Faculty Profiles - WATANABE, Sei-ichiro

Papers - WATANABE, Sei-ichiro

Division display 181 - 200 of about 240 ／ All the affair displays >>

Evidence for widespread hydrated minerals on asteroid (101955) Bennu Reviewed

Hamilton V. E, Simon A. A, Christensen P. R, Reuter D. C, Clark B. E, Barucci M. A, Bowles N. E, Boynton W. V, Brucato J. R, Cloutis E. A, Connolly H. C. Jr, Hannah K, L. Donaldson, Emery J. P, Enos H. L, Fornasier S, Haberle C. W, Hanna R. D, Howell E. S, Kaplan H. H, Keller L. P, Lantz C, Li J-Y, Lim L. F, McCoy T. J, Merlins F, Nolan M. C, Praet A, Rozitis B, Sandford S. A, Schrader D. L, Thomas C. A, Zou X-D, Lauretta D. S, Highsmith D. E, Small J, Vokrouhlicky D, Brown E, Warren T, Brunet C, Chicoine R. A, Desjardins S, Gaudreau D, Haltigin T, Millington-Veloza S, Rubi A, Aponte J, Gorius N, Lunsford A, Allen B, Grindlay J, Guevel D, Hoak D, Hong J, Bayron J, Golubov O, Sanchez P, Stromberg J, Hirabayashi M, Hartzell C. M, Oliver S, Rascon M, Harch A, Joseph J, Squyres S, Richardson D, McGraw L, Ghent R, Binzel R. P, Al Asad M. M, Johnson C. L, Philpott L, Susorney H. C. M, Ciceri F, Hildebrand A. R, Ibrahim E-M, Breitenfeld L, Glotch T, Rogers A. D, Ferrone S, Campins H, Fernandez Y, Chang W, Cheuvront A, Trang D, Tachibana S, Yurimoto H, Poggiali G, Pajola M, Dotto E, Epifani E. Mazzotta, Crombie M. K, Izawa M. R. M, de Leon J, Licandro J, Garcia J, L. Rizos, Clemett S, Thomas-Keprta K, Van Wal S, Yoshikawa M, Bellerose J, Bhaskaran S, Boyles C, Chesley S. R, Elder C. M, Farnocchia D, Harbison A, Kennedy B, Knight A, Martinez-Vlasoff N, Mastrodemos N, McElrath T, Owen W, Park R, Rush B, Swanson L, Takahashi Y, Velez D, Yetter K, Thayer C, Adam C, Antreasian P, Bauman J, Bryan C, Carcich B, Corvin M, Geeraert J, Hoffman J, Leonard J. M, Lessac-Chenen E, Levine A, McAdams J, McCarthy L, Nelson D, Page B, Pelgrift J, Sahr E, Stakkestad K, Stanbridge D, Wibben D, Williams B, Williams K, Wolff P, Hayne P, Kubitschek D, Deshapriya J. D. P, Fulchignoni M, Hasselmann P, Merlin F, Bierhaus E. B, Billett O, Boggs A, Buck B, Carlson-Kelly S, Cerna J, Chaffin K, Church E, Coltrin M, Daly J, Deguzman A, Dubisher R, Eckart D, Ellis D, Falkenstern P, Fisher A, Fisher M. E, Fleming P, Fortney K, Francis S, Freund S, Gonzales S, Haas P, Hasten A, Hauf D, Hilbert A, Howell D, Jaen F, Jayakody N, Jenkins M, Johnson K, Lefevre M, Ma H, Mario C, Martin K, May C, McGee M, Miller B, Miller C, Miller G, Mirfakhrai A, Muhle E, Norman C, Olds R, Parish C, Ryle M, Schmitzer M, Sherman P, Skeen M, Susak M, Sutter B, Tran Q, Welch C, Witherspoon R, Wood J, Zareski J, Arvizu-Jakubicki M, Asphaug E, Audi E, Ballouz R-L, Bandrowski R, Becker K. J, Becker T. L, Bendall S, Bennett C. A, Bloomenthal H, Blum D, Brodbeck J, Burke K. N, Chojnacki M, Colpo A, Contreras J, Cutts J, d'Aubigny C, Y. Drouet, Dean D, DellaGiustina D. N, Diallo B, Drinnon D, Drozd K, Enos R, Fellows C, Ferro T, Fisher M. R, Fitzgibbon G, Fitzgibbon M, Forelli J, Forrester T, Gal

NATURE ASTRONOMY Vol. 3 ( 4 ) page： 332 - 340 2019.4

Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface Reviewed International coauthorship

