45 results on '"Takir D"'
Search Results
2. Hydrogen abundance estimation and distribution on (101955) Bennu
- Author
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Praet, A., Barucci, M.A., Clark, B.E., Kaplan, H.H., Simon, A.A., Hamilton, V.E., Emery, J.P., Howell, E.S., Lim, L.F., Zou, X.-D., Li, J.-Y., Reuter, D.C., Merlin, F., Deshapriya, J.D.P., Fornasier, S., Hasselmann, P.H., Poggiali, G., Ferrone, S., Brucato, J.R., Takir, D., Cloutis, E., Connolly, H.C., Jr, Fulchignoni, M., and Lauretta, D.S.
- Published
- 2021
- Full Text
- View/download PDF
3. Characterization of the Ryugu surface by means of the variability of the near-infrared spectral slope in NIRS3 data
- Author
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Galiano, A., Palomba, E., D'Amore, M., Zinzi, A., Dirri, F., Longobardo, A., Kitazato, K., Iwata, T., Matsuoka, M., Hiroi, T., Takir, D., Nakamura, T., Abe, M., Ohtake, M., Matsuura, S., Watanabe, S., Yoshikawa, M., Saiki, T., Tanaka, S., Okada, T., Yamamoto, Y., Takei, Y., Shirai, K., Hirata, N., Matsumoto, K., and Tsuda, Y.
- Published
- 2020
- Full Text
- View/download PDF
4. Thermally altered subsurface material of asteroid (162173) Ryugu
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Kitazato, K., Milliken, R. E., Iwata, T., Abe, M., Ohtake, M., Matsuura, S., Takagi, Y., Nakamura, T., Hiroi, T., Matsuoka, M., Riu, L., Nakauchi, Y., Tsumura, K., Arai, T., Senshu, H., Hirata, N., Barucci, M. A., Brunetto, R., Pilorget, C., Poulet, F., Bibring, J.-P., Domingue, D. L., Vilas, F., Takir, D., Palomba, E., Galiano, A., Perna, D., Osawa, T., Komatsu, M., Nakato, A., Arai, T., Takato, N., Matsunaga, T., Arakawa, M., Saiki, T., Wada, K., Kadono, T., Imamura, H., Yano, H., Shirai, K., Hayakawa, M., Okamoto, C., Sawada, H., Ogawa, K., Iijima, Y., Sugita, S., Honda, R., Morota, T., Kameda, S., Tatsumi, E., Cho, Y., Yoshioka, K., Yokota, Y., Sakatani, N., Yamada, M., Kouyama, T., Suzuki, H., Honda, C., Namiki, N., Mizuno, T., Matsumoto, K., Noda, H., Ishihara, Y., Yamada, R., Yamamoto, K., Yoshida, F., Abe, S., Higuchi, A., Yamamoto, Y., Okada, T., Shimaki, Y., Noguchi, R., Miura, A., Hirata, N., Tachibana, S., Yabuta, H., Ishiguro, M., Ikeda, H., Takeuchi, H., Shimada, T., Mori, O., Hosoda, S., Tsukizaki, R., Soldini, S., Ozaki, M., Terui, F., Ogawa, N., Mimasu, Y., Ono, G., Yoshikawa, K., Hirose, C., Fujii, A., Takahashi, T., Kikuchi, S., Takei, Y., Yamaguchi, T., Nakazawa, S., Tanaka, S., Yoshikawa, M., Watanabe, S., and Tsuda, Y.
- Published
- 2021
- Full Text
- View/download PDF
5. Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples
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Nakamura, T., primary, Matsumoto, M., additional, Amano, K., additional, Enokido, Y., additional, Zolensky, M. E., additional, Mikouchi, T., additional, Genda, H., additional, Tanaka, S., additional, Zolotov, M. Y., additional, Kurosawa, K., additional, Wakita, S., additional, Hyodo, R., additional, Nagano, H., additional, Nakashima, D., additional, Takahashi, Y., additional, Fujioka, Y., additional, Kikuiri, M., additional, Kagawa, E., additional, Matsuoka, M., additional, Brearley, A. J., additional, Tsuchiyama, A., additional, Uesugi, M., additional, Matsuno, J., additional, Kimura, Y., additional, Sato, M., additional, Milliken, R. E., additional, Tatsumi, E., additional, Sugita, S., additional, Hiroi, T., additional, Kitazato, K., additional, Brownlee, D., additional, Joswiak, D. J., additional, Takahashi, M., additional, Ninomiya, K., additional, Takahashi, T., additional, Osawa, T., additional, Terada, K., additional, Brenker, F. E., additional, Tkalcec, B. J., additional, Vincze, L., additional, Brunetto, R., additional, Aléon-Toppani, A., additional, Chan, Q. H. S., additional, Roskosz, M., additional, Viennet, J.-C., additional, Beck, P., additional, Alp, E. E., additional, Michikami, T., additional, Nagaashi, Y., additional, Tsuji, T., additional, Ino, Y., additional, Martinez, J., additional, Han, J., additional, Dolocan, A., additional, Bodnar, R. J., additional, Tanaka, M., additional, Yoshida, H., additional, Sugiyama, K., additional, King, A. J., additional, Fukushi, K., additional, Suga, H., additional, Yamashita, S., additional, Kawai, T., additional, Inoue, K., additional, Nakato, A., additional, Noguchi, T., additional, Vilas, F., additional, Hendrix, A. R., additional, Jaramillo-Correa, C., additional, Domingue, D. L., additional, Dominguez, G., additional, Gainsforth, Z., additional, Engrand, C., additional, Duprat, J., additional, Russell, S. S., additional, Bonato, E., additional, Ma, C., additional, Kawamoto, T., additional, Wada, T., additional, Watanabe, S., additional, Endo, R., additional, Enju, S., additional, Riu, L., additional, Rubino, S., additional, Tack, P., additional, Takeshita, S., additional, Takeichi, Y., additional, Takeuchi, A., additional, Takigawa, A., additional, Takir, D., additional, Tanigaki, T., additional, Taniguchi, A., additional, Tsukamoto, K., additional, Yagi, T., additional, Yamada, S., additional, Yamamoto, K., additional, Yamashita, Y., additional, Yasutake, M., additional, Uesugi, K., additional, Umegaki, I., additional, Chiu, I., additional, Ishizaki, T., additional, Okumura, S., additional, Palomba, E., additional, Pilorget, C., additional, Potin, S. M., additional, Alasli, A., additional, Anada, S., additional, Araki, Y., additional, Sakatani, N., additional, Schultz, C., additional, Sekizawa, O., additional, Sitzman, S. D., additional, Sugiura, K., additional, Sun, M., additional, Dartois, E., additional, De