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3. Heliocentric Distance Dependence of Zodiacal Light Observed by Hayabusa2#

Author

Tsumura, Kohji, Matsuura, Shuji, Sano, Kei, Iwata, Takahiro, Yano, Hajime, Kitazato, Kohei, Takimoto, Kohji, Yamada, Manabu, Morota, Tomokatsu, Kouyama, Toru, Hayakawa, Masahiko, Yokota, Yasuhiro, Tatsumi, Eri, Matsuoka, Moe, Sakatani, Naoya, Honda, Rie, Kameda, Shingo, Suzuki, Hidehiko, Cho, Yuichiro, Yoshioka, Kazuo, Ogawa, Kazunori, Shirai, Kei, Sawada, Hirotaka, and Sugita, Seiji

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Zodiacal light (ZL) is sunlight scattered by interplanetary dust particles (IDPs) at optical wavelengths. The spatial distribution of IDPs in the Solar System may hold an important key to understanding the evolution of the Solar System and material transportation within it. The number density of IDPs can be expressed as $n(r) \sim r^{-\alpha}$, and the exponent $\alpha \sim 1.3$ was obtained by previous observations from interplanetary space by Helios 1/2 and Pioneer 10/11 in the 1970s and 1980s. However, no direct measurements of $\alpha$ based on ZL observations from interplanetary space outside Earth's orbit have been performed since then. Here, we introduce initial results for the radial profile of the ZL at optical wavelengths observed over the range 0.76-1.06 au by ONC-T aboard the Hayabusa2# mission in 2021-2022. The ZL brightness we obtained is well reproduced by a model brightness, although there is a small excess of the observed ZL brightness over the model brightness at around 0.9 au. The radial power-law index we obtained is $\alpha = 1.30 \pm 0.08$, which is consistent with previous results based on ZL observations. The dominant source of uncertainty arises from the uncertainty in estimating the diffuse Galactic light (DGL)., Comment: 22 pages, 19 figures, 4 tables, accepted for publication by Earth, Planets and Space

Published
2023
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4. Quantitative Weathering Assessment of Granite Rock Slope Surfaces in Malaysia Using Image Analysis and CIELAB Color Data: A Case Study

Author

Razali, Mazlina, Ismail, Mohd Ashraf Mohamad, Nagendran, Sharan Kumar, Zainal, Zuraini, Tobe, Hayato, Date, Kensuke, Yokota, Yasuhiro, Hussin, Hamzah, Förstner, Ulrich, Series Editor, Rulkens, Wim H., Series Editor, Wang, Sijing, editor, Huang, Runqiu, editor, Azzam, Rafig, editor, and Marinos, Vassilis P., editor

Published
2024
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5. Characterization of the MASCOT landing area by Hayabusa2

Author

Schröder, Stefan, Sakatani, Naoya, Honda, Rie, Tatsumi, Eri, Yokota, Yasuhiro, Domingue, Deborah, Cho, Yuichiro, Kameda, Shingo, Kitazato, Kohei, Kouyama, Toru, Matsuoka, Moe, Miura, Akira, Morota, Tomokatsu, Okada, Tatsuaki, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Sugita, Seiji, Tanaka, Satoshi, Yabuta, Hikaru, Yamada, Manabu, Grott, Matthias, Hamm, Maximilian, Ho, Tra-Mi, Jaumann, Ralf, Mottola, Stefano, Otto, Katharina, Schmitz, Nicole, and Scholten, Frank

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Context. After landing on C-type asteroid Ryugu, MASCOT imaged brightly colored, submillimeter-sized inclusions in a small rock. Hayabusa2 successfully returned a sample of small particles from the surface of Ryugu, but none of these appear to harbor such inclusions. The samples are considered representative of Ryugu. Aims. To understand the apparent discrepancy between MASCOT observations and Ryugu samples, we assess whether the MASCOT landing site, and the rock by implication, is perhaps atypical for Ryugu. Methods. We analyzed observations of the MASCOT landing area acquired by three instruments on board Hayabusa2: a camera (ONC), a near-infrared spectrometer (NIRS3), and a thermal infrared imager (TIR). We compared the landing area properties thus retrieved with those of the average Ryugu surface. Results. We selected several areas and landforms in the landing area for analysis: a small crater, a collection of smooth rocks, and the landing site itself. The crater is relatively blue and the rocks are relatively red. The spectral and thermophysical properties of the landing site are very close to those of the average Ryugu surface. The spectral properties of the MASCOT rock are probably close to average, but its thermal inertia may be somewhat higher. Conclusions. The MASCOT rock can also be considered representative of Ryugu. Some of the submillimeter-sized particles in the returned samples stand out because of their atypical spectral properties. Such particles may be present as inclusions in the MASCOT rock.

Published
2022
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6. The spatial distribution of impact craters on Ryugu

Author

Hirata, Naoyuki, Morota, Tomokatsu, Cho, Yuichiro, Kanamaru, Masanori, Watanabe, Sei-ichiro, Sugita, Seiji, Hirata, Naru, Yamamoto, Yukio, Noguchi, Rina, Shimaki, Yuri, Tatsumi, Eri, Yoshioka, Kazuo, Sawada, Hirotaka, Yokota, Yasuhiro, Sakatani, Naoya, Hayakawa, Masahiko, Matsuoka, Moe, Honda, Rie, Kameda, Shingo, Yamada, Mamabu, Kouyama, Toru, Suzuki, Hidehiko, Honda, Chikatoshi, Ogawa, Kazunori, Tsuda, Yuichi, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Kikuchi, Shota, Yamaguchi, Tomohiro, Ogawa, Naoko, Ono, Go, Mimasu, Yuya, Yoshikawa, Kent, Takahashi, Tadateru, Takei, Yuto, Fujii, Atsushi, Takeuchi, Hiroshi, Okada, Tatsuaki, Shirai, Kei, and Iijima, Yu-ichi