Walsh, K.J., Jawin, E.R., Ballouz, R.-L., Barnouin, O.S., Bierhaus, E.B., Connolly, H.C., Molaro, J.L., McCoy, T.J., Delbo’, M., Hartzell, C.M., Pajola, M., Schwartz, S.R., Trang, D., Asphaug, E., Becker, K.J., Beddingfield, C.B., Bennett, C.A., Bottke, W.F., Burke, K.N., Clark, B.C., Daly, M.G., DellaGiustina, D.N., Dworkin, J.P., Elder, C.M., Golish, D.R., Hildebrand, A.R., Malhotra, R., Marshall, J., Michel, P., Nolan, M.C., Perry, M.E., Rizk, B., Ryan, A., Sandford, S.A., Scheeres, D.J., Susorney, H.C.M., Thuillet, F., Lauretta, D.S., Highsmith, D.E., Small, J., Vokrouhlický, D., Bowles, N.E., Brown, E., Donaldson Hanna, K.L., Warren, T., Brunet, C., Chicoine, R.A., Desjardins, S., Gaudreau, D., Haltigin, T., Millington-Veloza, S., Rubi, A., Aponte, J., Gorius, N., Lunsford, A., Allen, B., Grindlay, J., Guevel, D., Hoak, D., Hong, J., Schrader, D.L., Bayron, J., Golubov, O., Sánchez, P., Stromberg, J., Hirabayashi, M., Hartzell, C.M., Oliver, S., Rascon, M., Harch, A., Joseph, J., Squyres, S., Richardson, D., Emery, J.P., McGraw, L., Ghent, R., Binzel, R.P., Al Asad, M.M., Johnson, C.L., Philpott, L., Susorney, H.C.M., Cloutis, E.A., Hanna, R.D., Connolly, H.C., Ciceri, F., Hildebrand, A.R., Ibrahim, E.-M., Breitenfeld, L., Glotch, T., Rogers, A.D., Clark, B.E., Ferrone, S., Thomas, C.A., Campins, H., Fernandez, Y., Chang, W., Cheuvront, A., Trang, D., Tachibana, S., Yurimoto, H., Brucato, J.R., Poggiali, G., Pajola, M., Dotto, E., Epifani, E.M., Crombie, M.K., Lantz, C., Izawa, M.R.M., de Leon, J., Licandro, J., Garcia, J.L.R., Clemett, S., Thomas-Keprta, K., Van wal, S., Yoshikawa, M., Bellerose, J., Bhaskaran, S., Boyles, C., Chesley, S.R., Elder, C.M., Farnocchia, D., Harbison, A., Kennedy, B., Knight, A., Martinez-Vlasoff, N., Mastrodemos, N., McElrath, T., Owen, W., Park, R., Rush, B., Swanson, L., Takahashi, Y., Velez, D., Yetter, K., Thayer, C., Adam, C., Antreasian, P., Bauman, J., Bryan, C., Carcich, B., Corvin, M., Geeraert, J., Hoffman, J., Leonard, J.M., Lessac-Chenen, E., Levine, A., McAdams, J., McCarthy, L., Nelson, D., Page, B., Pelgrift, J., Sahr, E., Stakkestad, K., Stanbridge, D., Wibben, D., Williams, B., Williams, K., Wolff, P., Hayne, P., Kubitschek, D., Barucci, M.A., Deshapriya, J.D.P., Fornasier, S., Fulchignoni, M., Hasselmann, P., Merlin, F., Praet, A., Bierhaus, E.B., Billett, O., Boggs, A., Buck, B., Carlson-Kelly, S., Cerna, J., Chaffin, K., Church, E., Coltrin, M., Daly, J., Deguzman, A., Dubisher, R., Eckart, D., Ellis, D., Falkenstern, P., Fisher, A., Fisher, M.E., Fleming, P., Fortney, K., Francis, S., Freund, S., Gonzales, S., Haas, P., Hasten, A., Hauf, D., Hilbert, A., Howell, D., Jaen, F., Jayakody, N., Jenkins, M., Johnson, K., Lefevre, M., Ma, H., Mario, C., Martin, K., May, C., McGee, M., Miller, B., Miller, C., Miller, G., Mirfakhrai, A., Muhle, E., Norman, C., Olds, R., Parish, C., Ryle, M., Schmitzer, M., Sherman, P., Skeen, M., Susak, M., Sutter, B., Tran, Q., Welch, C., Witherspoon, R., Wood, J., Zareski, J., Arvizu-Jakubicki, M., Asphaug, E., Audi, E., Ballouz, R.-L., Bandrowski, R., Becker, K.J., Becker, T.L., Bendall, S., Bennett, C.A., Bloomenthal, H., Blum, D., Boynton, W.V., Brodbeck, J., Burke, K.N., Chojnacki, M., Colpo, A., Contreras, J., Cutts, J., Drouet d’Aubigny, C.Y., Dean, D., DellaGiustina, D.N., Diallo, B., Drinnon, D., Drozd, K., Enos, H.L., Enos, R., Fellows, C., Ferro, T., Fisher, M.R., Fitzgibbon, G., Fitzgibbon, M., Forelli, J., Forrester, T., Galinsky, I., Garcia, R., Gardner, A., Golish, D.R., Habib, N., Hamara, D., Hammond, D., Hanley, K., Harshman, K., Hergenrother, C.W., Herzog, K., Hill, D., Hoekenga, C., Hooven, S., Howell, E.S., Huettner, E., Janakus, A., Jones, J., Kareta, T.R., Kidd, J., Kingsbury, K., Balram-Knutson, S.S., Koelbel, L., Kreiner, J., Lambert, D., Lauretta, D.S., Lewin, C., Lovelace, B., Loveridge, M., Lujan, M., Maleszewski, C.K., Malhotra, R., Marchese, K., McDonough, E., Mogk, N., Morrison, V., Morton, E., Munoz, R., Nelson, J., Nolan, M.C., Padilla, J., Pennington, R., Polit, A., Ramos, N., Reddy, V., Riehl, M., Rizk, B., Roper, H.L., Salazar, S., Schwartz, S.R., Selznick, S., Shultz, N., Smith, P.H., Stewart, S., Sutton, S., Swindle, T., Tang, Y.H., Westermann, M., Wolner, C.W.V., Worden, D., Zega, T., Zeszut, Z., Bjurstrom, A., Bloomquist, L., Dickinson, C., Keates, E., Liang, J., Nifo, V., Taylor, A., Teti, F., Caplinger, M., Bowles, H., Carter, S., Dickenshied, S., Doerres, D., Fisher, T., Hagee, W., Hill, J., Miner, M., Noss, D., Piacentine, N., Smith, M., Toland, A., Wren, P., Bernacki, M., Munoz, D.P., Watanabe, S., Sandford, S.A., Aqueche, A., Ashman, B., Barker, M., Bartels, A., Berry, K., Bos, B., Burns, R., Calloway, A., Carpenter, R., Castro, N., Cosentino, R., Donaldson, J., Dworkin, J.P., Cook, J.E., Emr, C., Everett, D., Fennell, D., Fleshman, K., Folta, D., Gallagher, D., Garvin, J., Getzandanner, K., Glavin, D., Hull, S., Hyde, K., Ido, H., Ingegneri, A., Jones, N., Kaotira, P., Lim, L.F., Liounis, A., Lorentson, C., Lorenz, D., Lyzhoft, J., Mazarico, E.M., Mink, R., Moore, W., Moreau, M., Mullen, S., Nagy, J., Neumann, G., Nuth, J., Poland, D., Reuter, D.C., Rhoads, L., Rieger, S., Rowlands, D., Sallitt, D., Scroggins, A., Shaw, G., Simon, A.A., Swenson, J., Vasudeva, P., Wasser, M., Zellar, R., Grossman, J., Johnston, G., Morris, M., Wendel, J., Burton, A., Keller, L.P., McNamara, L., Messenger, S., Nakamura-Messenger, K., Nguyen, A., Righter, K., Queen, E., Bellamy, K., Dill, K., Gardner, S., Giuntini, M., Key, B., Kissell, J., Patterson, D., Vaughan, D., Wright, B., Gaskell, R.W., Le Corre, L., Li, J.-Y., Molaro, J.L., Palmer, E.E., Siegler, M.A., Tricarico, P., Weirich, J.R., Zou, X.-D., Ireland, T., Tait, K., Bland, P., Anwar, S., Bojorquez-Murphy, N., Christensen, P.R., Haberle, C.W., Mehall, G., Rios, K., Franchi, I., Rozitis, B., Beddingfield, C.B., Marshall, J., Brack, D.N., French, A.S., McMahon, J.W., Scheeres, D.J., Jawin, E.R., McCoy, T.J., Russell, S., Killgore, M., Bottke, W.F., Hamilton, V.E., Kaplan, H.H., Walsh, K.J., Bandfield, J.L., Clark, B.C., Chodas, M., Lambert, M., Masterson, R.A., Daly, M.G., Freemantle, J., Seabrook, J.A., Barnouin, O.S., Craft, K., Daly, R.T., Ernst, C., Espiritu, R.C., Holdridge, M., Jones, M., Nair, A.H., Nguyen, L., Peachey, J., Perry, M.E., Plescia, J., Roberts, J.H., Steele, R., Turner, R., Backer, J., Edmundson, K., Mapel, J., Milazzo, M., Sides, S., Manzoni, C., May, B., Delbó, M., Libourel, G., Michel, P., Ryan, A., Thuillet, F., Marty, B.