Pauw, E., additional, Dionnet, Z., additional, Djouadi, Z., additional, Falkenberg, G., additional, Fujita, R., additional, Fukuma, T., additional, Gearba, I. R., additional, Hagiya, K., additional, Hu, M. Y., additional, Kato, T., additional, Kawamura, T., additional, Kimura, M., additional, Kubo, M. K., additional, Langenhorst, F., additional, Lantz, C., additional, Lavina, B., additional, Lindner, M., additional, Zhao, J., additional, Vekemans, B., additional, Baklouti, D., additional, Bazi, B., additional, Borondics, F., additional, Nagasawa, S., additional, Nishiyama, G., additional, Nitta, K., additional, Mathurin, J., additional, Matsumoto, T., additional, Mitsukawa, I., additional, Miura, H., additional, Miyake, A., additional, Miyake, Y., additional, Yurimoto, H., additional, Okazaki, R., additional, Yabuta, H., additional, Naraoka, H., additional, Sakamoto, K., additional, Tachibana, S., additional, Connolly, H. C., additional, Lauretta, D. S., additional, Yoshitake, M., additional, Yoshikawa, M., additional, Yoshikawa, K., additional, Yoshihara, K., additional, Yokota, Y., additional, Yogata, K., additional, Yano, H., additional, Yamamoto, Y., additional, Yamamoto, D., additional, Yamada, M., additional, Yamada, T., additional, Yada, T., additional, Wada, K., additional, Usui, T., additional, Tsukizaki, R., additional, Terui, F., additional, Takeuchi, H., additional, Takei, Y., additional, Iwamae, A., additional, Soejima, H., additional, Shirai, K., additional, Shimaki, Y., additional, Senshu, H., additional, Sawada, H., additional, Saiki, T., additional, Ozaki, M., additional, Ono, G., additional, Okada, T., additional, Ogawa, N., additional, Ogawa, K., additional, Noguchi, R., additional, Noda, H., additional, Nishimura, M., additional, Namiki, N., additional, Nakazawa, S., additional, Morota, T., additional, Miyazaki, A., additional, Miura, A., additional, Mimasu, Y., additional, Matsumoto, K., additional, Kumagai, K., additional, Kouyama, T., additional, Kikuchi, S., additional, Kawahara, K., additional, Kameda, S., additional, Iwata, T., additional, Ishihara, Y., additional, Ishiguro, M., additional, Ikeda, H., additional, Hosoda, S., additional, Honda, R., additional, Honda, C., additional, Hitomi, Y., additional, Hirata, N., additional, Hayashi, T., additional, Hayakawa, M., additional, Hatakeda, K., additional, Furuya, S., additional, Fukai, R., additional, Fujii, A., additional, Cho, Y., additional, Arakawa, M., additional, Abe, M., additional, and Tsuda, Y., additional
- Published
- 2023
- Full Text
- View/download PDF
6. Photometric behavior of Ryugu’s NIR spectral parameters
- Author
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Longobardo, A., primary, Palomba, E., additional, Galiano, A., additional, Dirri, F., additional, Zinzi, A., additional, D’Amore, M., additional, Domingue, D., additional, Kitazato, K., additional, Yokota, Y., additional, Schroeder, S. E., additional, Iwata, T., additional, Matsuoka, M., additional, Hiroi, T., additional, Takir, D., additional, Nakamura, T., additional, Abe, M., additional, Ohtake, M., additional, Matsuura, S., additional, Watanabe, S., additional, Yoshikawa, M., additional, Saiki, T., additional, Tanaka, S., additional, Okada, T., additional, Yamamoto, Y., additional, Takei, Y., additional, Shirai, K., additional, Hirata, N., additional, Matsumoto, K., additional, and Tsuda, Y., additional
- Published
- 2022
- Full Text
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7. Effects of Space Weathering on Reflectance Spectra of Ureilites: First Studies
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Goodrich, C. A, Gillis-Davis, J, Cloutis, E, Applin, D, Takir, D, Hibbitts, C, Christoffersen, R, Fries, M, Klima, R, and Decker, S
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Lunar And Planetary Science And Exploration - Abstract
Ureilites are differentiated meteorites (ultramafic rocks interpreted to be mantle residues) that contain as much carbon as the most carbon-rich carbonaceous chondrites (CCs). Reflectance spectra of ureilites are similar to those of some CCs. Hence, ureilitic asteroids may accidentally be categorized as primitive because their spectra could resemble those of C-complex asteroids, which are thought to be CC-like. We began spectral studies of progressively laser-weathered ureilites with the goals of predicting UV-VIS-IR spectra of ureilitic asteroids, and identifying features that could distinguish differentiated from primitive dark asteroids. Space weathering has not previously been studied for ureilites, and, based on space weathering studies of CCs and other C-rich materials, it could significantly alter their reflectance spectra.
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- 2018
8. NIRS3 spectral analysis of the artificial Omusubi-Kororin crater on Ryugu
- Author
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Galiano, A, primary, Palomba, E, additional, Dirri, F, additional, Longobardo, A, additional, Kitazato, K, additional, Iwata, T, additional, Matsuoka, M, additional, Hiroi, T, additional, Takir, D, additional, Nakamura, T, additional, Abe, M, additional, Ohtake, M, additional, Matsuura, S, additional, Watanabe, S, additional, Yoshikawa, M, additional, Saiki, T, additional, Tanaka, S, additional, Okada, T, additional, Yamamoto, Y, additional, Takei, Y, additional, Shirai, K, additional, Hirata, N, additional, Matsumoto, K, additional, and Tsuda, Y, additional
- Published
- 2022
- Full Text
- View/download PDF
9. Astronomical Observations of Volatiles on Asteroids
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Rivkin, A. S., primary, Campins, H., additional, Emery, J. P., additional, Howell, E. S., additional, Licandro, J., additional, Takir, D., additional, and Vilas, F., additional
- Published
- 2015
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10. Asteroid Photometry
- Author
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Li, J.-Y., primary, Helfenstein, P., additional, Buratti, B., additional, Takir, D., additional, and Clark, B. E., additional
- Published
- 2015
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11. Spectral investigation of bright and dark areas on Ryugu surface
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Palomba, Ernesto, Watanabe, Shin, Abe, Masanao, Okada, Tatsuaki, Matsumoto, Koji, Yoshikawa, Makoto, Yamamoto, Yukio, Shirai, Kei, Takei, Yoh, Hirata, Naru, D'Amore, Mario, Ohtake, Makiko, Kitazato, Kohei, Saiki, Takanao, Tanaka, Satoshi, Iwata, Takahiro, Hiroi, Takahiro, Tsuda, Yuichi, Nakamura, Tomoki, Longobardo, Andrea, Galiano, Anna, Matsuura, Shuji, Zinzi, Angelo, Dirri, Fabrizio, Takir, D., and Andrisani, M.
