Mutsumi Komatsu

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The asteroid impact near the Russian city of Chelyabinsk on 15 February 2013 was the largest airburst on Earth since the 1908 Tunguska event, causing a natural disaster in an area with a population exceeding one million. Because it occurred in an era with modern consumer electronics, field sensors, and laboratory techniques, unprecedented measurements were(More)
CARBONACEOUS CHONDRITES. T. Mikouchi, M. Zolensky, O. Tachikawa, M. Komatsu, M. A. Ivanova, L. Le and M. Gounelle, Dept. of Earth and Planetary Science, University of Tokyo, Hongo, Tokyo 113-0033, Japan (E-mail:, Mail Code KT, NASA Johnson Space Center, Houston, TX 77058, USA, Vernadsky Inst. of Geochemistry and Analytical(More)
Alteration and Shock Metamorphism. M. Komatsu, T. J. Fagan, A. Yamaguchi, T. Mikouchi, M. Yasutake, and M. E. Zolensky SOKENDAI, The Graduate University for Advanced Studies, Kanagawa, Japan (, Dept. Earth Sciences, Waseda University, Japan, National Institute of Polar Research (NIPR), Japan, Dept. Earth and Planetary Science,(More)
Mikouchi, K. Hagiya, K. Ohsumi, M. Komatsu, P. Jenniskens, L. Le, Q.-Z. Yin, Y. Kebukawa, M. Fries. ARES, Johnson Space Center, Houston, TX USA (, Univ. Tokyo, Tokyo, Japan, Univ. Hyogo, Hyogo, Japan, JASRI, Hyogo, Japan, Waseda Univ., Tokyo, Japan, NASA ARC, Moffett Field, CA USA, Univ. California Davis, Davis, CA USA,(More)
Fagan, M. Miyamoto, A.N. Krot and T. Mikouchi, The University Museum, University of Tokyo, 7-3-1 Hongo Bunkyo-ku Tokyo, Japan (, Department of Earth Sciences, School of Education, Waseda University, 1-6-1 Nishiwaseda Shinjuku-ku Tokyo, Japan, Department of Earth & Planetary Science, University of Tokyo, Japan. Hawaii Institute of(More)
We conducted ground-based performance evaluation tests of the Near-Infrared Spectrometer (NIRS3) onboard Hayabusa2 spacecraft in November 2013 and from April to May 2014 and established a method for evaluating its measured reflectance spectra. Reflectance spectra of nine powdered carbonaceous chondrite samples were measured by both NIRS3 and a Fourier(More)
Introduction: Amoeboid Olivine Aggregates (AOAs) are irregularly-shaped, 100 µm to 5 mm in size, fine-grained objects that constitute a few vol% of meteorites in most carbonaceous chondrite groups. Previous studies concluded that AOAs are aggregates of solar nebula condensates which continued to react with the solar nebula vapor to the temperature to form(More)
CHONDRITE. Michael Zolensky, Takashi Mikouchi, Kenji Hagiya, Kazumasa Ohsumi, Mutsumi Komatsu, Queenie H. S. Chan, Loan Le, David Kring, Michael Cato, Amy L. Fagan, Juliane Gross, Ayuna Tanaka, Daichi Takegawa, Takuya Hoshikawa, Tomoaki Yoshida, Naoya Sawa. ARES, NASA Johnson Space Center Houston, TX 77058, USA (; Univ. of Tokyo,(More)
We studied seven Itokawa particles provided by the Japan Aerospace Exploration Agency (JAXA) as first International Announcement of Opportunity (AO) study mainly using electron and synchrotron radiation X-ray beam techniques. All the analyzed particles were collected from the first-touchdown site and composed of olivine and plagioclase with traces of Ca(More)
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