Nature Geoscience Vol. 12 ( 4 ) page： 242 - + 2019.4

The Western Bulge of 162173 Ryugu Formed as a Result of a Rotationally Driven Deformation Process Reviewed International coauthorship

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

Astrophysical Journal Letters Vol. 874 ( 1 ) 2019.3

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

© 2019. The American Astronomical Society. All rights reserved.. 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 the Optical Navigation Camera on board 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 hr. 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 and ∼3.0 hr, providing the cohesive strength ranging between ∼4 and ∼10 Pa.

DOI： 10.3847/2041-8213/ab0e8b

Web of Science

Scopus

The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations Reviewed International coauthorship

Hergenrother C. W, Maleszewski C. K, Nolan M. C, Li J-Y, d'Aubigny C, Y. Drouet, Shelly F. C, Howell E. S, Kareta T. R, Izawa M. R. M, Barucci M. A, Bierhaus E. B, Campins H, Chesley S. R, Clark B. E, Christensen E. J, DellaGiustina D. N, Fornasier S, Golish D. R, Hartzell C. M, Rizk B, Scheeres D. J, Smith P. H, Zou X-D, Lauretta D. S, Highsmith D. E, Small J, Vokrouhlicky D, Bowles N. E, Brown E, Hanna K, L. Donaldson, Warren T, Brunet C, Chicoine R. A, Desjardins S, Gaudreau D, Haltigin T, Millington-Veloza S, Rubi A, Aponte J, Gorius N, Lunsford A, Allen B, Grindlay J, Guevel D, Hoak D, Hong J, Schrader D. L, Bayron J, Golubov O, Sanchez P, Stromberg J, Hirabayashi M, Oliver S, Rascon M, Harch A, Joseph J, Squyres S, Richardson D, Emery J. P, McGraw L, Ghent R, Binzel R. P, Al Asad M. M, Johnson C. L, Philpott L, Susorney H. C. M, Cloutis E. A, Hanna R. D, Connolly H. C. Jr, Ciceri F, Hildebrand A. R, Ibrahim E-M, Breitenfeld L, Glotch T, Rogers A. D, Ferrone S, Thomas C. A, Fernandez Y, Chang W, Cheuvront A, Trang D, Tachibana S, Yurimoto H, Brucato J. R, Poggiali G, Pajola M, Dotto E, Epifani E. Mazzotta, Crombie M. K, Lantz C, de Leon J, Licandro J, Rizos Garcia J. L, Clemett S, Thomas-Keprta K, Van Wal S, Yoshikawa M, Bellerose J, Bhaskaran S, Boyles C, Elder C. M, Farnocchia D, Harbison A, Kennedy B, Knight A, Martinez-Vlasoff N, Mastrodemos N, McElrath T, Owen W, Park R, Rush B, Swanson L, Takahashi Y, Velez D, Yetter K, Thayer C, Adam C, Antreasian P, Bauman J, Bryan C, Carcich B, Corvin M, Geeraert J, Hoffman J, Leonard J. M, Lessac-Chenen E, Levine A, McAdams J, McCarthy L, Nelson D, Page B, Pelgrift J, Sahr E, Stakkestad K, Stanbridge D, Wibben D, Williams B, Williams K, Wolff P, Hayne P, Kubitschek D, Deshapriya J. D. P, Fulchignoni M, Hasselmann P, Merlin F, Praet A, Billett O, Boggs A, Buck B, Carlson-Kelly S, Cerna J, Chaffin K, Church E, Coltrin M, Daly J, Deguzman A, Dubisher R, Eckart D, Ellis D, Falkenstern P, Fisher A, Fisher M. E, Fleming P, Fortney K, Francis S, Freund S, Gonzales S, Haas P, Hasten A, Hauf D, Hilbert A, Howell D, Jaen F, Jayakody N, Jenkins M, Johnson K, Lefevre M, Ma H, Mario C, Martin K, May C, McGee M, Miller B, Miller C, Miller G, Mirfakhrai A, Muhle E, Norman C, Olds R, Parish C, Ryle M, Schmitzer M, Sherman P, Skeen M, Susak M, Sutter B, Tran Q, Welch C, Witherspoon R, Wood J, Zareski J, Arvizu-Jakubicki M, Asphaug E, Audi E, Ballouz R-L, Bandrowski R, Becker K. J, Becker T. L, Bendall S, Bennett C. A, Bloomenthal H, Blum D, Boynton W. V, Brodbeck J, Burke K. N, Chojnacki M, Colpo A, Contreras J, Cutts J, Dean D, Diallo B, Drinnon D, Drozd K, Enos H. L, Enos R, Fellows C, Ferro T, Fisher M. R, Fitzgibbon G, Fitzgibbon M, Forelli J, Forrester T, Galinsky I, Garcia R, Gardner A