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Asteroid 162173 Ryugu has numerous craters. The initial measurement of impact craters on Ryugu, by Sugita et al. (2019), is based on Hayabusa2 ONC images obtained during the first month after the arrival of Hayabusa2 in June 2018. Utilizing new images taken until February 2019, we constructed a global impact crater catalogue of Ryugu, which includes all craters larger than 20 m in diameter on the surface of Ryugu. As a result, we identified 77 craters on the surface of Ryugu. Ryugu shows variation in crater density which cannot be explained by the randomness of cratering; there are more craters at lower latitudes and fewer at higher latitudes, and fewer craters in the western bulge (160 E - 290 E) than in the region around the meridian (300 E - 30 E). This variation implies a complicated geologic history for Ryugu. It seems that the longitudinal variation in crater density simply indicates variation in the crater ages; the cratered terrain around the meridian seems to be geologically old while the western bulge is relatively young. The latitudinal variation in crater density suggests that the equatorial ridge of Ryugu is a geologically old structure; however, this could be alternatively explained by a collision with many fission fragments during a short rotational period of Ryugu in the past., Comment: 18 pages 3 figures

Published
2022
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8. Resurfacing processes constrained by crater distribution on Ryugu

Author

Takaki, Naofumi, Cho, Yuichiro, Morota, Tomokatsu, Tatsumi, Eri, Honda, Rie, Kameda, Shingo, Yokota, Yasuhiro, Sakatani, Naoya, Kouyama, Toru, Hayakawa, Masahiko, Matsuoka, Moe, Yamada, Manabu, Honda, Chikatoshi, Suzuki, Hidehiko, Yoshioka, Kazuo, Ogawa, Kazunori, Sawada, Hirotaka, Michel, Patrick, and Sugita, Seiji

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Understanding the geological modification processes on asteroids can provide information concerning their surface history. Images of small asteroids from spacecraft show a depletion in terms of smaller craters. Seismic shaking was considered to be responsible for crater erasure and the main driver modifying the geology of asteroids via regolith convection or the Brazil nut effect. However, a recent artificial impact experiment on the asteroid Ryugu by the Japanese Hayabusa2 mission revealed minimal seismic activity. To investigate whether a seismic shaking model can reproduce the observed crater record, the crater distribution on Ryugu was analyzed using crater production functions under cohesionless conditions. Crater retention ages were estimated as a function of crater diameter for Ryugu, Itokawa, Eros, and Bennu using the crater size-frequency distribution and crater production function estimated for those asteroids. We found that the power-law indices "a" are inconsistent with diffusion processes (e.g., seismic shaking, a=2). This result suggests that seismic shaking models based on diffusion equations cannot explain the crater distribution on small asteroids. Alternative processes include surface flows, possibly at the origin of geomorphological and spectral features of Ryugu. We demonstrate that the vertical mixing of material at depths shallower than 1 m occurs over 10^3-10^5 yr by cratering and obliteration. The young surface age of Ryugu is consistent with the slow space weathering that results from cratering, as suggested in previous studies. The timescale (10^4-10^6 yr) required for resurfacing at depths of 2-4 m can be compared with the cosmic-ray exposure ages of returned samples to constrain the distribution of impactors that collide with Ryugu., Comment: 30 pages, 9 figures, 2 tables. Submitted to Icarus

Published
2021
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9. Image registration for multi-band images taken by ONC-T onboard Hayabusa2

Author

Kouyama, Toru, Tatsumi, Eri, Honda, Chikatoshi, Honda, Rie, Morota, Tomokatsu, Yokota, Yasuhiro, Kameda, Shingo, Yamada, Manabu, Suzuki, Hidehiko, Sakatani, Naoya, Hayakawa, Masahiko, Cho, Yuichiro, Matsuoka, Moe, Yoshioka, Kazuo, Sawada, Hirotaka, and Sugita, Seiji

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Hayabusa2, a Japanese sample-return mission to a C-type asteroid, arrived at its target 162173 Ryugu in June 2018. The optical navigation cameras (ONC-T, ONC-W1, ONC-W2) successfully obtained numerous images of Ryugu. ONC-T is a telescopic framing camera with a charge-coupled device (CCD), has seven filter bands in ultraviolet, visible and near infrared wavelength ranges, and were used to map the spectral distribution of the Ryugu surface. Since the locations of a target seen in ONC-T images are slightly different among different wavelength images in one multi-band observation sequence due to changes in spacecraft positions and attitudes during the filter-changing sequence, one of the image processing issues is image co-registration among images for different wavelength bands. To quickly complete the image co-registration to meet a limited mission schedule, we combined conventional image co-registration techniques with several improvements based on previous planetary missions. The results of our analysis using actual ONC-T images indicate that image co-registration can reach accuracy on the order of 0.1 pixels, which is sufficient for many spectral mapping applications for Ryugu analyses., Comment: Hayabusa2, ONC-T, Multi-band imaging, Image co-registration, Cross correlation

Published
2021

10. Simultaneous geometric calibration and orbit-attitude determination of Hayabusa2’s deployable camera (DCAM3)

Author

Kikuchi, Shota, Shirai, Kei, Ishibashi, Ko, Wada, Koji, Yokota, Yasuhiro, Honda, Rie, Kadono, Toshihiko, Shimaki, Yuri, Sakatani, Naoya, Ogawa, Kazunori, Sawada, Hirotaka, Saiki, Takanao, Mimasu, Yuya, Takei, Yuto, Sugita, Seiji, Kouyama, Toru, Hirata, Naru, Nakazawa, Satoru, Yoshikawa, Makoto, Tanaka, Satoshi, Watanabe, Sei-ichiro, Tsuda, Yuichi, and Arakawa, Masahiko

Published
2024
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11. Space weathering acts strongly on the uppermost surface of Ryugu