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Spectral ,surface ,Ryugu - Published
- 2021
12. The Future of Planetary Defense in the Era of Advanced Surveys
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Mainzer, Amy, primary, Abell, P., additional, Bannister, Michele T., additional, Barbee, B., additional, Barnes, J., additional, III, J. F. Bell,, additional, Benner, L., additional, Betts, B., additional, Bose, Maitrayee, additional, Bottke, W., additional, Britt, D., additional, Brozović, M., additional, Bruckner, M., additional, Busch, Michael W., additional, Carey, S., additional, Castillo-Rogez, J., additional, Chesley, J., additional, Christensen, E., additional, Chodas, P., additional, Cotto-Figueroa, D., additional, Delbó, M., additional, Daly, R. T., additional, Dotson, J., additional, Eisenhardt, P., additional, Fernandez, Y. R., additional, Fevig, Ronald A., additional, Grav, T., additional, Greenstreet, S., additional, Gritsevich, M., additional, Hammel, Heidi B., additional, Harris, A., additional, Harris, W., additional, Hickson, D., additional, Hughson, Kynan, additional, Ivezić, Željko, additional, Jha, Devanshu, additional, Jones, Lynne, additional, Jurić, Mario, additional, Kacar, B., additional, Lauretta, D., additional, Lazio, Joseph, additional, Lopes, Rosaly M. C., additional, Marchis, F., additional, Marshall, Sean E., additional, Masiero, J., additional, Mathias, D., additional, McMillan, R. S., additional, McMurtry, C., additional, Michel, P., additional, Naidu, S., additional, Nolan, M. C., additional, Okada, T., additional, Pipher, J. L., additional, Raymond, Carol, additional, Rivera-Valentín, E., additional, Rivkin, A., additional, Schambeau, C. A., additional, Scheeres, D., additional, Scully, Jennifer, additional, Sonnett, S., additional, Spahr, T., additional, Stern, A., additional, Swindle, T., additional, Taylor, P., additional, Takir, D., additional, Telus, M., additional, Thomas, C., additional, Venditti, F. C. F., additional, Virkki, Anne K., additional, Wong, A., additional, and Wright, E. L., additional
- Published
- 2021
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13. Spectral investigation of bright and dark areas on Ryugu surface
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Palomba, E., Galiano, A., Mario, D’Amore, Zinzi, A., Dirri, F., Longobardo, A., Kitazato, K., Iwata, T., Abe, M., Ohtake, M., Matsuura, S., Tsuda, Y., Watanabe, S., Yoshikawa, M., Saiki, T., Tanaka, S., Okada, T., Yamamoto, Y., Takei, Y., Shirai, K., Hirata, N., Matsumoto, K., Matsuoka, M., Hiroi, T., Takir, D., Nakamura, T., and Angrisani, Marianna
- Published
- 2020
14. A Global View of the Near-Infrared Reflectance Properties of Ryugu as Seen by the NIRS3 Spectrometer on Hayabusa2
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Milliken, R. E., Kitazato, K., Riu, L., Iwata, T., Abe, M., Ohtake, M., Matsuura, S., Nakauchi, Y., Nakamura, T., Matsuoka, M., Senshu, H., Hirata, N., Hiroi, T., Pilorget, C., Brunetto, R., Poulet, F., Bibring, J.-P., Takir, D., Domingue, D. L., Vilas, F., Barucci, M. A., Perna, D., Palomba, E., Galiano, A., Tsumura, K., Osawa, T., Komatsu, M., Nakato, A., Arai, T., Takato, N., Matsunaga, T., Takagi, Y., Matsumoto, K., Kouyama, T., Yokota, Y., Tatsumi, E., Sakatani, N., Yamamoto, Y., Okada, T., Sugita, S., Honda, R., Motora, T., Kameda, S., Sawada, H., Honda, C., Yamada, M., Suzuki, H., Yoshioka, K., Hayakawa, M., Ogawa, K., Cho, Y., Takei, Y., SAIKI, T., Nakazawa, S., Tanaka, S., Yoshikawa, M., Watanabe, S., Tsuda, Y., Brunetto, Rosario, Institut d'astrophysique spatiale (IAS), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[SDU] Sciences of the Universe [physics] ,[SDU]Sciences of the Universe [physics] - Abstract
International audience; Global and sampling site spectral properties of Ryugu as seen by NIRS3 spectrometer are discussed.
- Published
- 2020
15. Characterization of the Ryugu surface by means of the variability of the nirs3 spectral slope
- Author
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Anna, Galiano, Palomba, E., Mario, D’Amore, Angelo, Zinzi, Dirri, F., Longobardo, A., Takahiro, Iwata, Masanao, Abe, Makiko, Ohtake, Shuji, Matsuura, Kwansai, Gakuin, Yuichi, Tsuda, Sei-ichiro, Watanabe, Makoto, Yoshikawa, Takanao, Saiki, Satoshi, Tanaka, Tatsuaki, Okada, Yukio, Yamamoto, Yoh, Takei, Kei, Shirai, Hirata, N., Naru, Hirata, Koji, Matsumoto, Moe, Matsuoka, Takahiro, Hiroi, Takir, D., Takashi, Nakamura, and Angrisani, Marianna
- Published
- 2020
16. Large Primitive Asteroids: Dynamical and Thermal Context
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Takir, D., Neumann, Wladimir, and Emery, J. P.
- Subjects
Primitive Asteroids Outer Main Belt - Published
- 2020
17. The Spectrophotometric Properties of Ryugu's Regolith as Seen at Opposition by the NIRS3 Onboard Hayabusa2
- Author
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Domingue, D., Kitazato, K., Matsuoka, M., Tatsumi, E., Yokota, Y., Schroder, S. E., Honda, R., Sugita, S., Hiroi, T., Brunetto, R., Vilas, F., Takir, D., Institut d'astrophysique spatiale (IAS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Brunetto, Rosario
- Subjects
[SDU] Sciences of the Universe [physics] ,[SDU]Sciences of the Universe [physics] - Abstract
International audience; At opposition / Ryugu tells a secret / Changing subtly.
- Published
- 2020
18. Telescopic Observations of Lunar Hydration: Variations and Abundance
- Author
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Honniball, C. I., primary, Lucey, P. G., additional, Ferrari‐Wong, C. M., additional, Flom, A., additional, Li, S., additional, Kaluna, H. M., additional, and Takir, D., additional
- Published
- 2020
- Full Text
- View/download PDF
19. Spectral Characteristics of Asteroid (162173) Ryugu with Hayabusa2 NIRS3
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Takir, D., Kitazato, K., Milliken, R. E., Iwata, T., Abe, M., Ohtake, M., Matsuura, S., Nakauchi, Y., Nakamura, T., Matsuoka, M., Senshu, H., Hiroi, T., Pilorget, C., Brunetto, R., Poulet, F., Riu, L., Bibring, J.-P., Domingue, D. L., Vilas, F., Barucci, M. A., Perna, D., Palomba, E., Galiano, A., Tsumura, K., Osawa, T., Komatsu, M., Nakato, A., Arai, T., Takato, N., Matsunaga, T., Takagi, Y., Matsumoto, K., Kouyama, T., Yokota, Y., Tatsumi, E., Sakatani, N., Yamamoto, Y., Okada, T., Sugita, S., Honda, R., Morota, T., Kameda, S., Sawada, H., Honda, C., Yamada, M., Suzuki, H., Yoshioka, K., Hayakawa, M., Ogawa, K., Cho, Y., Shirai, K., Shimaki, Y., Hirata, N., Yamaguchi, A., Ogawa, N., Terui, F., Yamaguchi, T., Takei, Y., SAIKI, T., Nakazawa, S., Tanaka, S., Yoshikawa, M., Watanabe, S., Tsuda, Y., Department of Geological Sciences [Providence], Brown University, Department of Environmental and Materials Engineering, Nagoya Institute, Graduate School of Science and Engineering, Tokyo Metropolitan University [Tokyo] (TMU), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Tsukuba Space Center (TKSC), Japan Aerospace Exploration Agency [Tokyo] (JAXA), Division of Geological and Planetary Sciences [Pasadena], California Institute of Technology (CALTECH), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), GEOMA, Université de Vigo, Universidade de Vigo, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Istituto di Astrofisica e Planetologia Spaziali - INAF (IAPS), Istituto Nazionale di Astrofisica (INAF), Department of Physics, Tokyo, Waseda University, IHP Microelctronics, Institute of Ecology, Tallinn University-Tallinn University, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency [Sagamihara] (JAXA), Department of Applied Physics, The University of Tokyo (UTokyo), University of Electro-Communications [Tokyo] (UEC), Stanford Synchrotron Radiation Lightsource (SSRL SLAC), SLAC National Accelerator Laboratory (SLAC), Stanford University-Stanford University, Antarctic Meteorite Research Center, National Institute of Polar Research [Tokyo] (NiPR), Advanced Materials Institute and Department of Chemistry, Fukuoka University, Department of Electronics and Electrical Engineering, Faculty of Science and Technology, Keio University, Institute for Research on Earth Evolution [Yokosuka] (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Plasma Research Center, Université de Tsukuba = University of Tsukuba, Tokyo Metropolitan University [Tokyo], RIKEN Nishina Center (for Accelerator-Based Science), Universidate de Vigo, Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), The University of Tokyo, Stanford Synchrotron Radiation Laboratory (SSRL), Stanford Linear Accelerator Center, and University of Tsukuba
- Subjects
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] - Abstract
International audience; We report recent results of the surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy .
- Published
- 2019
20. 3-µm Reflectance Spectroscopy of Outer Main Belt Asteroids: Context and Implications
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Takir, D., Neumann, Wladimir, Emery, J. P., Raymond, S. N., Institute of Physics, Berlin, HUMBOLT UNIV., SETI Institute, ECLIPSE 2019, Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and Pomies, Marie-Paule
- Subjects
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] ,[SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] ,Primitive Asteroids Outer Main Belt - Abstract
International audience; New 3-μm spectral analyses of primitive outer main-belt asteroids are placed in the context of the current thermal and dynamical theories.
- Published
- 2019
21. Distribution of the spectral slope in the NIR range of the Ryugu surface
- Author
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Galiano, Anna, Palomba, Ernesto, D'Amore, Mario, Zinzi, A., Dirri, Fabrizio, Longobardo, Andrea, Kitazato, Kohei, Iwata, Takahiro, Matsuoka, Moe, Hiroi, Takahiro, Takir, D., Nakamura, Tomoki, Abe, Masanao, Ohtake, Makiko, Matsuura, Shuji, Watanabe, S, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, and Okada, Tatsuaki
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Leitungsbereich PF ,Ryugu ,NIR ,spectral slope ,Hayabusa2 - Abstract
The Near-Earth asteroid 162173 Ryugu is the target of the JAXA sample return Hayabusa2 mission, which arrived at the asteroid in June 2018 and will analyse the surface until December 2019. Reflectance spectra of the Ryugu surface, acquired by the NIRS3 spectrometer (Near-Infrared Spectrometer), revealed a dark object with a positive slope, ranging from 0.10 to 0.29. A detailed analysis about areas with different spectral slopes has been performed, with the aim to detect physical/chemical variations and better constrain the history of Ryugu.
- Published
- 2019
22. Characteristics of dark and bright areas on the asteroid Ryugu
- Author
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Palomba, E., Galiano, Anna, D'Amore, Mario, Zinzi, A., Dirri, F., Longobardo, Andrea, Kitazato, Kohei, Iwata, Takahiro, Matsuoka, Moe, Hiroi, Takahiro, Takir, D., Nakamura, Tomoki, Abe, Masanao, Ohtake, Makiko, Matsuura, Shuji, Watanabe, S, Yoshikawa, M., Saiki, Takanao, Tanaka, Satoshi, and Okada, Tatsuaki
- Subjects
spectroscopy ,asteroid ,NIRS3 ,Leitungsbereich PF ,Ryugu ,Hayabusa2 - Abstract
The Japanese Hayabusa2 space mission approached the Near-Earth asteroid 162173 Ryugu in June 2018. Since then, it is taking data and mapping in detail the asteroid surface, finding a very dark and boulder rich asteroid with very homogenous spectral reflectance properties in the near IR. By using the data obtained by the NIRS 3 spectrometer, the intent of this work is to detect dark and bright patches and to study their characteristics, with the support of statistical and machine learning tools.
- Published
- 2019
23. Infrared Spectra of Dark Asteroid Ryugu and Carbonaceous Chondrites
- Author
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Matsuoka, M., Nakamura, T., Hiroi, T., Kitazato, K., Senshu, H., Iwata, T., Abe, M., Amano, K., Kobayashi, S., Osawa, T., Ohtake, M., Matsuura, S., Arai, T., Komatsu, M., Nakato, A., Nakauchi, Y., Pilorget, C., Brunetto, R., Poulet, F., Riu, L., Domingue, D. L., Vilas, F., Takir, D., Palomba, E., Galiano, A., Milliken, R., Perna, D., Barucci, M. A., Bibring, J. P., Institut d'astrophysique spatiale (IAS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Brunetto, Rosario
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[SDU] Sciences of the Universe [physics] ,6207 Comparative planetology ,PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS ,[SDU]Sciences of the Universe [physics] ,6045 Physics and chemistry of materials ,PLANETARY SCIENCES: SOLID SURFACE PLANETS ,PLANETARY SCIENCES: COMETS AND SMALL BODIES ,5410 Composition ,6008 Composition - Abstract
International audience; Near-infrared Spectrometer (NIRS3) onboard Hayabusa2 successfully obtained reflectance spectra of the C-type near-Earth asteroid Ryugu over a wavelength range of 1.8-3.2 µm. It was observed that Ryugu exhibits very low albedo (less than 0.02 at 2.0 μm), a slightly positive spectral slope, and an ubiquitous weak OH absorption band at 2.72 μm. These properties are nearly homogeneous across the asteroid surface. However, data of regions near the equator with ~40 m spatial resolution (~20 km altitude) exhibit variations in the 2.0-μm albedo that are possibly associated with geomorphological features. Reflectance values are higher near crater rims and lower in crater centers. Future updates to the photometric correction may change these apparent associations, but it is also observed that spectra of several flat areas without any obvious geomorphological features show relatively high reflectance (e.g., near 270, 300, and 350 degrees longitude, close to the equatorial ridge). If verified, the brighter areas could indicate surface materials that (a) are relatively carbon-poor, (b) have different physical properties, such as smaller grain size and/or decreased porosity, and/or (c) exhibit different forms/degrees of space weathering. Comparing spectra of carbonaceous chondrites with those of Ryugu shows that no meteorites are an ideal spectral match to Ryugu at all wavelengths. However, spectra of shocked or heated carbonaceous chondrites are most similar with their low albedo and weak, narrow OH absorption feature at 2.72 μm. Future lab analyses of samples returned from Ryugu will provide additional information on the mineralogical and chemical properties of Ryugu and how these relate to its spectral characteristics. Acknowledgements: We appreciate support from the National Institute of Polar Research for providing carbonaceous chondrites, the Japan Society for the Promotion of Science (JSPS) Core-to-Core Program "International Network of Planetary Sciences", the NASA Hayabusa2 Participating Scientist Program (NNX16AL34G), and the Solar System Exploration Research Virtual Institute 2016 (SSERVI16) Cooperative Agreement (NNH16ZDA001N) SSERVI-TREX.
