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Naoyuki HIRATA

 Assistant Professor
 Department of Planetology
 Graduate School of Science
 Faculty of Science




Research Interests:

  My research focuses on the geology of the icy satellites. I am interested in combining image data obtained by spacecraft and theoretical works such as laboratory experiment and numerical numerical simulation.


Recent Publications: 

  • 1. R. Ikeya and N. Hirata (2021), Ejecta emplacement as the possible origin of Ryugu's equatorial ridge, Icarus 367, 114590
  • 2. N. Hirata and R. Ikeya (2021), Ejecta distribution from impact craters on Ryugu: Possible origin of the bluer units, Icarus 364, 114474
  • 3. N. Hirata et al., (2021), Rotational effect as the possible cause of the east-west asymmetric crater rims on Ryugu observed by LIDAR data, Icarus 354,114073.
  • 4. N. Hirata, Ryu Suetsugu, Keiji Ohtsuki, (2020), A global system of furrows on Ganymede indicative of their creation in a single impact event, Icarus 352, 113941.
  • 5. N. Hirata et al. (2020), The spatial ditribution of craters on Ryugu, Icarus 338, 113527, pp. 1-6.
  • 6. R. Noguchi, N. Hirata, et al. (2021), Crater depth-to-diameter ratios on asteroid 162173 Ryugu, Icarus 354, 114016.
  • 7. K. Ohtsuki, H. Kawamura, Naoyuki Hirata, H. Daisaka, H. Kimura (2020), Size of the smallest particles in Saturn's rings, Icarus 344, 113346, pp. 1-11.
  • 8. S. Watanabe, M. Hirabayashi, Naru Hirata, Naoyuki Hirata et al. (2019), Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu - A spinning top–shaped rubble pile, Science 364, Issue 6437, pp. 268-272.
  • 9. L. Xu, Naoyuki Hirata, H. Miyamoto (2019), Spatial distribution of ray craters on Callisto: Implications for ray retention and impactor sources on Jovian satellites, Journal of Geophysical Research Planets 124, pp. 1717-1727.
  • 10. L. Xu, N. Hirata, and H. Miyamoto (2017), Ray craters on Ganymede: Implications for cratering apex-antapex asymmetry and surface modification processes, Icarus, 295, pp. 140-148. 11. Hirata, N. (2017), Spatial distribution of impact craters on Deimos, Icarus 288(15), pp. 69-77.
  • 12. Hirata, N. (2016),Timing of the faulting on the Wispy Terrain of Dione based on stratigraphic relationships with impact craters, Journal of Geophysical Research Planets 121(11), pp. 2325-2335
  • 13. Hirata, N. (2016), Differential impact cratering of Saturn’s satellites by heliocentric impactors, Journal of Geophysical Research Planets 121(2), pp. 111-117.
  • 14. Hirata, N. and Miyamoto, H. (2016), Rayed craters on Dione: Implication for the dominant surface alteration process, Icarus 274, pp. 116–121.
  • 15. Hirata, N., Miyamoto, H., and A. P. Showman (2014), Particle deposition on the saturnian satellites from ephemeral cryovolcanism on Enceladus, Geophysical Research Letters 41(12), pp. 4135–4141.
  • 16. Hirata, N. and H. Miyamoto (2012), Dust levitation as a major resurfacing process on the surface of a saturnian icy satellite, Atlas, Icarus 220(1), pp. 106-11.
  • 17. S. Kikuchi, N. Ogawa, O. Mori, T. Saiki, Y. Takei, F. Terui, G. Ono, Y. Mimasu, K. Yoshikawa, S.V. Wal, H. Takeuchi, H. Ikeda, A. Fujii, Y. Takao, T. Kusumoto, N. Hirata, Naoyuki Hirata, et al. (2021), Ballistic deployment of the Hayabusa2 artificial landmarks in the microgravity environment of Ryugu, Icarus 358, 114220.