Author

Matsuoka, Moe, Kagawa, Ei-ichi, Amano, Kana, Nakamura, Tomoki, Tatsumi, Eri, Osawa, Takahito, Hiroi, Takahiro, Milliken, Ralph, Domingue, Deborah, Takir, Driss, Brunetto, Rosario, Barucci, Antonella, Kitazato, Kohei, Sugita, Seiji, Fujioka, Yuri, Sasaki, Osamu, Kobayashi, Shiho, Iwata, Takahiro, Morota, Tomokatsu, Yokota, Yasuhiro, Kouyama, Toru, Honda, Rie, Kameda, Shingo, Cho, Yuichiro, Yoshioka, Kazuo, Sawada, Hirotaka, Hayakawa, Masahiko, Sakatani, Naoya, Yamada, Manabu, Suzuki, Hidehiko, Honda, Chikatoshi, Ogawa, Kazunori, Shirai, Kei, Lantz, Cateline, Rubino, Stefano, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2023
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13. Probabilistic generic transformation model between two rock mass properties: specific fracture energy and P-wave velocity

Author

Shuku, Takayuki, Phoon, Kok-Kwang, Ishii, Masako, Kumagai, Takeru, Yokota, Yasuhiro, and Date, Kensuke

Subjects
Rock mechanics -- Analysis, Excavation -- Models, Earth sciences
Abstract

This study proposed a probabilistic generic transformation model between two rock mass properties, specific fracture energy, [E.sub.v], and P-wave velocity, [V.sub.p]. To build the transformation model, 12 pairwise data sets of [E.sub.v] and [V.sub.p] were collected from six different construction sites involving construction of mountain tunnels in Japan. This database is labeled as 'RockMass/2/350'. A probabilistic transformation model was built based on a bivariate standard normal distribution with these 350 data points. The model is generic, because it is based on a variety of sites. The performance of the constructed transformation model was evaluated through a cross-validation. It was found that 98.2% of the validation data fell within the computed 95% confidence interval of the model estimation, and this result provides a preliminary validation of the probabilistic transformation model. Unlike existing deterministic transformation models for estimating [V.sub.p] from [E.sub.v], the proposed model can explicitly evaluate the transformation uncertainty with a quantitative metric such as a percentile. For practical application, a 3D model of the spatial distribution for Young's modulus, E, was visualized based on the proposed transformation model. Since the proposed model is probabilistic, it can provide the spatial distribution for percentiles of E values. The constructed 3D model presented in this paper can be directly used as an input data for finite element or finite difference analysis, and probabilistic evaluation of excavation simulation is feasible based on the proposed probabilistic model. The quantitative information on such uncertainty can be useful in decision-making for tunnel constructions, such as selection of a cautious characteristic value. Key words: rock mass properties, specific fracture energy, P-wave velocity, generic transformation model, mountain tunnels, Introduction With advancements in information and communication technology in recent years, it has become more feasible to collect reliable data quickly and easily in tunnel construction practice. A computer-controlled drilling [...]

Published
2023
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16. A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

Author

Noguchi, Takaaki, Matsumoto, Toru, Miyake, Akira, Igami, Yohei, Haruta, Mitsutaka, Saito, Hikaru, Hata, Satoshi, Seto, Yusuke, Miyahara, Masaaki, Tomioka, Naotaka, Ishii, Hope A., Bradley, John P., Ohtaki, Kenta K., Dobrică, Elena, Leroux, Hugues, Le Guillou, Corentin, Jacob, Damien, de la Peña, Francisco, Laforet, Sylvain, Marinova, Maya, Langenhorst, Falko, Harries, Dennis, Beck, Pierre, Phan, Thi H. V., Rebois, Rolando, Abreu, Neyda M., Gray, Jennifer, Zega, Thomas, Zanetta, Pierre-M., Thompson, Michelle S., Stroud, Rhonda, Burgess, Kate, Cymes, Brittany A., Bridges, John C., Hicks, Leon, Lee, Martin R., Daly, Luke, Bland, Phil A., Zolensky, Michael E., Frank, David R., Martinez, James, Tsuchiyama, Akira, Yasutake, Masahiro, Matsuno, Junya, Okumura, Shota, Mitsukawa, Itaru, Uesugi, Kentaro, Uesugi, Masayuki, Takeuchi, Akihisa, Sun, Mingqi, Enju, Satomi, Takigawa, Aki, Michikami, Tatsuhiro, Nakamura, Tomoki, Matsumoto, Megumi, Nakauchi, Yusuke, Abe, Masanao, Arakawa, Masahiko, Fujii, Atsushi, Hayakawa, Masahiko, Hirata, Naru, Hirata, Naoyuki, Honda, Rie, Honda, Chikatoshi, Hosoda, Satoshi, Iijima, Yu-ichi, Ikeda, Hitoshi, Ishiguro, Masateru, Ishihara, Yoshiaki, Iwata, Takahiro, Kawahara, Kousuke, Kikuchi, Shota, Kitazato, Kohei, Matsumoto, Koji, Matsuoka, Moe, Mimasu, Yuya, Miura, Akira, Morota, Tomokatsu, Nakazawa, Satoru, Namiki, Noriyuki, Noda, Hirotomo, Noguchi, Rina, Ogawa, Naoko, Ogawa, Kazunori, Okada, Tatsuaki, Okamoto, Chisato, Ono, Go, Ozaki, Masanobu, Saiki, Takanao, Sakatani, Naoya, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Sugita, Seiji, Takei, Yuto, Takeuchi, Hiroshi, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Tsukizaki, Ryudo, Wada, Koji, Yamada, Manabu, Yamada, Tetsuya, Yamamoto, Yukio, Yano, Hajime, Yokota, Yasuhiro, Yoshihara, Keisuke, Yoshikawa, Makoto, Yoshikawa, Kent, Fukai, Ryohta, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Soejima, Hiromichi, Suzuki, Ayako I., Usui, Tomohiro, Yada, Toru, Yamamoto, Daiki, Yogata, Kasumi, Yoshitake, Miwa, Connolly, Jr, Harold C., Lauretta, Dante S., Yurimoto, Hisayoshi, Nagashima, Kazuhide, Kawasaki, Noriyuki, Sakamoto, Naoya, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2023
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17. The Western Bulge of 162173 Ryugu Formed as a Result of a Rotationally Driven Deformation Process

