Showing papers by "Paul A. Abell published in 2019"
Nagoya University1, Japan Aerospace Exploration Agency2, Auburn University3, University of Aizu4, Kobe University5, University of Tokyo6, Graduate University for Advanced Studies7, Hiroshima University8, Tohoku University9, Chiba Institute of Technology10, Kindai University11, National Institute of Advanced Industrial Science and Technology12, Kōchi University13, Rikkyo University14, National Institute of Information and Communications Technology15, Seoul National University16, Planetary Science Institute17, Johns Hopkins University Applied Physics Laboratory18, Centre national de la recherche scientifique19, University of Colorado Boulder20, Meiji University21, German Aerospace Center22, Centre National D'Etudes Spatiales23
TL;DR: The Hayabusa2 spacecraft measured the mass, size, shape, density, and spin rate of asteroid Ryugu, showing that it is a porous rubble pile, and observations of Ryugu's shape, mass, and geomorphology suggest that Ryugu was reshaped by centrifugally induced deformation during a period of rapid rotation.
Abstract: The Hayabusa2 spacecraft arrived at the near-Earth carbonaceous asteroid 162173 Ryugu in 2018. We present Hayabusa2 observations of Ryugu’s shape, mass, and geomorphology. Ryugu has an oblate “spinning top” shape, with a prominent circular equatorial ridge. Its bulk density, 1.19 ± 0.02 grams per cubic centimeter, indicates a high-porosity (>50%) interior. Large surface boulders suggest a rubble-pile structure. Surface slope analysis shows Ryugu’s shape may have been produced from having once spun at twice the current rate. Coupled with the observed global material homogeneity, this suggests that Ryugu was reshaped by centrifugally induced deformation during a period of rapid rotation. From these remote-sensing investigations, we identified a suitable sample collection site on the equatorial ridge.
402 citations
Chiba Institute of Technology1, University of Tokyo2, Kōchi University3, Nagoya University4, Rikkyo University5, Japan Aerospace Exploration Agency6, University of Aizu7, National Institute of Advanced Industrial Science and Technology8, Kobe University9, Meiji University10, Graduate University for Advanced Studies11, Planetary Science Institute12, Auburn University13, Tohoku University14, Brown University15, Kindai University16, Centre national de la recherche scientifique17, University of Arizona18, Johns Hopkins University Applied Physics Laboratory19, German Aerospace Center20, Hokkaido University of Education21, Max Planck Society22, University of Stirling23, Nihon University24, Osaka University25, Hitotsubashi University26, Hiroshima University27, Seoul National University28, Paris Diderot University29
TL;DR: Spectral observations and a principal components analysis suggest that Ryugu originates from the Eulalia or Polana asteroid family in the inner main belt, possibly via more than one generation of parent bodies.
Abstract: Additional co-authors: N Namiki, S Tanaka, Y Iijima, K Yoshioka, M Hayakawa, Y Cho, M Matsuoka, N Hirata, N Hirata, H Miyamoto, D Domingue, M Hirabayashi, T Nakamura, T Hiroi, T Michikami, P Michel, R-L Ballouz, O S Barnouin, C M Ernst, S E Schroder, H Kikuchi, R Hemmi, G Komatsu, T Fukuhara, M Taguchi, T Arai, H Senshu, H Demura, Y Ogawa, Y Shimaki, T Sekiguchi, T G Muller, T Mizuno, H Noda, K Matsumoto, R Yamada, Y Ishihara, H Ikeda, H Araki, K Yamamoto, S Abe, F Yoshida, A Higuchi, S Sasaki, S Oshigami, S Tsuruta, K Asari, S Tazawa, M Shizugami, J Kimura, T Otsubo, H Yabuta, S Hasegawa, M Ishiguro, S Tachibana, E Palmer, R Gaskell, L Le Corre, R Jaumann, K Otto, N Schmitz, P A Abell, M A Barucci, M E Zolensky, F Vilas, F Thuillet, C Sugimoto, N Takaki, Y Suzuki, H Kamiyoshihara, M Okada, K Nagata, M Fujimoto, M Yoshikawa, Y Yamamoto, K Shirai, R Noguchi, N Ogawa, F Terui, S Kikuchi, T Yamaguchi, Y Oki, Y Takao, H Takeuchi, G Ono, Y Mimasu, K Yoshikawa, T Takahashi, Y Takei, A Fujii, C Hirose, S Nakazawa, S Hosoda, O Mori, T Shimada, S Soldini, T Iwata, M Abe, H Yano, R Tsukizaki, M Ozaki, K Nishiyama, T Saiki, S Watanabe, Y Tsuda
325 citations
Posted Content•
TL;DR: ASIME 2018 as discussed by the authors was a two-day workshop of almost 70 scientists and engineers in the context of the engineering needs of space missions with in-space asteroid utilisation, focusing on asteroid composition for advancing the asteroid inspace resource utilisation domain.