NATURE COMMUNICATIONS Vol. 10 2019.3

Hayabusa2-Sample return and kinetic impact mission to near-earth asteroid Ryugu Reviewed

Tsuda Yuichi, Yoshikawa Makoto, Saiki Takanao, Nakazawa Satoru, Watanabe Sei-ichiro

ACTA ASTRONAUTICA Vol. 156 page： 387 - 393 2019.3

High porosity nature of the top-shape C-type asteroid 162173 Ryugu as observed by Hayabusa2

S. Watanabe, M. Hirabayashi, Naru Hirata, Naoyuki Hirata, R. Noguchi, Y. Shimaki, H. Ikeda, E. Tatsumi, M. Yoshikawa, S. Kikuchi, H. Yabuta, T. Nakamura, S. Tachibana, Y. Ishihara, T. Morota, K. Kitazato, N. Sakatani, K. Matsumoto, K. Wada, H. Senshu, C. Honda, T. Michikami, H. Takeuchi, T. Kouyama, R. Honda, S. Kameda, T. Fuse, H. Miyamoto, G. Komatsu, S. Sugita, T. Okada, N. Namiki, M. Arakawa, M. Ishiguro, M. Abe, R. Gaskell, E. Palmer, O. S. Barnouin, P. Michel, A. S. French, J. W. McMahon, D. J. Scheeres, P. A. Abell, Y. Yamamoto, S. Tanaka, K. Shirai, M. Matsuoka, M. Yamada, Y. Yokota, H. Suzuki, K. Yoshioka, Y. Cho, S. Tanaka, N. Nishikawa, T. Sugiyama, H. Kikuchi, R. Hemmi, T. Yamaguchi, N. Ogawa, G. Ono, Y. Mimasu, K. Yoshikawa, T. Takahashi, Y. Takei, A. Fujii, C. Hirose, T. Iwata, M. Hayakawa, S. Hosoda, O. Mori, H. Sawada, T. Shimada, S. Soldini, H. Yano, R. Tsukizaki, M. Ozaki, Y. Iijima, K. Ogawa, M. Fujimoto, T.-M. Ho, A. Moussi, R. Jaumann, J.-P. Bibring, C. Krause, F. Terui, T. Saiki, S. Nakazawa, Y. Tsuda

Proceedings of Lunar and Planetary Science Conference Vol. 50 page： 1265 2019.3

Thermal Imaging of C-Type Near Earth Asteroid 162173 Ryugu by Thermal Imfrared Imager TIR on Hayabusa2

Okada, T, Fukuhara, T, Tanaka, S, Taguchi, M, Arai, T, Sakatani, N, Shimaki, Y, Senshu, H, Ogawa, Y, Demura, H, Suko, K, Kitazato, K, Kouyama, T, Sekiguchi, T, Takita, J, Hasegawa, S, Matsunaga, T, Wada, T, Imamura, T, Helbert, J, Mueller, T. G, Hagermann, A, Biele, J, Grott, M, Hamm, M, Delbo, M, Yamamoto, Y, Hirata, N, Hirata, N, Terui, F, Saiki, T, Nakazawa, S, Yoshikawa, M, Watanabe, S, Tsuda, Y

50th Lunar and Planetary Science Conference Vol. 2132 page： 1325 - 1326 2019.3

The evolution of Ryugu's parent body constrained by Hayabusa2 imaging observations

S. Sugita, R. Honda, T. Morota, S. Kameda, E. Tatsumi, C. Honda, Y. Yokota, M. Yamada, T. Kouyama, N. Sakatani, H. Suzuki, K. Yoshioka, Y. Cho, M. Matsuoka, K. Ogawa, D. Domingue, H. Miyamoto, O. S. Barnouin, P. Michel, C. M. Ernst, T. Hiroi, T. Nakamura, H. Sawada, M. Hayakawa, N. Hirata, N. Hirata, H.Kikuchi, R. Hemmi, T. Michikami, E. Palmer, R. Gaskell, M.Hirabayashi, R. Jaumann, K. Otto, N. Schmitz, S. E. Schröder, G. Komatsu, S. Tanaka, K. Shirai, M. Yoshikawa, S. Watanabe, Y. Tsuda

Proceedings of Lunar and Planetary Science Conference 2019.3

Landing site selection and landing dispersion analysis for the Hayabusa2 mission Reviewed

S. Kikuchi, T. Saiki, F. Terui, Y. Takei, K. Yoshikawa, N. Ogawa, G. Ono, Y. Mimasu, H. Sawada, N. Shibata, T. Morota, N. Hirata, N. Hirata, T. Michikami, C. Honda, Y. Yokota, H. Yabuta, M. Yoshikawa, S. Watanabe, Y. Tsuda

Proceedings of the International Astronautical Congress, IAC Vol. 2019-October 2019

Language：English Publishing type：Research paper (international conference proceedings)

One of the primary operations in the Hayabusa2 mission is touchdown on the asteroid Ryugu, which was successfully performed on February 21st, 2019. Because of the abundance of boulders on the asteroid surface, it was challenging to guarantee a safe and secure landing. To identify a promising landing site and design a feasible landing trajectory even under such a situation, this research develops detailed site selection and dispersion analysis strategies. The dispersion of the landing points is computed by a Monte Carlo simulation. Moreover, the distributions of landing conditions, such as a surface contact angle and a clearance distance, are analyzed, validating the feasibility of the touchdown operation. Consequently, a circular area with a radius of 3 m was selected as a safe landing site, leading to the successful landing.