Author

Hirabayashi, Masatoshi, Tatsumi, Eri, Miyamoto, Hideaki, Komatsu, Goro, Sugita, Seiji, Watanabe, Sei-ichiro, Scheeres, Daniel J., Barnouin, Olivier S., Michel, Patrick, Honda, Chikatoshi, Michikami, Tatsuhiro, Cho, Yuichiro, Morota, Tomokatsu, Hirata, Naru, Hirata, Naoyuki, Sakatani, Naoya, Schwartz, Stephen R., Honda, Rie, Yokota, Yasuhiro, Kameda, Shingo, Suzuki, Hidehiko, Kouyama, Toru, Hayakawa, Masahiko, Matsuoka, Moe, Yoshioka, Kazuo, Ogawa, Kazunori, Sawada, Hirotaka, Yoshikawa, Makoto, and Tsuda, Yuichi

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

162173 Ryugu, the target of Hayabusa2, has a round shape with an equatorial ridge, which is known as a spinning top-shape. A strong centrifugal force is a likely contributor to Ryugu's top-shaped features. Observations by Optical Navigation Camera onboard Hayabusa2 show a unique longitudinal variation in geomorphology; the western side of this asteroid, later called the western bulge, has a smooth surface and a sharp equatorial ridge, compared to the other side. Here, we propose a structural deformation process that generated the western bulge. Applying the mission-derived shape model, we employ a finite element model technique to analyze the locations that experience structural failure within the present shape. Assuming that materials are uniformly distributed, our model shows the longitudinal variation in structurally failed regions when the spin period is shorter than ~3.75 h. Ryugu is structurally intact in the subsurface region of the western bulge while other regions are sensitive to structural failure. We infer that this variation is indicative of the deformation process that occurred in the past, and the western bulge is more relaxed structurally than the other region. Our analysis also shows that this deformation process might occur at a spin period between ~3.5 h and ~3.0 h, providing the cohesive strength ranging between ~4 Pa and ~10 Pa., Comment: 8 pages, 5 figures, published in the Astrophysical Journal Letters, 874, 1, L10

Published
2019
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19. A pristine record of outer Solar System materials from asteroid Ryugu’s returned sample

Author

Ito, Motoo, Tomioka, Naotaka, Uesugi, Masayuki, Yamaguchi, Akira, Shirai, Naoki, Ohigashi, Takuji, Liu, Ming-Chang, Greenwood, Richard C., Kimura, Makoto, Imae, Naoya, Uesugi, Kentaro, Nakato, Aiko, Yogata, Kasumi, Yuzawa, Hayato, Kodama, Yu, Tsuchiyama, Akira, Yasutake, Masahiro, Findlay, Ross, Franchi, Ian A., Malley, James A., McCain, Kaitlyn A., Matsuda, Nozomi, McKeegan, Kevin D., Hirahara, Kaori, Takeuchi, Akihisa, Sekimoto, Shun, Sakurai, Ikuya, Okada, Ikuo, Karouji, Yuzuru, Arakawa, Masahiko, Fujii, Atsushi, Fujimoto, Masaki, Hayakawa, Masahiko, Hirata, Naoyuki, Hirata, Naru, Honda, Rie, Honda, Chikatoshi, Hosoda, Satoshi, Iijima, Yu-ichi, Ikeda, Hitoshi, Ishiguro, Masateru, Ishihara, Yoshiaki, Iwata, Takahiro, Kawahara, Kosuke, Kikuchi, Shota, Kitazato, Kohei, Matsumoto, Koji, Matsuoka, Moe, Michikami, Tatsuhiro, Mimasu, Yuya, Miura, Akira, Mori, Osamu, Morota, Tomokatsu, Nakazawa, Satoru, Namiki, Noriyuki, Noda, Hirotomo, Noguchi, Rina, Ogawa, Naoko, Ogawa, Kazunori, Okada, Tatsuaki, Okamoto, Chisato, Ono, Go, Ozaki, Masanobu, Saiki, Takanao, Sakatani, Naoya, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Sugita, Seiji, Takei, Yuto, Takeuchi, Hiroshi, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Tsukizaki, Ryudo, Wada, Koji, Yamada, Manabu, Yamada, Tetsuya, Yamamoto, Yukio, Yano, Hajime, Yokota, Yasuhiro, Yoshihara, Keisuke, Yoshikawa, Makoto, Yoshikawa, Kent, Fukai, Ryota, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nishimura, Masahiro, Soejima, Hiromichi, Iwamae, Ayako, Yamamoto, Daiki, Yoshitake, Miwa, Yada, Toru, Abe, Masanao, Usui, Tomohiro, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2022
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24. Updated Inflight Calibration of Hayabusa2's Optical Navigation Camera (ONC) for Scientific Observations during the Cruise Phase

Author

Tatsumi, Eri, Kouyama, Toru, Suzuki, Hidehiko, Yamada, Manabu, Sakatani, Naoya, Kameda, Shingo, Yokota, Yasuhiro, Honda, Rie, Morota, Tomokatsu, Moroi, Keiichi, Tanabe, Naoya, Kamiyoshihara, Hiroaki, Ishida, Marika, Yoshioka, Kazuo, Sato, Hiroyuki, Honda, Chikatoshi, Hayakawa, Masahiko, Kitazato, Kohei, Sawada, Hirotaka, and Sugita, Seiji