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- 2019
24. Multivariable statistical analysis of spectrophotometry and spectra of (162173) Ryugu as observed by JAXA Hayabusa2 mission
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Barucci, M. A., Hasselmann, P. H., Fulchignoni, M., Deshapriya, J. D. P., Perna, D., Domingue, D., Matsuura, S., Hiroi, T., Nakamura, T., Takir, D., Vilas, F., Hirata, N., Honda, Rie, Yokota, Yasuhiro, Sugita, Seiji, Kitazato, Kohei, Tatsumi, Eri, Morota, Tomokatsu, Kameda, Shingo, Iwata, Takahiro, Abe, Masanao, Ohtake, Makiko, Matsuoka, Moe, Kouyama, Toru, Suzuki, Hidehiko, Yamada, Manabu, Sakatani, Naoya, Honda, Chikatoshi, Ogawa, Kazunori, Hayakawa, Masahiko, Yoshioka, Kazuo, Cho, Yuichiro, Sawada, Hirotaka, Tanaka, Satoshi, Yamamoto, Yukio, Yoshikawa, Makoto, Watanabe, Sei-ichiro, Tsuda, Yuichi, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
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010504 meteorology & atmospheric sciences ,Context (language use) ,Astrophysics ,01 natural sciences ,Space weathering ,Spectral line ,minor planets, asteroids: individual: RYUGU ,minor planets asteroids: individual: RYUGU ,techniques: photometric ,Spectrophotometry ,0103 physical sciences ,Spectral slope ,medicine ,14. Life underwater ,010303 astronomy & astrophysics ,0105 earth and related environmental sciences ,Physics ,methods: statistical ,medicine.diagnostic_test ,Mode (statistics) ,Astronomy and Astrophysics ,Regolith ,Space and Planetary Science ,Asteroid ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,techniques: spectroscopic - Abstract
著者人数: 39名, Accepted: 2019-07-04, 資料番号: SA1190099000
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- 2019
25. Hayabusa2/NIRS3 spectral observations of asteroid (162173) Ryugu
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Brunetto, R., Kitazato, K., Iwata, T., Abe, M., Ohtake, M., Matsuura, S., Arai, T., Nakauchi, Y., Nakamura, T., Matsuoka, M., Senshu, H., Hirata, N., Hiroi, T., Pilorget, C., Poulet, F., Riu, L., Domingue, D. L., Takir, D., Palomba, E., Milliken, R., Perna, D., Barucci, M. A., Bibring, J. P., Watanabe, S., Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Environmental and Materials Engineering, Nagoya Institute, Graduate School of Science and Engineering, Tokyo Metropolitan University [Tokyo] (TMU), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Tsukuba Space Center (TKSC), Japan Aerospace Exploration Agency [Tokyo] (JAXA), Brown University, Division of Geological and Planetary Sciences [Pasadena], California Institute of Technology (CALTECH), Istituto di Astrofisica e Planetologia Spaziali - INAF (IAPS), Istituto Nazionale di Astrofisica (INAF), Jet Propulsion Laboratory (JPL), California Institute of Technology (CALTECH)-NASA, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Tokyo Metropolitan University [Tokyo], RIKEN Nishina Center (for Accelerator-Based Science), NASA-California Institute of Technology (CALTECH), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)
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PLANETARY SCIENCES: COMETS AND SMALL BODIESDE: 6205 Asteroids ,PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS ,[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] ,PLANETARY SCIENCES: SOLAR SYSTEM OBJECTSDE: 6207 Comparative planetology ,6040 Origin and evolution ,PLANETARY SCIENCES: COMETS AND SMALL BODIESDE: 6055 Surfaces - Abstract
International audience; On 27 June 2018, JAXA's Hayabusa2 spacecraft arrived at a distance of 20 km from its target 162173 Ryugu, a sub-km sized asteroid in the near-Earth space, and began its 1.5-year asteroid proximity operation. We have performed near-infrared (1.8-3.2 µm) spectroscopic observations of Ryugu using the NIRS3 instrument onboard Hayabusa2 to begin characterizing and mapping the surface composition. The initial data, obtained by NIRS3 at a spatial resolution of about 35 m, show a very dark surface with little spectral variations across the surface. At this stage, the lack of a significant 2.7-µm feature illustrates that the spectra of Ryugu are different from those of phyllosilicate-rich carbonaceous chondrites. We will present the results of the analysis of the NIRS3 data, including the high-resolution data to be obtained during the first descent operations.
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- 2018
26. The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy
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Kitazato, K., primary, Milliken, R. E., additional, Iwata, T., additional, Abe, M., additional, Ohtake, M., additional, Matsuura, S., additional, Arai, T., additional, Nakauchi, Y., additional, Nakamura, T., additional, Matsuoka, M., additional, Senshu, H., additional, Hirata, N., additional, Hiroi, T., additional, Pilorget, C., additional, Brunetto, R., additional, Poulet, F., additional, Riu, L., additional, Bibring, J.-P., additional, Takir, D., additional, Domingue, D. L., additional, Vilas, F., additional, Barucci, M. A., additional, Perna, D., additional, Palomba, E., additional, Galiano, A., additional, Tsumura, K., additional, Osawa, T., additional, Komatsu, M., additional, Nakato, A., additional, Takato, N., additional, Matsunaga, T., additional, Takagi, Y., additional, Matsumoto, K., additional, Kouyama, T., additional, Yokota, Y., additional, Tatsumi, E., additional, Sakatani, N., additional, Yamamoto, Y., additional, Okada, T., additional, Sugita, S., additional, Honda, R., additional, Morota, T., additional, Kameda, S., additional, Sawada, H., additional, Honda, C., additional, Yamada, M., additional, Suzuki, H., additional, Yoshioka, K., additional, Hayakawa, M., additional, Ogawa, K., additional, Cho, Y., additional, Shirai, K., additional, Shimaki, Y., additional, Yamaguchi, A., additional, Ogawa, N., additional, Terui, F., additional, Yamaguchi, T., additional, Takei, Y., additional, Saiki, T., additional, Nakazawa, S., additional, Tanaka, S., additional, Yoshikawa, M., additional, Watanabe, S., additional, and Tsuda, Y., additional
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- 2019
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27. 3-μm spectroscopy of water-rich meteorites and asteroids: New results and implications
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Takir, D., P. Emery, J., and Hibbitts, C.A.
- Abstract
第8回極域科学シンポジウム/個別セッション:[OA] 南極隕石 / はやぶさ12月5日(火)国語研究所 2階講堂The Eighth Symposium on Polar Science/Ordinary sessions: [OA] Antarctic meteorites / HayabusaTue. 5 Dec./2F Auditorium, National Institute for Japanese Language and Linguistics
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- 2017
28. A New Enceladus Global Control Network, Image Mosaic, and Updated Pointing Kernels From Cassini's 13-Year Mission
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Bland, M. T., primary, Becker, T. L., additional, Edmundson, K. L., additional, Roatsch, Th., additional, Archinal, B. A., additional, Takir, D., additional, Patterson, G. W., additional, Collins, G. C., additional, Schenk, P. M., additional, Pappalardo, R. T., additional, and Cook, D. A., additional
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- 2018
- Full Text
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29. Oxo Crater on (1) Ceres: Geological History and the Role of Water-ice
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Nathues, A., Platz, T., Hoffmann, M., Thangjam, G., Cloutis, E. A., Applin, D. M., Le Corre, L., Reddy, V., Mengel, K., Protopapa, S., Takir, D., Preusker, F., Schmidt, B. E., Russell, C. T., Nathues, A., Platz, T., Hoffmann, M., Thangjam, G., Cloutis, E. A., Applin, D. M., Le Corre, L., Reddy, V., Mengel, K., Protopapa, S., Takir, D., Preusker, F., Schmidt, B. E., and Russell, C. T.