Scopus

Publisher Correction: Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface (Nature Geoscience, (2019), 10.1038/s41561-019-0326-6) Reviewed International coauthorship

Walsh, K.J., Jawin, E.R., Ballouz, R.-L., Barnouin, O.S., Bierhaus, E.B., Connolly, H.C., Molaro, J.L., McCoy, T.J., Delbo’, M., Hartzell, C.M., Pajola, M., Schwartz, S.R., Trang, D., Asphaug, E., Becker, K.J., Beddingfield, C.B., Bennett, C.A., Bottke, W.F., Burke, K.N., Clark, B.C., Daly, M.G., DellaGiustina, D.N., Dworkin, J.P., Elder, C.M., Golish, D.R., Hildebrand, A.R., Malhotra, R., Marshall, J., Michel, P., Nolan, M.C., Perry, M.E., Rizk, B., Ryan, A., Sandford, S.A., Scheeres, D.J., Susorney, H.C.M., Thuillet, F., Lauretta, D.S., Highsmith, D.E., Small, J., Vokrouhlický, D., Bowles, N.E., Brown, E., Hanna, K.L.D., Warren, T., Brunet, C., Chicoine, R.A., Desjardins, S., Gaudreau, D., Haltigin, T., Millington-Veloza, S., Rubi, A., Aponte, J., Gorius, N., Lunsford, A., Allen, B., Grindlay, J., Guevel, D., Hoak, D., Hong, J., Schrader, D.L., Bayron, J., Golubov, O., Sánchez, P., Stromberg, J., Hirabayashi, M., Hartzell, C.M., Oliver, S., Rascon, M., Harch, A., Joseph, J., Squyres, S., Richardson, D., Emery, J.P., McGraw, L., Ghent, R., Binzel, R.P., Asad, M.M.A., Johnson, C.L., Philpott, L., Susorney, H.C.M., Cloutis, E.A., Hanna, R.D., Connolly, H.C., Ciceri, F., Hildebrand, A.R., Ibrahim, E.-M., Breitenfeld, L., Glotch, T., Rogers, A.D., Clark, B.E., Ferrone, S., Thomas, C.A., Campins, H., Fernandez, Y., Chang, W., Cheuvront, A., Trang, D., Tachibana, S., Yurimoto, H., Brucato, J.R., Poggiali, G., Pajola, M., Dotto, E., Epifani, E.M., Crombie, M.K., Lantz, C., Izawa, M.R.M., de Leon, J., Licandro, J., Garcia, J.L.R., Clemett, S., Thomas-Keprta, K., Van wal, S., Yoshikawa, M., Bellerose, J., Bhaskaran, S., Boyles, C., Chesley, S.R., Elder, C.M., Farnocchia, D., Harbison, A., Kennedy, B., Knight, A., Martinez-Vlasoff, N., Mastrodemos, N., McElrath, T., Owen, W., Park, R., Rush, B., Swanson, L., Takahashi, Y., Velez, D., Yetter, K., Thayer, C., Adam, C., Antreasian, P., Bauman, J., Bryan, C., Carcich, B., Corvin, M., Geeraert, J., Hoffman, J., Leonard, J.M., Lessac-Chenen, E., Levine, A., McAdams, J., McCarthy, L., Nelson, D., Page, B., Pelgrift, J., Sahr, E., Stakkestad, K., Stanbridge, D., Wibben, D., Williams, B., Williams, K., Wolff, P., Hayne, P., Kubitschek, D., Barucci, M.A., Deshapriya, J.D.P., Fornasier, S., Fulchignoni, M., Hasselmann, P., Merlin, F., Praet, A., Bierhaus, E.B., Billett, O., Boggs, A., Buck, B., Carlson-Kelly, S., Cerna, J., Chaffin, K., Church, E., Coltrin, M., Daly, J., Deguzman, A., Dubisher, R., Eckart, D., Ellis, D., Falkenstern, P., Fisher, A., Fisher, M.E., Fleming, P., Fortney, K., Francis, S., Freund, S., Gonzales, S., Haas, P., Hasten, A., Hauf, D., Hilbert, A., Howell, D., Jaen, F., Jayakody, N., Jenkins, M., Johnson, K., Lefevre, M., Ma, H., Mario, C., Martin, K., May, C., McGee, M., Miller, B., Miller, C., Miller, G., Mirfakhrai, A., Muhle, E., Norman, C., Olds, R., Parish, C., Ryle, M., Schmitzer, M., Sherman, P., Skeen, M., Susak, M., Sutter, B., Tran, Q., Welch, C., Witherspoon, R., Wood, J., Zareski, J., Arvizu-Jakubicki, M., Asphaug, E., Audi, E., Ballouz, R.-L., Bandrowski, R., Becker, K.J., Becker, T.L., Bendall, S., Bennett, C.A., Bloomenthal, H., Blum, D., Boynton, W.V., Brodbeck, J., Burke, K.N., Chojnacki, M., Colpo, A., Contreras, J., Cutts, J., Drouet d’Aubigny, C.Y., Dean, D., DellaGiustina, D.N., Diallo, B., Drinnon, D., Drozd, K., Enos, H.L., Enos, R., Fellows, C., Ferro, T., Fisher, M.R., Fitzgibbon, G., Fitzgibbon, M., Forelli, J., Forrester, T., Galinsky, I., Garcia, R., Gardner, A., Golish, D.R., Habib, N., Hamara, D., Hammond, D., Hanley, K., Harshman, K., Hergenrother, C.W., Herzog, K., Hill, D., Hoekenga, C., Hooven, S., Howell, E.S., Huettner, E., Janakus, A., Jones, J., Kareta, T.R., Kidd, J., Kingsbury, K., Balram-Knutson, S.S., Koelbel, L., Kreiner, J., Lambert, D., Lauretta, D.S., Lewin, C., Lovelace, B., Loveridge, M., Lujan, M., Maleszewski, C.K., Malhotra, R., Marchese, K., McDonough, E., Mogk, N., Morrison, V., Morton, E., Munoz, R., Nelson, J., Nolan, M.C., Padilla, J., Pennington, R., Polit, A., Ramos, N., Reddy, V., Riehl, M., Rizk, B., Roper, H.L., Salazar, S., Schwartz, S.R., Selznick, S., Shultz, N., Smith, P.H., Stewart, S., Sutton, S., Swindle, T., Tang, Y.H., Westermann, M., Wolner, C.W.V., Worden, D., Zega, T., Zeszut, Z., Bjurstrom, A., Bloomquist, L., Dickinson, C., Keates, E., Liang, J., Nifo, V., Taylor, A., Teti, F., Caplinger, M., Bowles, H., Carter, S., Dickenshied, S., Doerres, D., Fisher, T., Hagee, W., Hill, J., Miner, M., Noss, D., Piacentine, N., Smith, M., Toland, A., Wren, P., Bernacki, M., Munoz, D.P., Watanabe, S., Sandford, S.A., Aqueche, A., Ashman, B., Barker, M., Bartels, A., Berry, K., Bos, B., Burns, R., Calloway, A., Carpenter, R., Castro, N., Cosentino, R., Donaldson, J., Dworkin, J.P., Cook, J.E., Emr, C., Everett, D., Fennell, D., Fleshman, K., Folta, D., Gallagher, D., Garvin, J., Getzandanner, K., Glavin, D., Hull, S., Hyde, K., Ido, H., Ingegneri, A., Jones, N., Kaotira, P., Lim, L.F., Liounis, A., Lorentson, C., Lorenz, D., Lyzhoft, J., Mazarico, E.M., Mink, R., Moore, W., Moreau, M., Mullen, S., Nagy, J., Neumann, G., Nuth, J., Poland, D., Reuter, D.C., Rhoads, L., Rieger, S., Rowlands, D., Sallitt, D., Scroggins, A., Shaw, G., Simon, A.A., Swenson, J., Vasudeva, P., Wasser, M., Zellar, R., Grossman, J., Johnston, G., Morris, M., Wendel, J., Burton, A., Keller, L.P., McNamara, L., Messenger, S., Nakamura-Messenger, K., Nguyen, A., Righter, K., Queen, E., Bellamy, K., Dill, K., Gardner, S., Giuntini, M., Key, B., Kissell, J., Patterson, D., Vaughan, D., Wright, B., Gaskell, R.W., Le Corre, L., Li, J.-Y., Molaro, J.L., Palmer, E.E., Siegler, M.A., Tricarico, P., Weirich, J.R., Zou, X.-D., Ireland, T., Tait, K., Bland, P., Anwar, S., Bojorquez-Murphy, N., Christensen, P.R., Haberle, C.W., Mehall, G., Rios, K., Franchi, I., Rozitis, B., Beddingfield, C.B., Marshall, J., Brack, D.N., French, A.S., McMahon, J.W., Scheeres, D.J., Jawin, E.R., McCoy, T.J., Russell, S., Killgore, M., Bottke, W.F., Hamilton, V.E., Kaplan, H.H., Walsh, K.J., Bandfield, J.L., Clark, B.C., Chodas, M., Lambert, M., Masterson, R.A., Daly, M.G., Freemantle, J., Seabrook, J.A., Barnouin, O.S., Craft, K., Daly, R.T., Ernst, C., Espiritu, R.C., Holdridge, M., Jones, M., Nair, A.H., Nguyen, L., Peachey, J., Perry, M.E., Plescia, J., Roberts, J.H., Steele, R., Turner, R., Backer, J., Edmundson, K., Mapel, J., Milazzo, M., Sides, S., Manzoni, C., May, B., Delbó, M., Libourel, G., Michel, P., Ryan, A., Thuillet, F., Marty, B.