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

The Optical Navigation Camera (ONC-T, ONC-W1, ONC-W2) onboard Hayabusa2 are also being used for scientific observations of the mission target, C-complex asteroid 162173 Ryugu. Science observations and analyses require rigorous instrument calibration. In order to meet this requirement, we have conducted extensive inflight observations during the 3.5 years of cruise after the launch of Hayabusa2 on 3 December 2014. In addition to the first inflight calibrations by Suzuki et al. (2018), we conducted an additional series of calibrations, including read-out smear, electronic-interference noise, bias, dark current, hot pixels, sensitivity, linearity, flat-field, and stray light measurements for the ONC. Moreover, the calibrations, especially flat-fields and sensitivities, of ONC-W1 and -W2 are updated for the analysis of the low-altitude (i.e., high-resolution) observations, such as the gravity measurement, touchdowns, and the descents for MASCOT and MINERVA-II payload releases. The radiometric calibration for ONC-T is also updated in this study based on star and Moon observations. Our updated inflight sensitivity measurements suggest the accuracy of the absolute radiometric calibration contains less than 1.8% error for the ul-, b-, v-, Na-, w-, and x-bands based on star calibration observations and ~5% for the p-band based on lunar calibration observations. The radiance spectra of the Moon, Jupiter, and Saturn from the ONC-T show good agreement with the spacecraft-based observations of the Moon from SP/SELENE and WAC/LROC and with ground-based telescopic observations for Jupiter and Saturn., Comment: Submitted to Icarus

Published
2018
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26. Site selection for the Hayabusa2 artificial cratering and subsurface material sampling on Ryugu

Author

Kikuchi, Shota, Watanabe, Sei-ichiro, Wada, Koji, Saiki, Takanao, Yabuta, Hikaru, Sugita, Seiji, Abe, Masanao, Arakawa, Masahiko, Cho, Yuichiro, Hayakawa, Masahiko, Hirata, Naoyuki, Hirata, Naru, Honda, Chikatoshi, Honda, Rie, Ishibashi, Ko, Ishihara, Yoshiaki, Iwata, Takahiro, Kadono, Toshihiko, Kameda, Shingo, Kitazato, Kohei, Kouyama, Toru, Matsumoto, Koji, Matsuoka, Moe, Michikami, Tatsuhiro, Mimasu, Yuya, Miura, Akira, Morota, Tomokatsu, Nakamura, Tomoki, Nakazawa, Satoru, Namiki, Noriyuki, Noguchi, Rina, Ogawa, Kazunori, Ogawa, Naoko, Okada, Tatsuaki, Ono, Go, Sakatani, Naoya, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Tachibana, Shogo, Takei, Yuto, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Yamada, Manabu, Yamamoto, Yukio, Yokota, Yasuhiro, Yoshikawa, Kent, Yoshikawa, Makoto, and Tsuda, Yuichi

Published
2022
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27. Three-axial shape distributions of pebbles, cobbles and boulders smaller than a few meters on asteroid Ryugu

Author

Michikami, Tatsuhiro, Hagermann, Axel, Morota, Tomokatsu, Yokota, Yasuhiro, Urakawa, Seitaro, Okamura, Hiroyuki, Tanabe, Naoya, Yumoto, Koki, Ebihara, Tatsuki, Cho, Yuichiro, Ernst, Carolyn M., Hayakawa, Masahiko, Hirabayashi, Masatoshi, Hirata, Naru, Honda, Chikatoshi, Honda, Rie, Kameda, Shingo, Kanamaru, Masanori, Kikuchi, Hiroshi, Kikuchi, Shota, Kouyama, Toru, Matsuoka, Moe, Miyamoto, Hideaki, Noguchi, Takaaki, Noguchi, Rina, Ogawa, Kazunori, Okada, Tatsuaki, Sakatani, Naoya, Sasaki, Sho, Sawada, Hirotaka, Sugimoto, Chiho, Suzuki, Hidehiko, Tanaka, Satoshi, Tatsumi, Eri, Tsuchiyama, Akira, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yamada, Manabu, Yoshikawa, Makoto, Yoshioka, Kazuo, and Sugita, Seiji

Published
2022
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28. Resurfacing processes constrained by crater distribution on Ryugu

Author

Takaki, Naofumi, Cho, Yuichiro, Morota, Tomokatsu, Tatsumi, Eri, Honda, Rie, Kameda, Shingo, Yokota, Yasuhiro, Sakatani, Naoya, Kouyama, Toru, Hayakawa, Masahiko, Matsuoka, Moe, Yamada, Manabu, Honda, Chikatoshi, Suzuki, Hidehiko, Yoshioka, Kazuo, Ogawa, Kazunori, Sawada, Hirotaka, Michel, Patrick, and Sugita, Seiji

Published
2022
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29. Preliminary analysis of the Hayabusa2 samples returned from C-type asteroid Ryugu

Author

Yada, Toru, Abe, Masanao, Okada, Tatsuaki, Nakato, Aiko, Yogata, Kasumi, Miyazaki, Akiko, Hatakeda, Kentaro, Kumagai, Kazuya, Nishimura, Masahiro, Hitomi, Yuya, Soejima, Hiromichi, Yoshitake, Miwa, Iwamae, Ayako, Furuya, Shizuho, Uesugi, Masayuki, Karouji, Yuzuru, Usui, Tomohiro, Hayashi, Tasuku, Yamamoto, Daiki, Fukai, Ryota, Sugita, Seiji, Cho, Yuichiro, Yumoto, Koki, Yabe, Yuna, Bibring, Jean-Pierre, Pilorget, Cedric, Hamm, Vincent, Brunetto, Rosario, Riu, Lucie, Lourit, Lionel, Loizeau, Damien, Lequertier, Guillaume, Moussi-Soffys, Aurelie, Tachibana, Shogo, Sawada, Hirotaka, Okazaki, Ryuji, Takano, Yoshinori, Sakamoto, Kanako, Miura, Yayoi N., Yano, Hajime, Ireland, Trevor R., Yamada, Tetsuya, Fujimoto, Masaki, Kitazato, Kohei, Namiki, Noriyuki, Arakawa, Masahiko, Hirata, Naru, Yurimoto, Hisayoshi, Nakamura, Tomoki, Noguchi, Takaaki, Yabuta, Hikaru, Naraoka, Hiroshi, Ito, Motoo, Nakamura, Eizo, Uesugi, Kentaro, Kobayashi, Katsura, Michikami, Tatsuhiro, Kikuchi, Hiroshi, Hirata, Naoyuki, Ishihara, Yoshiaki, Matsumoto, Koji, Noda, Hirotomo, Noguchi, Rina, Shimaki, Yuri, Shirai, Kei, Ogawa, Kazunori, Wada, Koji, Senshu, Hiroki, Yamamoto, Yukio, Morota, Tomokatsu, Honda, Rie, Honda, Chikatoshi, Yokota, Yasuhiro, Matsuoka, Moe, Sakatani, Naoya, Tatsumi, Eri, Miura, Akira, Yamada, Manabu, Fujii, Atsushi, Hirose, Chikako, Hosoda, Satoshi, Ikeda, Hitoshi, Iwata, Takahiro, Kikuchi, Shota, Mimasu, Yuya, Mori, Osamu, Ogawa, Naoko, Ono, Go, Shimada, Takanobu, Soldini, Stefania, Takahashi, Tadateru, Takei, Yuto, Takeuchi, Hiroshi, Tsukizaki, Ryudo, Yoshikawa, Kent, Terui, Fuyuto, Nakazawa, Satoru, Tanaka, Satoshi, Saiki, Takanao, Yoshikawa, Makoto, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2022
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30. Hayabusa2 pinpoint touchdown near the artificial crater on Ryugu: Trajectory design and guidance performance