- Abstract
Dwarf planet Ceres (∅ ∼ 940 km) is the largest object in the main asteroid belt. Investigations suggest that Ceres is a thermally evolved, volatile-rich body with potential geological activity, a body that was never completely molten, but one that possibly partially differentiated into a rocky core and an ice-rich mantle, and may contain remnant internal liquid water. Thermal alteration and the infall of exogenic material contribute to producing a (dark) carbonaceous chondritic-like surface containing ammoniated phyllosilicates. Here we report imaging and spectroscopic analyses of data on the bright Oxo crater derived from the Framing Camera and the Visible and Infrared Spectrometer on board the Dawn spacecraft. We confirm that the transitional complex crater Oxo (∅ ∼ 9 km) exhibits exposed surface water-ice. We show that this water-ice-rich material is associated exclusively with two lobate deposits at pole-facing scarps, deposits that also contain carbonates and admixed phyllosilicates. Due to Oxo’s location at −4802 m below the cerean reference ellipsoid and its very young age of only 190 ka (1σ: +100 ka, −70 ka), Oxo is predestined for ongoing water-ice sublimation.
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- 2017
30. Completed global control network and basemap of Enceladus
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Becker, T.L., Bland, M., Edmundson, K., Soderblom, L.A., Takir, D., Patterson, G.W., Collins, G.C., Pappalardo, R.T., Roatsch, Thomas, and Schenk, P.
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Enceladus ,control network ,Cassini - Published
- 2016
31. Oxo Crater on (1) Ceres: Geological History and the Role of Water-ice
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Nathues, A., primary, Platz, T., additional, Hoffmann, M., additional, Thangjam, G., additional, Cloutis, E. A., additional, Applin, D. M., additional, Le Corre, L., additional, Reddy, V., additional, Mengel, K., additional, Protopapa, S., additional, Takir, D., additional, Preusker, F., additional, Schmidt, B. E., additional, and Russell, C. T., additional
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- 2017
- Full Text
- View/download PDF
32. PHASE ANGLE EFFECTS ON 3 μ m ABSORPTION BAND ON CERES: IMPLICATIONS FOR DAWN MISSION
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Takir, D., primary, Reddy, V., additional, Sanchez, J. A., additional, Corre, L. Le, additional, Hardersen, P. S., additional, and Nathues, A., additional
- Published
- 2015
- Full Text
- View/download PDF
33. SPECTRAL AND MINERALOGICAL ANALYSES OF AGUAS ZARCAS IN SEARCH OF ITS PARENT BODY.
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Takir, D., Howard, K. T., Stockstill-Cahill, K. R., Hibbitts, C. A., Abreu, N., Fries, M., and Zolensky, M. E.
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CARBONACEOUS chondrites (Meteorites) , *NEAR infrared spectroscopy , *METEORITES , *PHYLLOSILICATES , *ANALYTICAL geochemistry , *ALIPHATIC compounds , *PETROLOGY , *INFRARED absorption - Abstract
Introduction: Aguas Zarcas is an intriguing carbonaceous chondrite that fell in Aguas Zarcas district, San Carlos, Alajulea, Costa Rica on 23 April 2019 [1]. This carbonaceous chondrite was found to be a breccia at al all scales with diverse lithologies (metal-rich, brecciated CM, and CI) [2]. Here we present spectroscopic and PSD-XRD analyses of a sample of Aguas Zarcas (donated to NASA JSC by Robert Ward) to better understand the origin and parent body for this meteorite. The spectral and mineralogical analyses are placed in the context of the published petrological and geochemical analyses of Aguas Zarcas, and its spectra are compared to a suite of spectra of asteroidal materials, including cabon-bearing asteroids, asteroid returned samples, and carbonaceous chondrites. The focus of this investigation will be on hydrated minerals and carbon-bearing materials, including organics and carbonates. Methods: We ground a chip of Aguas Zarcas into a ~150 mg powder. Bidirectional reflectance spectra (incidence=15°, emission=45°, phase angle=60°) of Aguas Zarcas were collected at the Laboratory for Spectroscopy under Planetary Environmental Conditions (LabSPEC) at the Johns Hopkins University Applied Physics Laboratory (JHU APL). Spectra were recorded under vacuum- and thermally-desiccated conditions. Spectra were measured from ~0.8 to ~8 µm using a high-vacuum chamber system (10-6 to 10-7 Torr) with a Bruker Vertex 70 FTIR spectrometer and an external liquid-nitrogen cooled MCT detector. The same Aguas Zarcas powder analyzed using NIR spectroscopy was used for position-sensitive detector X-ray diffraction (PSD-XRD) measurements at Kingsborough Community College for further analysis. Results and Discussion: Near-infrared reflectance spectra of Aguas Zarcas show signatures of absorption features (Figure 1, left) at ~0.7 µm due to an Fe2+- Fe3+ charge transfer transition in oxidized iron in phyllosilicates (e.g., [3]), at ~2.78 µm attributed to v1 symmetric OH stretch in phyllosilicates (e.g., [4]), and at ~3.4-3.5 µm attributed to Cstretching of aliphatic organic compounds (e.g., [5]). The bulk mineralogy of Aguas Zarcas revealed by PSD-XRD analysis shows that this sample is dominated by cronstedtite (37%) and Mg/Fe serpentine (40%), with a derived PSF [total phyllosilicate / (total anhydrous silicate + total phyllosilicate)] of 0.81 (Figure 1, right) that is consistent with the CM2 chondrite lithology. The spectral and mineralogical analyses suggest that Aguas Zarcas is consistent with 'Group 2' studied by [4]. This group (e.g., the ungrouped Bells) is thought to have experienced a moderate degree of aqueous alteration with a 3-µm band (v1 symmetric HOH and ?3 asymmetric OH stretch in phyllosilicates) center that varies from 2.76 to 2.80 µm. The studied sample of Aguas Zarcas is also consistent with the 'sharp' group of carbon-bearing asteroids (e.g., 121 Hermione), located in the 2.5 < a < 3.5 AU heliocentric region [6]. Future work will include spectral and mineralogical analyses of Aguas Zarcas samples that represent other lithologies (i.e., metalrich, CI). [ABSTRACT FROM AUTHOR]
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- 2022
34. SPECTRAL ANALYSIS OF (162173) RYUGU RETURNED SAMPLE UNDER SIMULATED SPACE VACUUM CONDITIONS.
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Takir, D., Hibbitts, C. H., Stockstill-Cahill, K. R., Amano, K., Matsuoka, M., Nakamura, T., Yurimoto, H., Noguchi, T., Okazaki, R., Yabuta, H., Naraoka, H., Sakamoto, K., Tachibana, S., Watanabe, S., and Tsuda, Y.