Nature Geoscience Vol. 12 ( 5 ) page： 399 - 399 2019

Language：English Publishing type：Research paper (scientific journal)

© 2019, Springer Nature Limited. In the version of this Article originally published, in the sentence “There are three identified boulders with long axes exceeding 40 m and more than 200 boulders larger than 10 m2”, the term “10 m2” should have been “10 m (ref.2)”. This has now been corrected.

DOI： 10.1038/s41561-019-0360-4

Scopus

Hayabuas2 mission status: Landing, roving and cratering on asteroid Ryugu Reviewed International journal

Yuichi Tsuda, Takanao Saiki, Fuyuto Terui, Satoru Nakazawa, Makoto Yoshikawa, Sei-Ichiro Watanabe

Proceedings of the International Astronautical Congress, IAC Vol. 2019- 2019

Language：English Publishing type：Research paper (international conference proceedings) Publisher：International Astronautical Federation, IAF

Hayabusa2 arrived at the C-type asteroid Ryugu in June 2018. During one and a half year of the Ryugu-proximity operation, we succeeded in two rovers landing, one lander landing, two spacecraft touchdown/sample collection, one kinetic impact operation and two tiny reflective balls and one rover orbiting. Among the two successful touchdowns, the second one succeeded in collecting subsurface material exposed by the kinetic impact operation. This paper describes the asteroid proximity operation activity of the Hayabuas2 mission, and gives an overview of the achievements done so far. Some important engineering and scientific activities, which have been done in synchronous with the spacecraft operations to tackle with unexpected Ryugu environment, are also described.