Author

Kikuchi, Shota, Saiki, Takanao, Takei, Yuto, Terui, Fuyuto, Ogawa, Naoko, Mimasu, Yuya, Ono, Go, Yoshikawa, Kent, Sawada, Hirotaka, Takeuchi, Hiroshi, Ikeda, Hitoshi, Fujii, Atsushi, Sugita, Seiji, Morota, Tomokatsu, Yamada, Manabu, Honda, Rie, Yokota, Yasuhiro, Sakatani, Naoya, Kameda, Shingo, Kouyama, Toru, Hirata, Naru, Hirata, Naoyuki, Shirai, Kei, Kitazato, Kohei, Nakazawa, Satoru, Yoshikawa, Makoto, Tanaka, Satoshi, Wada, Koji, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2021
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31. Development of image texture analysis technique for boulder distribution measurements: Applications to asteroids Ryugu and Itokawa

Author

Tanabe, Naoya, Cho, Yuichiro, Tatsumi, Eri, Ebihara, Tatsuki, Yumoto, Koki, Michikami, Tatsuhiro, Miyamoto, Hideaki, Morota, Tomokatsu, Honda, Chikatoshi, Michel, Patrick, Otto, Katharina, Barnouin, Olivier, Yoshioka, Kazuo, Sawada, Hirotaka, Yokota, Yasuhiro, Sakatani, Naoya, Hayakawa, Masahiro, Honda, Rie, Kameda, Shingo, Matsuoka, Moe, Yamada, Manabu, Kouyama, Toru, Suzuki, Hidehiko, Ogawa, Kazunori, and Sugita, Seiji

Published
2021
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32. Resurfacing processes on asteroid (162173) Ryugu caused by an artificial impact of Hayabusa2's Small Carry-on Impactor

Author

Honda, Rie, Arakawa, Masahiko, Shimaki, Yuri, Shirai, Kei, Yokota, Yasuhiro, Kadono, Toshihiko, Wada, Koji, Ogawa, Kazunori, Ishibashi, Ko, Sakatani, Naoya, Nakazawa, Satoru, Yasui, Minami, Morota, Tomokatsu, Kameda, Shingo, Tatsumi, Eri, Yamada, Manabu, Kouyama, Toru, Cho, Yuichiro, Matsuoka, Moe, Suzuki, Hidehiko, Honda, Chikatoshi, Hayakawa, Masahiko, Yoshioka, Kazuo, Hirata, Naru, Hirata, Naoyuki, Sawada, Hirotaka, Sugita, Seiji, Saiki, Takanao, Imamura, Hiroshi, Takagi, Yasuhiko, Yano, Hajime, Okamoto, Chisato, Tsuda, Yuichi, and Iijima, Yu-ichi

Published
2021
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33. Contributors

Author

Abe, Masanao, primary, Arakawa, Masahiko, additional, Bellerose, Julie, additional, Danno, Satoshi, additional, Farnocchia, Davide, additional, Fujii, Atsushi, additional, Fujita, Kazuhisa, additional, Fujita, Naoyuki, additional, Furukawa, Katsumi, additional, Goto, Daisuke, additional, Hayashi, Daisuke, additional, Hihara, Hiroki, additional, Hirabayashi, Masatoshi, additional, Hirose, Chikako, additional, Ho, Tra-Mi, additional, Honda, Rie, additional, Hosoda, Satoshi, additional, Ichikawa, Tsutomu, additional, Ikeda, Hitoshi, additional, Ishibashi, Ko, additional, Ishimaru, Takahiro, additional, Ito, Taichi, additional, Kadono, Toshihiko, additional, Kagawa, Hideshi, additional, Kameda, Shingo, additional, Kato, Takaaki, additional, Kawahara, Kosuke, additional, Kikuchi, Shota, additional, Kitazato, Kohei, additional, Kobiki, Noboru, additional, Kouyama, Toru, additional, Kushiki, Kenichi, additional, Maru, Yusuke, additional, Masuda, Tetsuya, additional, Matsuhisa, Takashi, additional, Matsuoka, Masatoshi, additional, Matsuoka, Moe, additional, Matsushima, Kota, additional, Michigami, Keisuke, additional, Mimasu, Yuya, additional, Miura, Akira, additional, Mori, Osamu, additional, Morota, Tomokatsu, additional, Moussi, Aurelie, additional, Nagata, Taiichi, additional, Nakatsuka, Junichi, additional, Nakazawa, Satoru, additional, Namiki, Noriyuki, additional, Nishiyama, Kazutaka, additional, Oda, Kenji, additional, Ogawa, Kazunori, additional, Ogawa, Naoko, additional, Ohnishi, Takafumi, additional, Okada, Tatsuaki, additional, Oki, Yusuke, additional, Ono, Go, additional, Oshima, Takeshi, additional, Saiki, Takanao, additional, Sakatani, Naoya, additional, Sano, Junpei, additional, Sawada, Hirotaka, additional, Sawai, Shujiro, additional, Shida, Maki, additional, Shimada, Daisuke, additional, Shimada, Takanobu, additional, Shirai, Kei, additional, Soldini, Stefania, additional, Sugita, Seiji, additional, Tachibana, Shogo, additional, Takami, Tsuyoshi, additional, Takei, Yuto, additional, Takeuchi, Hiroshi, additional, Tanaka, Satoshi, additional, Taniguchi, Sho, additional, Tanno, Hideyuki, additional, Tarzi, Zahi, additional, Tasker, Elizabeth, additional, Tatsumi, Eri, additional, Terui, Fuyuto, additional, Toda, Tomoaki, additional, Tsuda, Yuichi, additional, Tsukizaki, Ryudo, additional, Uo, Masashi, additional, Uramachi, Hikaru, additional, Van Wal, Stefaan, additional, Wada, Koji, additional, Watanabe, Sei-ichiro, additional, Yabuta, Hikaru, additional, Yamada, Manabu, additional, Yamada, Tetsuya, additional, Yamaguchi, Tomohiro, additional, Yasuda, Seiji, additional, Yokota, Yasuhiro, additional, Yoshikawa, Keisuke, additional, Yoshikawa, Kent, additional, Yoshikawa, Makoto, additional, and Yumoto, Koki, additional