- Subjects
- *
MONOCHROMATORS , *NEAR-earth asteroids , *VISIBLE spectra , *ULTRAHIGH vacuum , *LOCUST bean gum , *PHYSICS laboratories , *VACUUM chambers , *PHTHALATE esters - Abstract
Introduction: JAXA's Hayabusa2 mission has successfully returned to Earth ~5 g of pebbles and sand from asteroid (162173) Ryugu, a near-Earth carbonaceous asteroid [1]. Preliminary analyses of Ryugu's returned samples revealed they have diverse sizes and contain rugged and smooth particles [2]. Additionally, near-infrared reflectance spectra of Ryugu samples showed the presence of absorption features at ~2.7 µm and ~3.4 µm, attributed to OH- and carbon-bearing materials, including organics and carbonates, respectively [2, 3]. Here, as part of the Hayabusa2 Initial Analysis Stone Team we acquired more spectra of Ryugu samples for further study of the asteroid mineralogy and chemistry. The studied sample (C0002) was retrieved during the mission second touchdown. Ultraviloet (UV), visible and near-infrared (NIR) spectra of the sample were measured in simulated space vacuum conditions. Instrumentation and Procedure: Bidirectional reflectance spectra (incidence=15°, emission=45°, phase angle=60°) of parts of a large Ryugu sample of C0002 (C0002-003 and 004) (< 500 µm in grain size) were collected at the Laboratory for Spectroscopy under Planetary Environmental Conditions (LabSPEC) at the Johns Hopkins University Applied Physics Laboratory (JHU APL). All spectra were collected under space simulated vacuum conditions using a Bruker Vertex 70 FTIR with a spectral range between ~1 µm to 8 µm and spectral resolution of 0.5 cm-1, a McPherson vacuum UV/vis monochromator spectrometer that covers the spectral range between 0.13 µm and 0.57 µm, and a SVC HR-1024i spectrometer with a spectral range between 0.3 µm and 2.4 µm. The spectrometers were mounted to an ultra-high vacuum (UHV) chamber. Because of the very small quantity of the received sample, we had to design and build a new and custom sample holder (~2 mm in diameter) that we filled with Ryugu sample and loaded into the sealed vacuum chamber. Ryugu sample spectra were collected under ambient conditions and periodically as the chamber pumps down and after the sample was left to pump down overnight. Final sample spectra were measured after the chamber reached its base pressure (~10-8 Torr). Because some of our sample was mixed with glycol phthalate glue, we were not able to slightly heat the sample (to drive off the remaining adsorbed terrestrial water) to avoid altering the physical properties of the sample. Results: Here we present our preliminary spectral measurements and analysis of Ryugu sample C0002. Figure 1 shows a UV/Visible spectrum of the sample, measured under space simulated vacuum conditions. The shown UV/Visible spectrum is characterized by a red slope in the ~0.25-0.57 µm spectral range with no apparent and strong absorption features. In this work, the measured UV, Visible, and NIR spectra of Ryugu sample will also be compared to Ryugu samples that were measured by other teams. [ABSTRACT FROM AUTHOR]
- Published
- 2022
35. THERMOPHYSICAL MODELING OF (3200) PHAETHON USING A RADAR/LIGHTCURVE SHAPE AND CONSTRAINED BY INFRARED OBSERVATIONS WITH SPEX AT NASA/IRTF.
- Author
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Vervack Jr., R. J., Howell, E. S., Fernández, Y. R., Magri, C., Marshall, S. E., Hinkle, M. L., Rivkin, A. S., Emery, J. P., Takir, D., and McGraw, L.
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NEAR-earth asteroids ,ALBEDO ,MULTIPLE scattering (Physics) ,ASTEROIDS ,ASTEROID orbits ,METEOR showers - Published
- 2021
36. SPECTRAL INVESTIGATION OF DARK AND BRIGHT AREAS ON THE SURFACE OF RYUGU.
- Author
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Palomba, E., Galiano, A., D'Amore, M., Zinzi, A., Dirri, F., Longobardo, A., Kitazato, K., Iwata, T., Matsuoka, M., Hiroi, T., Takir, D., Nakamura, T., Abe, M., Ohtake, M., Matsuura, S., Watanabe, S., Yoshikawa, M., Saiki, T., Tanaka, S., and Okada, T.
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SURFACE area ,NEAR-earth asteroids ,IMPACT craters ,ALBEDO ,PLANETARY science - Published
- 2021
37. RYUGU SPECTRAL SURFACE REGIONS VIA UNSUPERVISED MACHINE LEARNING CLASSIFICATION OF NIRS3 DATA.
- Author
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Palomba, E., D'Amore, M., Galiano, A., Zinzi, A., Dirri, F., Longobardo, A., Kitazato, K., Iwata, T., Matsuoka, M., Hiroi, T., Takir, D., Nakamura, T., Abe, M., Ohtake, M., Matsuura, S., Watanabe, S., Yoshikawa, M., Saiki, T., Tanaka, S., and Okada, T.
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MACHINE learning ,PLANETARY science ,SOLAR system ,CLASSIFICATION ,ALBEDO - Published
- 2021
38. A GLOBAL VIEW OF THE NEAR-INFRARED REFLECTANCE PROPERTIES OF RYUGU AS SEEN BY THE NIRS3 SPECTROMETER ON HAYABUSA2.
- Author
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Milliken, R. E., Kitazato, K., Riu, L., Iwata, T., Abe, M., Ohtake, M., Matsuura, S., Arai, T., Nakauchi, Y., Nakamura, T., Mastuoka, M., Senshu, H., Hirata, N., Hiroi, T., Pilorget, C., Brunetto, R., Poulet, F., Bibring, J.-P., Takir, D., and Domingue, D. L.
- Subjects
REFLECTANCE ,CARBONACEOUS chondrites (Meteorites) ,SPECTROMETERS ,IR spectrometers ,RADIANCE ,SPACE environment ,CHURYUMOV-Gerasimenko comet - Published
- 2021
39. NEAR-INFRARED SPECTRAL VARIABILITY ON ASTEROID RYUGU.
- Author
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Kitazato, K., Milliken, R. E., Iwata, T., Abe, M., Ohtake, M., Matsuura, S., Arai, T., Nakauchi, Y., Nakamura, T., Mastuoka, M., Senshu, H., Hirata, N., Hiroi, T., Pilorget, C., Brunetto, R., Poulet, F., Riu, L., Bibring, J.-P., Takir, D., and Domingue, D. L.
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SPACE environment ,PLANETARY science ,ROTATIONAL motion ,ASTEROIDS ,SAPONITE - Published
- 2021
40. WHAT IS THE HYDRATED PHASE ON BENNU'S SURFACE?
- Author
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Hanna, R. D., Hamilton, V. E., Haberle, C. W., Kaplan, H. H., Howell, E. S., Takir, D., Zolensky, M. E., and Lauretta, D. S.
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SPACE environment ,EARTH sciences ,IR spectrometers ,SPACE exploration - Published
- 2021
41. DISTRIBUTION OF NIR SPECTRAL SLOPE ON RYUGU SURFACE.
- Author
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Galiano, A., Palomba, E., D’Amore, M., Zinzi, A., Dirri, F., Longobardo, A., Kitazato, K., Iwata, T., Matsuoka, M., Hiroi, T., Takir, D., Nakamura, T., Abe, M., Ohtake, M., Matsuura, S., Watanabe, S., Yoshikawa, M., Saiki, T., Tanaka, S., and Okada, T.
- Subjects
NEAR-earth asteroids ,IMPACT craters ,SPACE environment - Published
- 2021
42. Accurate interpretation of thyroid dysfunction during pregnancy: should we continue to use published guidelines instead of population-based gestation-specific reference intervals for the thyroid-stimulating hormone (TSH)?
- Author
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Rana Turkal, Cem Armağan Turan, Onur Elbasan, Serenay Aytan, Burcu Çakmak, Büşra Gözaydınoğlu, Duygu Ceyda Takır, Ozan Ünlü, Günel Bahramzada, Ahmet Faruk Tekin, Tülay Çevlik, Esra Esim Büyükbayrak, Önder Şirikçi, Hülya Gözü, Goncagül Haklar, and Turkal R., TURAN C. A., ELBASAN O., Aytan S., Cakmak B., Gozaydinoglu B., Takir D. C., ÜNLÜ O., Bahramzada G., Tekin A. F., et al.