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Cruise status of Hayabusa2: Round trip mission to asteroid 162173 Ryugu Reviewed

Yuichi Tsuda, Sei-ichiro Watanabe, Takanao Saiki, Makoto Yoshikawa, Satoru Nakazawa

ACTA ASTRONAUTICA Vol. 136 page： 176 - 181 2017.7

Language：English Publishing type：Research paper (scientific journal) Publisher：PERGAMON-ELSEVIER SCIENCE LTD

The Japan Aerospace Exploration Agency launched an asteroid sample return spacecraft "Hayabusa2" on December 3, 2014 by the Japanese H2A launch vehicle. Hayabusa2 aims at the round trip mission to the asteroid 162173 Ryugu. Hayabusa2 successfully conducted the Earth gravity assist on December 3, 2015, and now the spacecraft is flying toward Ryugu with the microwave discharge ion engine as the means of propulsion. As of September 2016, 1346 h of the ion engine operation has been achieved as planned. Three touch downs/sample collections, one kinetic impact/crater generation, four surface rovers deployment and many other in-situ observations are planned in the asteroid proximity phase. The operation team will perform extensive operation practice/rehearsal using a hardware-in-the-loop simulator in the year 2017 to be ready for the asteroid arrival in the summer 2018.

DOI： 10.1016/j.actaastro.2017.03.015

Web of Science

The Camera of the MASCOT Asteroid Lander on Board Hayabusa 2 Reviewed International coauthorship International journal

R. Jaumann, N. Schmitz, A. Koncz, H. Michaelis, S. E. Schroeder, S. Mottola, F. Trauthan, H. Hoffmann, T. Roatsch, D. Jobs, J. Kachlicki, B. Pforte, R. Terzer, M. Tschentscher, S. Weisse, U. Mueller, L. Perez-Prieto, B. Broll, A. Kruselburger, T. -M. Ho, J. Biele, S. Ulamec, C. Krause, M. Grott, J. -P. Bibring, S. Watanabe, S. Sugita, T. Okada, M. Yoshikawa, H. Yabuta

SPACE SCIENCE REVIEWS Vol. 208 ( 1-4 ) page： 375 - 400 2017.7

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

The MASCOT Camera (MasCam) is part of the Mobile Asteroid Surface Scout (MASCOT) lander's science payload. MASCOT has been launched to asteroid (162173) Ryugu onboard JAXA's Hayabusa 2 asteroid sample return mission on Dec 3rd, 2014. It is scheduled to arrive at Ryugu in 2018, and return samples to Earth by 2020. MasCam was designed and built by DLR's Institute of Planetary Research, together with Airbus-DS Germany. The scientific goals of the MasCam investigation are to provide ground truth for the orbiter's remote sensing observations, provide context for measurements by the other lander instruments (radiometer, spectrometer and magnetometer), the orbiter sampling experiment, and characterize the geological context, compositional variations and physical properties of the surface (e.g. rock and regolith particle size distributions). During daytime, clear filter images will be acquired. During night, illumination of the dark surface is performed by an LED array, equipped with 4 x 36 monochromatic light-emitting diodes (LEDs) working in four spectral bands. Color imaging will allow the identification of spectrally distinct surface units. Continued imaging during the surface mission phase and the acquisition of image series at different sun angles over the course of an asteroid day will contribute to the physical characterization of the surface and also allow the investigation of time-dependent processes and to determine the photometric properties of the regolith. The MasCam observations, combined with the MASCOT hyperspectral microscope (MMEGA) and radiometer (MARA) thermal observations, will cover a wide range of observational scales and serve as a strong tie point between Hayabusa 2's remote-sensing scales (10(3)-10(-3) m) and sample scales (10(-3)-10(-6) m). The descent sequence and the close-up images will reveal the surface features over a broad range of scales, allowing an assessment of the surface's diversity and close the gap between the orbital observations and those made by the in-situ measurements. The MasCam is mounted inside the lander slightly tilted, such that the center of its 54.8 degrees square field-of-view is directed towards the surface at an angle of 22 degrees with respect to the surface plane. This is to ensure that both the surface close to the lander and the horizon are observable. The camera optics is designed according to the Scheimpflug principle, thus that the entire scene along the camera's depth of field (150 mm to infinity) is in focus. The camera utilizes a 1024 x 1024 pixel CMOS sensor sensitive in the 400-1000 nm wavelength range, peaking at 600-700 nm. Together with the f-16 optics, this yields a nominal ground resolution of 150 micron/px at 150 mm distance (diffraction limited). The camera flight model has undergone standard radiometric and geometric calibration both at the component and system (lander) level. MasCam relies on the use of wavelet compression to maximize data return within stringent mission downlink limits. All calibration and flight data products will be generated and archived in the Planetary Data System in PDS image format.

DOI： 10.1007/s11214-016-0263-2

Web of Science

Scopus

NIRS3: The Near Infrared Spectrometer on Hayabusa2 Reviewed International coauthorship

Iwata Takahiro, Kitazato Kohei, Abe Masanao, Ohtake Makiko, Arai Takehiko, Arai Tomoko, Hirata Naru, Hiroi Takahiro, Honda Chikatoshi, Imae Naoya, Komatsu Mutsumi, Matsunaga Tsuneo, Matsuoka Moe, Matsuura Shuji, Nakamura Tomoki, Nakato Aiko, Nakauchi Yusuke, Osawa Takahito, Senshu Hiroki, Takagi Yasuhiko, Tsumura Kohji, Takato Naruhisa, Watanabe Sei-ichiro, Barucci Maria Antonietta, Palomba Ernesto, Ozaki Masanobu

SPACE SCIENCE REVIEWS Vol. 208 ( 1-4 ) page： 317 - 337 2017.7

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

NIRS3: The Near Infrared Spectrometer is installed on the Hayabusa2 spacecraft to observe the target C-type asteroid 162173 Ryugu at near infrared wavelengths of 1.8 to 3.2 mu m. It aims to obtain reflectance spectra in order to detect absorption bands of hydrated and hydroxide minerals in the 3 mu m-band. We adopted a linear-image sensor with indium arsenide (InAs) photo diodes and a cooling system with a passive radiator to achieve an optics temperature of 188 K (-85 degrees C), which enables to retaining sufficient sensitivity and noise level in the 3 mu m wavelength region. We conducted ground performance tests for the NIRS3 flight model (FM) to confirm its baseline specifications. The results imply that the properties such as the signal-to-noise ratio (SNR) conform to scientific requirements to determine the degree of aqueous alteration, such as CM or CI chondrite, and the stage of thermal metamorphism on the asteroid surface.