  • 18. E. Tatsumi, C. Sugimoto, L. Riu , S. Sugita, T. Nakamura, T. Hiroi, T. Morota, M. Popescu, T. Michikami, K. Kitazato, M. Matsuoka, S. Kameda, R. Honda, M. Yamada, N. Sakatani, T. Kouyama, Y. Yokota , C. Honda , H. Suzuki , Y. Cho , K. Ogawa, M. Hayakawa, H. Sawada, K. Yoshioka, C. Pilorget, M. Ishida, D. Domingue, Naoyuki Hirata, et al. (2020), Collisional history of Ryugu’s parent body from bright surface boulders, Nature Astronomy in press.
  • 19. T. Morota, S. Sugita, Y. Cho, M. Kanamaru, E. Tatsumi, N. Sakatani, R. Honda, N. Hirata, H. Kikuchi, M. Yamada, Y. Yokota, S. Kameda, M. Matsuoka, H. Sawada, C. Honda, T. Kouyama, K. Ogawa, H. Suzuki, K. Yoshioka, M. Hayakawa, N. Hirata, et al. (2020), Sample collection from asteroid (162173) Ryugu by Hayabusa2: Implications for surface evolution, Science 368, Issue 6491, pp. 654-659.
  • 20. Matsumoto, K., Noda, H., Ishihara, Y., Senshu, H., Yamamoto, K., Hirata, N., Hirata, N., Namiki, N., Otsubo, T., Higuchi, A., Watanabe, S.-I., Ikeda, H., Mizuno, T., Yamada, R., Araki, H., Abe, S., Yoshida, F., Sasaki, S., Oshigami, S., Tsuruta, S., Asari, K., Shizugami, M., Yamamoto, Y., Ogawa, N., Kikuchi, S., Saiki, T., Tsuda, Y., Yoshikawa, M., Tanaka, S., Terui, F., Nakazawa, S., Yamaguchi, T., Takei, Y., Takeuchi, H., Okada, T., Yamada, M., Shimaki, Y., Shirai, K., Ogawa, K., Iijima, Y.-I. (2020), Improving Hayabusa2 trajectory by combining LIDAR data and a shape model, Icarus 338, 113574, pp. 1-8.
  • 21. Okada, T., Fukuhara, T., Tanaka, S., Taguchi, M., Arai, T., Senshu, H., Sakatani, N., Shimaki, Y., Demura, H., Ogawa, Y., Suko, K., Sekiguchi, T., Kouyama, T., Takita, J., Matsunaga, T., Imamura, T., Wada, T., Hasegawa, S., Helbert, J., Müller, T.G., Hagermann, A., Biele, J., Grott, M., Hamm, M., Delbo, M., Hirata, N., Hirata, N.,et al. (2020), Highly porous nature of a primitive asteroid revealed by thermal imaging, Nature 579, Issue 7800, pp. 518-522.
  • 22. Arakawa, M., Saiki, T., Wada, K., Ogawa, K., Kadono, T., Shirai, K., Sawada, H., Ishibashi, K., Honda, R., Sakatani, N., Iijima, Y., Okamoto, C., Yano, H., Takagi, Y., Hayakawa, M., Michel, P., Jutzi, M., Shimaki, Y., Kimura, S., Mimasu, Y., Toda, T., Imamura, H., Nakazawa, S., Hayakawa, H., Sugita, S., Morota, T., Kameda, S., Tatsumi, E., Cho, Y., Yoshioka, K., Yokota, Y., Matsuoka, M., Yamada, M., Kouyama, T., Honda, C., Tsuda, Y., Watanabe, S., Yoshikawa, M., Tanaka, S., Terui, F., Kikuchi, S., Yamaguchi, T., Ogawa, N., Ono, G., Yoshikawa, K., Takahashi, T., Takei, Y., Fujii, A., Takeuchi, H., Yamamoto, Y., Okada, T., Hirose, C., Hosoda, S., Mori, O., Shimada, T., Soldini, S., Tsukizaki, R., Iwata, T., Ozaki, M., Abe, M., Namiki, N., Kitazato, K., Tachibana, S., Ikeda, H., Hirata, N., Hirata, N., Noguchi, R., Miura, A. (2020), An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime, Science 368, Issue 6486, pp. 67-71.