Published
2022
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35. Sensitivity degradation of optical navigation camera and attempts for dust removal

Author

Ogawa, Naoko, primary, Yokota, Yasuhiro, additional, Yumoto, Koki, additional, Tatsumi, Eri, additional, Kouyama, Toru, additional, Morota, Tomokatsu, additional, Yamada, Manabu, additional, Hosoda, Satoshi, additional, Tsukizaki, Ryudo, additional, Nishiyama, Kazutaka, additional, Honda, Rie, additional, Sugita, Seiji, additional, Terui, Fuyuto, additional, Mimasu, Yuya, additional, Yoshikawa, Kent, additional, Ono, Go, additional, Takei, Yuto, additional, Saiki, Takanao, additional, and Tsuda, Yuichi, additional

Published
2022
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40. Crater depth-to-diameter ratios on asteroid 162173 Ryugu

Author

Noguchi, Rina, Hirata, Naoyuki, Hirata, Naru, Shimaki, Yuri, Nishikawa, Naoki, Tanaka, Sayuri, Sugiyama, Takaaki, Morota, Tomokatsu, Sugita, Seiji, Cho, Yuichiro, Honda, Rie, Kameda, Shingo, Tatsumi, Eri, Yoshioka, Kazuo, Sawada, Hirotaka, Yokota, Yasuhiro, Sakatani, Naoya, Hayakawa, Masahiko, Matsuoka, Moe, Yamada, Manabu, Kouyama, Toru, Suzuki, Hidehiko, Honda, Chikatoshi, Ogawa, Kazunori, Kanamaru, Masanori, and Watanabe, Sei-ichiro

Published
2021
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43. The spatial distribution of impact craters on Ryugu

Author

Hirata, Naoyuki, Morota, Tomokatsu, Cho, Yuichiro, Kanamaru, Masanori, Watanabe, Sei-ichiro, Sugita, Seiji, Hirata, Naru, Yamamoto, Yukio, Noguchi, Rina, Shimaki, Yuri, Tatsumi, Eri, Yoshioka, Kazuo, Sawada, Hirotaka, Yokota, Yasuhiro, Sakatani, Naoya, Hayakawa, Masahiko, Matsuoka, Moe, Honda, Rie, Kameda, Shingo, Yamada, Manabu, Kouyama, Toru, Suzuki, Hidehiko, Honda, Chikatoshi, Ogawa, Kazunori, Tsuda, Yuichi, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Kikuchi, Shota, Yamaguchi, Tomohiro, Ogawa, Naoko, Ono, Go, Mimasu, Yuya, Yoshikawa, Kent, Takahashi, Tadateru, Takei, Yuto, Fujii, Atsushi, Takeuchi, Hiroshi, Okada, Tatsuaki, Shirai, Kei, and Iijima, Yu-ichi

Published
2020
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44. Motion reconstruction of the small carry-on impactor aboard Hayabusa2

Author

Saiki, Takanao, Mimasu, Yuya, Takei, Yuto, Yamada, Manabu, Sawada, Hirotaka, Ogawa, Kazunori, Ogawa, Naoko, Takeuchi, Hiroshi, Miura, Akira, Shimaki, Yuri, Wada, Koji, Honda, Rie, Yokota, Yasuhiro, Shirai, Kei, Sano, Naruhisa, Ohtsuka, Hirohito, Ono, Go, Yoshikawa, Kent, Kikuchi, Shota, Hirose, Chikako, Yamamoto, Yukio, Iwata, Takahiro, Arakawa, Masahiko, Sugita, Seiji, Tanaka, Satoshi, Terui, Fuyuto, Yoshikawa, Makoto, Nakazawa, Satoru, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2020
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45. Spectrally blue hydrated parent body of asteroid (162173) Ryugu

Author

Tatsumi, Eri, Sakatani, Naoya, Riu, Lucie, Matsuoka, Moe, Honda, Rie, Morota, Tomokatsu, Kameda, Shingo, Nakamura, Tomoki, Zolensky, Michael, Brunetto, Rosario, Hiroi, Takahiro, Sasaki, Sho, Watanabe, Sei’ichiro, Tanaka, Satoshi, Takita, Jun, Pilorget, Cédric, de León, Julia, Popescu, Marcel, Rizos, Juan Luis, Licandro, Javier, Palomba, Ernesto, Domingue, Deborah, Vilas, Faith, Campins, Humberto, Cho, Yuichiro, Yoshioka, Kazuo, Sawada, Hirotaka, Yokota, Yasuhiro, Hayakawa, Masahiko, Yamada, Manabu, Kouyama, Toru, Suzuki, Hidehiko, Honda, Chikatoshi, Ogawa, Kazunori, Kitazato, Kohei, Hirata, Naru, Hirata, Naoyuki, Tsuda, Yuichi, Yoshikawa, Makoto, Saiki, Takanao, Terui, Fuyuto, Nakazawa, Satoru, Takei, Yuto, Takeuchi, Hiroshi, Yamamoto, Yukio, Okada, Tatsuaki, Shimaki, Yuri, Shirai, Kei, and Sugita, Seiji