DOI： 10.1007/s11214-017-0341-0

Web of Science

Mascot - Preparations for its landing in 2018: A status update from ground and space one year ahead of the landing on ryugu

Christian Ziach, Volodymyr Baturkin, Christian Grimm, Jan Thimo Grundmann, Tra Mi Ho, Caroline Lange, Kaname Sasaki, Nawarat Termtanasombat, Norbert Toth, Elisabet Wejmo, Maximilian Maier, Josef Reill, Hans Jürgen Sedlmayr, Friederike Wolff, Michael Lange, Olaf Mierheim, Jens Biele, Barbara Cozzoni, Cinzia Fantinati, Koen Geurts, Kagan Kayal, Christian Krause, Oliver Küchemann, Michael Maibaum, Stephan Ulamec, Matthias Grott, Ralf Jaumann, Céline Cénac-Morthe, Muriel Deleuze, Clément Dudal, David Granena, Laurence Lorda, Aurélie Moussi, Jean Pierre Bibring, David Hercik, Hans Ulrich Auster, Yuya Mimasu, Tatsuaki Okada, Takanao Saiki, Sathoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Yamaguchi, Tetsuo Yoshimitsu, Seiichiro Watanabe

Proceedings of the International Astronautical Congress, IAC Vol. 5 page： 2897 - 2904 2017

Language：English Publishing type：Research paper (international conference proceedings)

© Copyright 2017 by the International Astronautical Federation (IAF). All rights reserved. Launched in December 2014 the Japanese spacecraft Hayabusa2 (HY2) and its small passenger MASCOT (Mobile Asteroid surface SCOuT) have meanwhile successfully performed more than half of their 4-year-long voyage to reach their target body, asteroid (162173) Ryugu, formerly referred to as 1999 JU3. While Hayabusa2 is aiming to characterize Ryugu on a global scale and to return samples to Earth, MASCOT's mission is to land on the surface, perform in-situ investigations and thus provide ground truth and context information for the overall Hayabusa2 science activities. The lander was jointly developed by the German Aerospace Centre (DLR) and the Centre National d'Etudes Spatiales (CNES). It is equipped with a sensor suite of four scientific instruments: a hyperspectral IR spectrometer (MicrOmega, IAS Paris), a camera (MasCam, DLR Berlin), a radiometer (MARA, DLR Berlin) and a magnetometer (MasMag, TU Braunschweig) to investigate Ryugu's surface structure, composition and physical properties including its thermal behaviour and magnetization. The planned on surface sequence of measurements will be repeated in a different site after MASCOT's relocation on the asteroid surface. Therefore a mobility subsystem was developed to make MASCOT jump due to applied angular momentum of an eccentric rotating mass inside the system. Since the characteristics of Ryugu such as the exact orientation of the rotation axis, the thermal conditions, shape and surface structure will be known only after arrival of Hayabusa2 in July 2018 there will be only a few weeks available to select a landing site and refine the specific MASCOT mission parameters according to the conditions found, before the landing can take place, in October 2018. MASCOT's on-asteroid lifetime is limited by the capacity of its primary battery which is the main driver to make maximum use of the given time. In order to prepare MASCOT's operation within these constraints, both, space and ground systems have to be well prepared and descent and on-asteroid phases need to be rigorously planned and tested. This paper will summarize the already performed and planned in-flight activities such as health checks, calibration activities, data transfer tests, and will report on MASCOTs overall health state. Beyond that, all on-ground activities such as the landing site selection process, the verification of operational timelines, planning and training aspects will be outlined.

Scopus

Phoenix "Hayabusa": A tale of the future (13) —Landing site selection training of Hayabusa2 Mission—

Ishihara Yoshiaki, Kitazato Kohei, Matsumoto Koji, Yabuta Hikaru, Watanabe Sei-ichiro, Tanaka Satoshi, Yamaguchi Tomohiro, Miura Akira, Yamamoto Yukio, Hirata Naru, Morota Tomokatsu, Sakatani Naoya

Planetary People - The Japanese Society for Planetary Sciences Vol. 26 ( 4 ) page： 139 - 143 2017

Flight status of robotic asteroid sample return mission Hayabusa2 Reviewed

Tsuda, Y., S. Nakazawa, K. Kushiki, M. Yoshikawa, H. Kuninaka, S. Watanabe

Acta Astronautica Vol. 127 page： 702 - 709 2016

Hayabusa-2: Scientific importance of samples returned from near-Earth C-type asteroid 1999 JU3 Invited Reviewed

S. Tachibana, M. Abe, M. Arakawa, M. Fujimoto, Y. Iijima, M. Ishiguro, K. Kitazato, N. Kobayashi, N. Namiki, T. Okada, R. Okazaki, H. Sawada, S. Sugita, Y. Takano, S. Tanaka, S. Watanabe, M. Yoshikawa, H. Kuninaka, the Hayabusa2 project team

Geochemical Journal Vol. 48 ( 6 ) page： 571 - 587 2014.12

Visible-wavelength spectroscopy of subkilometer-sized near-Earth asteroids with a low delta-v Reviewed

D. Kuroda, M. Ishiguro, N. Takato, S. Hasegawa, M. Abe, Y. Tsuda, S. Sugita, F. Usui, T. Hattori, I. Iwata, M. Imanishi, H. Terada, Y-J. Choi, S. Watanabe, M. Yoshikawa

Publications of the Astronomical Society of Japan Vol. 66 ( 3 ) page： #51 2014.6

Hayabusa2 - The Next Asteroid Sample Return Mission of Japan Reviewed

Makoto Yoshikawa, Sei-ichiro Watanabe, Yuichi Tsuda, Hitoshi Kuninaka, Hayabusa2 Project Team

Transactions of JSASS Space Technology Japan Vol. 12 ( 29 ) page： Tk_29-Tk_33 2014

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