- Subjects
CHINESE WOMEN ,HYPERTHYROIDISM ,1ST TRIMESTER ,Thyrotropin ,OBSTETRICS & GYNECOLOGY ,Sağlık Bilimleri ,Clinical Medicine (MED) ,PARAMETERS ,Reference interval ,ETHNIC-DIFFERENCES ,KADIN HASTALIKLARI & DOĞUM ,SERUM TSH ,Pregnancy ,Surgery Medicine Sciences ,Health Sciences ,MANAGEMENT ,Humans ,Klinik Tıp (MED) ,Retrospective Studies ,ATA ,Klinik Tıp ,Thyroid dysfunction ,Obstetrics and Gynecology ,ASSOCIATION ,CLINICAL MEDICINE ,POSTPARTUM ,Thyroid Diseases ,Kadın Hastalıkları ve Doğum ,Tıp ,Thyroxine ,Cerrahi Tıp Bilimleri ,TESTS ,Medicine ,Gestation-specific ,Female - Abstract
Background Considering the changes in thyroid physiology associated with pregnancy and poor outcomes related to abnormal maternal thyroid function, international guidelines recommend using population-based trimester-specific reference intervals (RIs) for thyroid testing. If these RIs are not available in the laboratory, implementing recommended fixed cut-off values globally is still controversial. To address this issue, we aimed to establish appropriate RI of thyroid-stimulating hormone (TSH) in pregnant Turkish women for our laboratory and compare the prevalence of thyroid dysfunction based on the established and recommended criteria. Methods Of 2638 pregnant women, 1777 women followed in the obstetric outpatient were enrolled in the reference interval study after applying exclusion criteria related to medical and prenatal history. A retrospective study was conducted by collecting data from July 2016 to March 2019. Serum TSH was measured by UniCel DxI 800 Immunoassay System (Beckman Coulter Inc., Brea, CA, USA). The study design relied on two approaches in order to classify pregnant women: trimester-specific and subgroup-specific; the latter involved dividing each trimester into two subgroups: T1a, T1b, T2a, T2b, T3a, T3b. The lower and upper limits of the RIs were derived by the parametric method after normalizing the data distribution using the modified Box-Cox power transformation method. Results The lowest TSH value was detected at 8-12 weeks in early pregnancy, and the median value of TSH in the T1b subgroup was significantly lower than the T1a subgroup (P a, T2b, and T3b subgroups compared to the preceding subgroups (P P Conclusions We conclude that establishing gestation- and laboratory-specific RIs, especially for TSH, is essential for diagnosing thyroid disorders in pregnancy, and the recommended universal cut-off values, which may contribute to the risk of a misdiagnosis or a missed diagnosis, should be taken with caution in the clinical setting. However, regarding the fluctuation of thyroid function tests throughout pregnancy, trimester-specific RIs are insufficient, and implementing split phases is required.
- Published
- 2021
43. Origin of asteroid (101955) Bennu and its connection to the New Polana family.
- Author
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Takir D, Emery JP, Bottke WF, and Arredondo A
- Abstract
The asteroid (142) Polana is classified as a B-type asteroid located in the inner Main Belt. This asteroid is the parent of the New Polana family, which has been proposed to be the likely source of primitive near-Earth asteroids such as the B-type asteroid (101955) Bennu. To investigate the compositional correlation between Polana and Bennu at the 3 µm band and their aqueous alteration histories, we analyzed the spectra of Polana in the ~ 2.0-4.0 µm spectral range using the NASA Infrared Telescope Facility in Hawai'i. Our findings indicate that Polana does not exhibit discernable 3 µm hydrated mineral absorption (within 2σ), which is in contrast to asteroid Bennu. Bennu displayed a significant 3 µm absorption feature similar to CM- and CI-type carbonaceous chondrites. This suggests two possibilities: either Bennu did not originate from the New Polana family parented by asteroid Polana or the interior of Bennu's parent body was not homogenous, with diverse levels of aqueous alteration. Several explanations support the latter possibility, including heating due to shock waves and pressure, which could have caused the current dehydrated state of Bennu's parent body., (© 2024. The Author(s).)
- Published
- 2024
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44. Reassigning CI chondrite parent bodies based on reflectance spectroscopy of samples from carbonaceous asteroid Ryugu and meteorites.
- Author
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Amano K, Matsuoka M, Nakamura T, Kagawa E, Fujioka Y, Potin SM, Hiroi T, Tatsumi E, Milliken RE, Quirico E, Beck P, Brunetto R, Uesugi M, Takahashi Y, Kawai T, Yamashita S, Enokido Y, Wada T, Furukawa Y, Zolensky ME, Takir D, Domingue DL, Jaramillo-Correa C, Vilas F, Hendrix AR, Kikuiri M, Morita T, Yurimoto H, Noguchi T, Okazaki R, Yabuta H, Naraoka H, Sakamoto K, Tachibana S, Yada T, Nishimura M, Nakato A, Miyazaki A, Yogata K, Abe M, Okada T, Usui T, Yoshikawa M, Saiki T, Tanaka S, Terui F, Nakazawa S, Watanabe SI, and Tsuda Y
- Abstract
The carbonaceous asteroid Ryugu has been explored by the Hayabusa2 spacecraft to elucidate the actual nature of hydrous asteroids. Laboratory analyses revealed that the samples from Ryugu are comparable to unheated CI carbonaceous chondrites; however, reflectance spectra of Ryugu samples and CIs do not coincide. Here, we demonstrate that Ryugu sample spectra are reproduced by heating Orgueil CI chondrite at 300°C under reducing conditions, which caused dehydration of terrestrial weathering products and reduction of iron in phyllosilicates. Terrestrial weathering of CIs accounts for the spectral differences between Ryugu sample and CIs, which is more severe than space weathering that likely explains those between asteroid Ryugu and the collected samples. Previous assignments of CI chondrite parent bodies, i.e., chemically most primitive objects in the solar system, are based on the spectra of CI chondrites. This study indicates that actual spectra of CI parent bodies are much darker and flatter at ultraviolet to visible wavelengths than the spectra of CI chondrites.
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- 2023
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45. Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration.
- Author
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Takir D, Kareta T, Emery JP, Hanuš J, Reddy V, Howell ES, Rivkin AS, and Arai T
- Abstract
Asteroid (3200) Phaethon is an active near-Earth asteroid and the parent body of the Geminid Meteor Shower. Because of its small perihelion distance, Phaethon's surface reaches temperatures sufficient to destabilize hydrated materials. We conducted rotationally resolved spectroscopic observations of this asteroid, mostly covering the northern hemisphere and the equatorial region, beyond 2.5-µm to search for evidence of hydration on its surface. Here we show that the observed part of Phaethon does not exhibit the 3-µm hydrated mineral absorption (within 2σ). These observations suggest that Phaethon's modern activity is not due to volatile sublimation or devolatilization of phyllosilicates on its surface. It is possible that the observed part of Phaethon was originally hydrated and has since lost volatiles from its surface via dehydration, supporting its connection to the Pallas family, or it was formed from anhydrous material.
- Published
- 2020
- Full Text
- View/download PDF
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