  • 23. Barucci, M.A, Hasselmann, P.H., Fulchignoni, M, Honda, R., Yokota, Y., Sugita, S., Kitazato, K., Deshapriya, J.D.P., Perna, D., Tatsumi, E., Domingue, D., Morota, T., Kameda, S., Iwata, T., Abe, M., Ohtake, M., Matsuura, S., Matsuoka, M., Hiroi, T., Nakamura, T., Kouyama, T., Suzuki, H., Yamada, M., Sakatani, N., Honda, C., Ogawa, K., Hayakawa, M., Yoshioka, K., Cho, Y., Sawada, H., Takir, D., Vilas, F., Naru Hirata, Naoyuki Hirata, Tanaka, S., Yamamoto, Y., Yoshikawa, M., Watanabe, S., Tsuda, Y. (2019), Multivariable statistical analysis of spectrophotometry and spectra of (162173) Ryugu as observed by JAXA Hayabusa2 mission, Astronomy and Astrophysics 629, A13, pp. 1-10.
  • 24. T. Michikami, C. Honda, H. Miyamoto, M. Hirabayashi, A. Hagermann, T. Irie, K. Nomura, C. M. Ernst, M. Kawamura, K. Sugimoto, E. Tatsumi, T. Morota, N. Hirata, T. Noguchi, Y. Cho, S. Kameda, T. Kouyama, Y. Yokota, R. Noguchi, M. Hayakawa, Naoyuki Hirata et al.(2019), Boulder size and shape distributions on asteroid Ryugu, Icarus 331, pp. 179-191
  • 25. K. Kitazato, R. E. Milliken, T. Iwata, M. Abe, M. Ohtake, S. Matsuura, T. Arai, Y. Nakauchi, T. Nakamura, M. Matsuoka, H. Senshu, Naru Hirata, T. Hiroi, C. Pilorget, R. Brunetto, F. Poulet, L. Riu, J.-P. Bibring, D. Takir, D. L. Domingue, F. Vilas, M. A. Barucci, D. Perna, E. Palomba, A. Galiano, K. Tsumura, T. Osawa, M. Komatsu, A. Nakato, T. Arai, N. Takato, T. Matsunaga, Y. Takagi, K. Matsumoto, T. Kouyama, Y. Yokota, E. Tatsumi, N. Sakatani, Y. Yamamoto, T. Okada, S. Sugita, R. Honda, T. Morota, S. Kameda, H. Sawada, C. Honda, M. Yamada, H. Suzuki, K. Yoshioka, M. Hayakawa, K. Ogawa, Y. Cho, K. Shirai, Y. Shimaki, N. Hirata et al. (2019), The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy, Science, 364, Issue 6437, pp. 272-275.
  • 26. M. Hirabayashi, E. Tatsumi, H. Miyamoto, G. Komatsu, S. Sugita, S. Watanabe, D. J. Scheeres, O. S. Barnouin, P. Michel, C. Honda, T. Michikami, Y. Cho, T. Morota, N. Hirata, Naoyuki Hirata et al. (2019), The western bulge of 162173 Ryugu formed as a result of a recent deformation process, Astrophysical Journal Letters 874, Number 1, pp. 1-6.
  • 27. O. S. Barnouin, M. G. Daly, E. E. Palmer, R. W. Gaskell, J. R. Weirich, C. L. Johnson, M. M. Al Asad, J. H. Roberts, M. E. Perry, H. C. M. Susorney, R. T. Daly, E. B. Bierhaus, J. A. Seabrook, R. C. Espiritu, A. H. Nair, L. Nguyen, G. A. Neumann, C. M. Ernst, W. V. Boynton, M. C. Nolan, C. D. Adam, M. C. Moreau, B. Rizk, C. Y. Drouet D’Aubigny, E. R. Jawin, K. J. Walsh, P. Michel, S. R. Schwartz, R.-L. Ballouz, E. M. Mazarico, D. J. Scheeres, J. W. McMahon, W. F. Bottke, S. Sugita, Naru Hirata, Naoyuki Hirata (2019), Shape of (101955) Bennu indicative of a rubble pile with internal stiffness, Nature Geoscience 12, pp. 247–252.
  • 28. S. Sugita, R. Honda, T. Morota, S. Kameda, H. Sawada, E. Tatsumi, M. Yamada, C. Honda, Y. Yokota, T. Kouyama, N. Sakatani, K. Ogawa, H. Suzuki, T. Okada, N. Namiki, S. Tanaka, Y. Iijima, K. Yoshioka, M. Hayakawa, Y. Cho, M. Matsuoka, Naru Hirata, Naoyuki Hirata et al. (2019), The geomorphology, color, and thermal properties of Ryugu: Implications for parent-body processes, Science 364, Issue 6437, eaaw0422, pp. 1-11.


  • Academic Associations: 

Department of Planetology, Graduate School of Science, Kobe University

ADDRESS
1-1, Rokkodai-cho, Nada-ku, Kobe, Hyogo, Japan, 657-8501

TEL: (+81)-78-803-6483
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