, S. NAKAZAWA, Noguchi, R., F. TERUI, McMahon, J. W., Bibring, J-.P., M. ARAKAWA, E. TATSUMI, Ozaki, M., Kikuchi, H., Komatsu, G., Michel, Patrick, Sugiyama, T., K. KITAZATO, T. SAIKI, Watanabe, S., Senshu, H., Terui, F., Krause, C., Y. CHO, Yano, H., Honda, R., Abell, P., K. MATSUMOTO, T. -M. HO, T. YAMAGUCHI, G. ONO, T. TAKAHASHI, Y. TAKEI, Kitazato, K., Sawada, H., Nakazawa, S., N. NISHIKAWA, R. HEMMI, K. OGAWA, Takahashi, T., Morota, T., A. FUJII, Y. TSUDA, Yabuta, H., N. HIRATA, P. MICHEL, Saiki, T., S. TACHIBANA, S. TANAKA, Jaumann, R., Shimada, T., C. HONDA, Wada, K., Scheeres, D. J., Soldini, S., Wada, Koji, S. KAMEDA, R. HONDA, M. YOSHIKAWA, S. KIKUCHI, M. ABE, O. S. BARNOUIN, Mori, O., P. A. ABELL, Hemmi, R., Gaskell, R., Ogawa, N., H. YANO, Fujimoto, M., J. W. MCMAHON, Ishihara, Y., T. SHIMADA, Kikuchi, S., Tachibana, S., Kouyama, T., Namiki, N., Nishikawa, N., Mcmahon, J., Krause, Christian, M. YAMADA, T. SUGIYAMA, Sakatani, N., Nakamura, T., Sugita, S., Ikeda, H., M. ISHIGURO, Michel, P., Y. ISHIHARA, R. GASKELL, Y. SHIMAKI +184 morecore +1 more sourceHayabusa2's Superior Solar Conjunction Phase Trajectory Design, Guidance and Navigation [PDF]
, 2020 Hayabusa2 is the ongoing JAXA’s sample and return mission to the asteroid Ryugu. In late 2018, Ryugu was in superior solar conjunction with the Earth.Nakazawa, Satoru, Takanao, Saiki, Tsuda, Yuichi, Soldini, Stefania, Yamaguchi, Tomohiro +4 morecore +1 more sourceThe MASCOT lander aboard Hayabusa2: The in-situ exploration of NEA (162173) Ryugu [PDF]
, 2021 After 3.5 years of cruise, and about 3 months in the vicinity of its target, the MASCOT lander was deployed successfully on October 3, 2018 by the Hayabusa2 spacecraft onto the C-type near-Earth asteroid (162173) Ryugu.Pilorget, Cedric, Grundmann, Jan-Thimo, the MASCOT team, the MASCOT team, Auster, Hans-Ulrich, Glaßmeier, K. H., Lorda, Laurence, Cenac-Morthe, Celine, Pilorget, C., Biele, Jens, Hercik, D., Lange, Michael, Tsuda, Yuichi, Schlotterer, Markus, Moussi, Aurelie, Toth, Nortbert, Schröder, Stefan, Hamm, Maximilian, Lange, Caroline, Okada, Tatsuaki, Baturkin, Volodymyr, Moussi-Soffys, A., Fantinati, Cinzia, Reill, Josef, Knollenberg, Joerg, Mimasu, Yuya, Yoshimitsu, Tetsuo, Saiki, Takanao, Ksenik, Eugen, Fantinati, C., Grott, M., Kuechemann, Oliver, Sasaki, Kaname, Knollenberg, Jörg, Ulamec, S., Schmitz, Nicole, Ulamec, Stephan, Cozzoni, Barbara, Ziach, Christan, Jaumann, Ralf, Cordero, Federico, Bibring, Jean-Pierre, Yoshimitsu, T., Otto, Katharina A., Küchemann, Oliver, Otto, Katharina, Dudal, Clement, Wolff, Friederike, Grott, Matthias, Auster, Ulrich, Grimm, Christian, Grundmann, Jan Thimo, Kayal, Kagan, Ziach, Ch., Krause, Christian, Maibaum, Michael, Bibring, J.-P., Termtanasombat, Nawarat, Ho, Tra-Mi, Okada, T., Tsuda, Y., Toth, Norbert, Herčik, David, Hamm, Maximilian (Dr.), Glaßmeier, Karl-Heinz +63 morecore +1 more sourceSmall‐scale elemental abundance variations in Ryugu particles from touchdown 1
Meteoritics &Planetary Science, Volume 61, Issue 4, Page 580-599, April 2026.Abstract
Ryugu materials closely resemble CI chondrites' mineralogical, chemical, and isotopic compositions; yet minor but resolvable differences in certain elemental abundances are evident. In this study, the bulk chemical compositions of eight individual Ryugu particles (1.5–4.3 mg) from the first touchdown site (TD1) were determined using triple ...Karina López García, Tetsuya Yokoyama, Ikshu Gautam, Makiko K. Haba, Tsuyoshi Iizuka, Nao Nakanishi, Ryota Fukai +6 morewiley +1 more sourceInitial study of regolith exposure ages and burial conditions on Ryugu: Cosmogenic nuclides score in two touchdowns
Meteoritics &Planetary Science, Volume 61, Issue 4, Page 565-579, April 2026.Abstract
Surface processes on the asteroid Ryugu have been investigated using cosmic‐ray‐produced radionuclides, 10Be, 26Al, and 36Cl, and stable noble gases, on eight samples returned by the Hayabusa2 spacecraft. The 10Be and 26Al along with 21Ne measurements indicate that the two Chamber A samples A0105 collected during the first touchdown (TD) were ...Kunihiko Nishiizumi, Keisuke Nagao, Marc W. Caffee, Ryuji Okazaki, Jozef Masarik, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hiroshi Naraoka, Hikaru Yabuta, Kanako Sakamoto, Kasumi Yogata, Toru Yada, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda, Masanao Abe, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Hirotaka Sawada, Satoshi Tanaka, Tomohiro Usui, Koji Wada, Hajime Yano, Makoto Yoshikawa, Hayabusa2 Initial Analysis Volatile Team +30 morewiley +1 more sourceAmino acids on witness coupons collected from the ISAS/JAXA curation facility for the assessment and quality control of the Hayabusa2 sampling procedure
, 2018 The Hayabusa2 mission aims to obtain pristine samples from a near-Earth carbonaceous-type (C-type) asteroid, 162173 Ryugu, and return them to Earth. One of the scientific goals of the mission is to understand the origin and evolution of organic materials Haruna Sugahara, Masanao Abe, Yoshinori Takano, Toru Yada, Kazuya Kumagai, Naohiko Ohkouchi, Hayabusa2 project team, Yuzuru Karouji +7 morecore +1 more source