Abstract: In keeping with the Luxembourg government's initiative to support the future use of space resources, ASIME 2018 was held in Belval, Luxembourg on April 16-17, 2018.
The goal of ASIME 2018: Asteroid Intersections with Mine Engineering, was to focus on asteroid composition for advancing the asteroid in-space resource utilisation domain. What do we know about asteroid composition from remote-sensing observations? What are the potential caveats in the interpretation of Earth-based spectral observations? What are the next steps to improve our knowledge on asteroid composition by means of ground-based and space-based observations and asteroid rendez-vous and sample return missions? How can asteroid mining companies use this knowledge?
ASIME 2018 was a two-day workshop of almost 70 scientists and engineers in the context of the engineering needs of space missions with in-space asteroid utilisation. The 21 Questions from the asteroid mining companies were sorted into the four asteroid science themes: 1) Potential Targets, 2) Asteroid-Meteorite Links, 3) In-Situ Measurements and 4) Laboratory Measurements. The Answers to those Questions were provided by the scientists with their conference presentations and collected by A. Graps or edited directly into an open-access collaborative Google document or inserted by A. Graps using additional reference materials. During the ASIME 2018, first day and second day Wrap-Ups, the answers to the questions were discussed further. New readers to the asteroid mining topic may find the Conversation boxes and the Mission Design discussions especially interesting.
5 citations
01 Mar 2019
TL;DR: In this article, Seicoro et al. proposed a method to solve the problem of how to find the minimum distance between two points in a 2D image of the Earth from the point of view of the Sun.
Abstract: BY HAYABUSA2. S. Watanabe, M. Hirabayashi, N. Hirata, N. 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, Nagoya University, Nagoya 464-8601, Japan, (seicoro@eps.nagoya-u.ac.jp), Institute of Space and Astronautical Science, JAXA, Japan, Auburn University, Auburn, AL 36849, USA, University of Aizu, Aizu-Wakamatsu 965-8580, Japan, Kobe University, Kobe 657-8501, Japan, Research and Development Directorate, JAXA, Sagamihara 252-5210, Japan, University of Tokyo, Tokyo 113-0033, Japan, Hiroshima University, Higashi-Hiroshima 739-8526, Japan, Tohoku University, Sendai 980-8578, Japan, National Astronomical Observatory of Japan, Mitaka 181-8588, Japan, SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan, Chiba Institute of Technology, Narashino 275-0016, Japan, Kindai University, Higashi-Hiroshima 739-2116, Japan, National Institute of Advanced Industrial Science and Technology, Tokyo 135-0064 Japan, Kochi University, Kochi 780-8520, Japan, Rikkyo University, Tokyo 171-8501, Japan, National Institute of Information and Communications Technology, Kashima 314-8501, Japan, Università d’Annunzio, 65127 Pescara, Italy, Seoul National University, Seoul 08826, Korea, Planetary Science Institute, Tucson, AZ 85710, USA, Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, 06304 Nice, France, University of Colorado, Boulder, CO 80309, USA, NASA Johnson Space Center, Houston, TX 77058, USA, Meiji University, Kawasaki 214-8571, Japan, DLR (German Aerospace Center), Institute of Space Systems, 28359 Bremen, Germany. CNES (Centre National d'Etudes Spatiales), 31401 Toulouse, France, DLR, Institute of Planetary Research, 12489 Berlin-Adlershof, Germany, Institute d’Astrophysique Spatiale, 91405 Orsay, France, DLR, Microgravity User Support Center, 51147 Cologne, Germany. Current affiliation: National Institute for Environmental Studies, Tsukuba 305-8506, Japan, Current affiliation: Mitsubishi Electric Corporation, Kamakura 247-8520, Japan, Deceased.
2 citations
01 Mar 2019
1 citations