Published
2021
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46. Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

Author

Noda, Hirotomo, Senshu, Hiroki, Matsumoto, Koji, Namiki, Noriyuki, Mizuno, Takahide, Sugita, Seiji, Abe, Shinsuke, Araki, Hiroshi, Asari, Kazuyoshi, Cho, Yuichiro, Fujii, Atsushi, Hayakawa, Masahiko, Higuchi, Arika, Hirata, Naoyuki, Hirata, Naru, Honda, Chikatoshi, Honda, Rie, Ishihara, Yoshiaki, Kameda, Shingo, Kikuchi, Shota, Kouyama, Toru, Matsuoka, Moe, Mimasu, Yuya, Morota, Tomokatsu, Nakazawa, Satoru, Ogawa, Kazunori, Ogawa, Naoko, Ono, Go, Oshigami, Shoko, Saiki, Takanao, Sakatani, Naoya, Sasaki, Sho, Sawada, Hirotaka, Shizugami, Makoto, Suzuki, Hidehiko, Takahashi, Tadateru, Takei, Yuto, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Tsuda, Yuichi, Tsuruta, Seiitsu, Watanabe, Sei-ichiro, Yamada, Manabu, Yamada, Ryuhei, Yamaguchi, Tomohiro, Yamamoto, Keiko, Yokota, Yasuhiro, Yoshida, Fumi, Yoshikawa, Kent, Yoshikawa, Makoto, and Yoshioka, Kazuo

Published
2021
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48. Highly porous nature of a primitive asteroid revealed by thermal imaging

Author

Okada, Tatsuaki, Fukuhara, Tetsuya, Tanaka, Satoshi, Taguchi, Makoto, Arai, Takehiko, Senshu, Hiroki, Sakatani, Naoya, Shimaki, Yuri, Demura, Hirohide, Ogawa, Yoshiko, Suko, Kentaro, Sekiguchi, Tomohiko, Kouyama, Toru, Takita, Jun, Matsunaga, Tsuneo, Imamura, Takeshi, Wada, Takehiko, Hasegawa, Sunao, Helbert, Jörn, Müller, Thomas G., Hagermann, Axel, Biele, Jens, Grott, Matthias, Hamm, Maximilian, Delbo, Marco, Hirata, Naru, Hirata, Naoyuki, Yamamoto, Yukio, Sugita, Seiji, Namiki, Noriyuki, Kitazato, Kohei, Arakawa, Masahiko, Tachibana, Shogo, Ikeda, Hitoshi, Ishiguro, Masateru, Wada, Koji, Honda, Chikatoshi, Honda, Rie, Ishihara, Yoshiaki, Matsumoto, Koji, Matsuoka, Moe, Michikami, Tatsuhiro, Miura, Akira, Morota, Tomokatsu, Noda, Hirotomo, Noguchi, Rina, Ogawa, Kazunori, Shirai, Kei, Tatsumi, Eri, Yabuta, Hikaru, Yokota, Yasuhiro, Yamada, Manabu, Abe, Masanao, Hayakawa, Masahiko, Iwata, Takahiro, Ozaki, Masanobu, Yano, Hajime, Hosoda, Satoshi, Mori, Osamu, Sawada, Hirotaka, Shimada, Takanobu, Takeuchi, Hiroshi, Tsukizaki, Ryudo, Fujii, Atsushi, Hirose, Chikako, Kikuchi, Shota, Mimasu, Yuya, Ogawa, Naoko, Ono, Go, Takahashi, Tadateru, Takei, Yuto, Yamaguchi, Tomohiro, Yoshikawa, Kent, Terui, Fuyuto, Saiki, Takanao, Nakazawa, Satoru, Yoshikawa, Makoto, Watanabe, Seiichiro, and Tsuda, Yuichi

Published
2020
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49. Boulder size and shape distributions on asteroid Ryugu

Author

Michikami, Tatsuhiro, Honda, Chikatoshi, Miyamoto, Hideaki, Hirabayashi, Masatoshi, Hagermann, Axel, Irie, Terunori, Nomura, Keita, Ernst, Carolyn M., Kawamura, Masaki, Sugimoto, Kiichi, Tatsumi, Eri, Morota, Tomokatsu, Hirata, Naru, Noguchi, Takaaki, Cho, Yuichiro, Kameda, Shingo, Kouyama, Toru, Yokota, Yasuhiro, Noguchi, Rina, Hayakawa, Masahiko, Hirata, Naoyuki, Honda, Rie, Matsuoka, Moe, Sakatani, Naoya, Suzuki, Hidehiko, Yamada, Manabu, Yoshioka, Kazuo, Sawada, Hirotaka, Hemmi, Ryodo, Kikuchi, Hiroshi, Ogawa, Kazunori, Watanabe, Sei-ichiro, Tanaka, Satoshi, Yoshikawa, Makoto, Tsuda, Yuichi, and Sugita, Seiji

Published
2019
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50. Updated inflight calibration of Hayabusa2's optical navigation camera (ONC) for scientific observations during the cruise phase

Author

Tatsumi, Eri, Kouyama, Toru, Suzuki, Hidehiko, Yamada, Manabu, Sakatani, Naoya, Kameda, Shingo, Yokota, Yasuhiro, Honda, Rie, Morota, Tomokatsu, Moroi, Keiichi, Tanabe, Naoya, Kamiyoshihara, Hiroaki, Ishida, Marika, Yoshioka, Kazuo, Sato, Hiroyuki, Honda, Chikatoshi, Hayakawa, Masahiko, Kitazato, Kohei, Sawada, Hirotaka, and Sugita, Seiji

Published
2019
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