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Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Takagi, Yasuhiko*; Nakamura, Tomoki*; Hiroi, Takahiro*; Matsuoka, Moe*; et al.
Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03
Times Cited Count：43 Percentile：96.93(Astronomy & Astrophysics)Here we report observations of Ryugu's subsurface material by the Near-Infrared Spectrometer (NIRS3) on the Hayabusa2 spacecraft. Reflectance spectra of excavated material exhibit a hydroxyl (OH) absorption feature that is slightly stronger and peak-shifted compared with that observed for the surface, indicating that space weathering and/or radiative heating have caused subtle spectral changes in the uppermost surface. However, the strength and shape of the OH feature still suggests that the subsurface material experienced heating above 300 
C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 C at the estimated excavation depth of 1 m, even if the semimajor axis is reduced to 0.344 au. This supports the hypothesis that primary thermal alteration occurred due to radiogenic and/or impact heating on Ryugu's parent body.
Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Arai, Takehiko*; Nakauchi, Yusuke*; Nakamura, Tomoki*; Matsuoka, Moe*; et al.
Science, 364(6437), p.272 - 275, 2019/04
Times Cited Count：259 Percentile：99.73(Multidisciplinary Sciences)The near-Earth asteroid 162173 Ryugu, the target of Hayabusa2 sample return mission, is believed to be a primitive carbonaceous object. The Near Infrared Spectrometer (NIRS3) on Hayabusa2 acquired reflectance spectra of Ryugu's surface to provide direct measurements of the surface composition and geological context for the returned samples. A weak, narrow absorption feature centered at 2.72 micron was detected across the entire observed surface, indicating that hydroxyl (OH)-bearing minerals are ubiquitous there. The intensity of the OH feature and low albedo are similar to thermally- and/or shock-metamorphosed carbonaceous chondrite meteorites. There are few variations in the OH-band position, consistent with Ryugu being a compositionally homogeneous rubble-pile object generated from impact fragments of an undifferentiated aqueously altered parent body.
Nakashima, Yosuke*; Takeda, Hisahito*; Ichimura, Kazuya*; Hosoi, Katsuhiro*; Oki, Kensuke*; Sakamoto, Mizuki*; Hirata, Mafumi*; Ichimura, Makoto*; Ikezoe, Ryuya*; Imai, Tsuyoshi*; et al.
Journal of Nuclear Materials, 463, p.537 - 540, 2015/08
Times Cited Count：19 Percentile：82.55(Materials Science, Multidisciplinary)Nakashima, Yosuke*; Sakamoto, Mizuki*; Yoshikawa, Masayuki*; Oki, Kensuke*; Takeda, Hisahito*; Ichimura, Kazuya*; Hosoi, Katsuhiro*; Hirata, Mafumi*; Ichimura, Makoto*; Ikezoe, Ryuya*; et al.
Proceedings of 25th IAEA Fusion Energy Conference (FEC 2014) (CD-ROM), 8 Pages, 2014/10
Jo, Akinori*; Matsuura, Hirotaka*; Ishizaki, Junro*; Seko, Noriaki; Ueki, Yuji
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 54, 2012/01
no abstracts in English
Shibata, Yoshikazu*; Matsuura, Hirotaka*; Ihara, Toshihiro*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
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Morioka, Yusuke*; Matsuura, Hirotaka*; Ihara, Toshihiro*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
Ikegami, Aya*; Matsuura, Hirotaka*; Ihara, Toshihiro*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
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no abstracts in English
Go, Yasuhiro*; Matsuura, Hirotaka*; Jo, Akinori*; Tamada, Masao; Katakai, Akio
no journal, ,
Chloromethyl styrene was grafted on polyolefin fibers. The obtained fibers were reacted with dimethylaminoethanol in ethanol. The resulting anion exchange fiber has 2.3 mmol/g of anion exchange capacity. After treatment with chlorine ion, the anion exchange fiber could adsorb the nitrate ion of 1.3 mmol/g-adsorbent at space velocity of 2000 h
. This result implies that this anion exchange fiber can adsorb the nitrate ion rapidly.
Inoue, Shinichi*; Matsuura, Hirotaka*; Jo, Akinori*; Tamada, Masao; Katakai, Akio
no journal, ,
Imparting of phosphonic acid and sulfonic acid into fiber grafted with chloromethyl styrene was investigated by selecting chemical agent for sulfonation and reaction order of functions. The chemical agent and the reaction order were optimized to decrease the damage in the mechanical strength of fibers.
Jo, Akinori*; Matsuura, Hirotaka*; Ikegami, Aya*; Tamada, Masao; Katakai, Akio
no journal, ,
Bifunctional chelate fiber having sulfonic acid can improve the metal adsorption in acid solution. The chemical addition of sulfonic acid into the chelate fiber leads the session of fiber adsorbent. The possibility of sulfonic acid grafting was investigated to improve the adsorption characteristic of iminodiacetic acid adsorbent.
Inoue, Shinichi*; Matsuura, Hirotaka*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
Jo, Akinori*; Matsuura, Hirotaka*; Ikegami, Aya*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
Matsuura, Hirotaka*; Morioka, Yusuke*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
Go, Yasuhiro*; Matsuura, Hirotaka*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
Matsuura, Hirotaka*; Tanioka, Kanae*; Kakazu, Kotaro*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
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Otsu, Takeshi*; Matsuura, Hirotaka*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
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no abstracts in English
Fujii, Yuki*; Matsuura, Hirotaka*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
Matsuura, Hirotaka*; Fujii, Yuki*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
Jo, Akinori*; Kato, Shota*; Matsuura, Hirotaka*; Nagata, Kazumi*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
