Observational and numerical studies that connect the physical and dynamical evolution of near-Earth asteroids

• Project/Area Number: 18K03730
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 17010:Space and planetary sciences-related
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Ito Takashi 国立天文台, 天文シミュレーションプロジェクト, 講師 (40280565)
• Co-Investigator(Kenkyū-buntansha): 吉田 二美 産業医科大学, 医学部, 助教 (20399306) ; 樋口 有理可 産業医科大学, 医学部, 助教 (90597139)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: 小惑星 / 彗星 / 太陽系力学 / 光学観測 / 偏光観測 / サイズ頻度分布 / オールト雲 / 海王星以遠天体 / 冥王星 / 共鳴 / 極回廊 / 力学 / Phaethon / von Zeipel / 分光観測 / 近地球小惑星 / 力学進化 / 衝突破壊

Outline of Final Research Achievements

The main focus of this study was on near-Earth asteroids that approach the Earth. We conducted observational and theoretical studies that should elucidate their dynamical and physical evolution. The results of this study are diverse, but the following information was obtained: Size-frequency distribution of widely distributed asteroids and its dependence on the heliocentric distance, polarimetric feature common to the solar system minor bodies and interpretation of their physical backgrounds, distribution of spin velocities of small bodies extending beyond the main asteroid belt and their estimated density, mechanism of the libration of perihelion observed in the motion of small bodies with large orbital inclination, and so on. These findings can serve as a basis not only for the study of near-Earth asteroids but also for the study of solar system and extra-solar system small bodies in a broader sense.

Academic Significance and Societal Importance of the Research Achievements

昨今の観測技術の発展や探査計画の進捗に伴い人間が持つ宇宙の認識、殊に私達が住むこの太陽系に関する認識は急速に広がった。太陽系には様々な種類の天体があるが、小惑星や彗星などの小天体は太陽系初期の情報をよく保存する貴重な試料であり、この認識拡大の時代に於いてそれらを研究する意義はかつてなく大きい。こうした意識は研究社会に於いて国際的に共通なものであり、こうした状況の下で太陽系小天体の観測的・理論的な研究は学術界のみならず社会的な知的好奇心からもその成果創出を強く要請される。本報告書に記述した私達の研究が生み出した成果の多くはそうした要請に正面から応えるものである。

Research Products

• [Int'l Joint Research] Lille University(フランス)
• [Int'l Joint Research] Seoul National University(韓国)
• [Int'l Joint Research] Southwest Research Institute/University of Arizona(米国)
• [Int'l Joint Research] 國立中央大學(台灣)
• [Int'l Joint Research] University of Tront(カナダ)
• [Int'l Joint Research] 國立中央大學(その他の国・地域)
• [Int'l Joint Research] Southwest Research Institute/University of Arizona(米国)
• [Int'l Joint Research] Lillie University/Observatorie de Paris(フランス)
• [Int'l Joint Research] National Institute of astrophysics(イタリア)
• [Int'l Joint Research] Universite de Uppsala(スウェーデン)
• [Int'l Joint Research]
• [Int'l Joint Research] Lille University/Paris Observatory(フランス)
• [Int'l Joint Research] Observatory of Turin(イタリア)
• [Int'l Joint Research] Brown University/Purdue University/University of Arizona(米国)
• [Int'l Joint Research] National Central University, Taiwan(その他の国・地域)
• [Int'l Joint Research] Institute of Astronomy(ロシア連邦)
• [Int'l Joint Research] リール大学(フランス)
• [Int'l Joint Research] ソウル大学(韓国)
• [Int'l Joint Research] 國立中央大學(台灣)
• [Journal Article] Pluto near the edge of chaos (2022)
  • Author(s): Malhotra Renu、Ito Takashi
  • Journal Title: Proceedings of the National Academy of Sciences Volume: 119 Issue: 15
  • DOI: 10.1073/pnas.2118692119
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids (2022)
  • Author(s): Chang Chan-Kao、Chen Ying-Tung、Fraser Wesley C.、Lehner Matthew J.、Wang Shiang-Yu、Alexandersen Mike、Choi Young-Jun、Granados Contreras A. Paula、Ito Takashi、(この間に16名)、Yoshida Fumi、他2名
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 259 Issue: 1 Pages: 7-7
  • DOI: 10.3847/1538-4365/ac50ac
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Polarimetric properties of the near-Sun asteroid (155140) 2005 UD in comparison with other asteroids and meteoritic samples (2021)
  • Author(s): Ishiguro Masateru、Bach Yoonsoo P、Geem Jooyeon、Naito Hiroyuki、Kuroda Daisuke、Im Myungshin、Lee Myung Gyoon、Seo Jinguk、Jin Sunho、Kwon Yuna G、Oono Tatsuharu、Takagi Seiko、Sato Mitsuteru、Kuramoto Kiyoshi、Ito Takashi、Hasegawa Sunao、Yoshida Fumi、他12名
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 509 Issue: 3 Pages: 4128-4142
  • DOI: 10.1093/mnras/stab3198
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] FOSSIL. I. The Spin Rate Limit of Jupiter Trojans (2021)
  • Author(s): Chang Chan-Kao、Chen Ying-Tung、Fraser Wesley C.、Yoshida Fumi、Lehner Matthew J.、Wang Shiang-Yu、Kavelaars JJ、Pike Rosemary E.、Alexandersen Mike、Ito Takashi、他18名
  • Journal Title: The Planetary Science Journal Volume: 2 Issue: 5 Pages: 191-191
  • DOI: 10.3847/psj/ac13a4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Full rotationally phase-resolved visible reflectance spectroscopy of 3200 Phaethon (2020)
  • Author(s): Katsuhito Ohtsuka, Takashi Ito, Daisuke Kinoshita, Shinsuke Abe, Kyosuke Sawai, Kazuhiro Funabashi, Ryo Kato, Seidai Miyasaka, Sunao Hasegawa, Tomoki Nakamura, Wen-Ping Chen
  • Journal Title: Planetary and Space Science Volume: 191 Pages: 104940-104940
  • DOI: 10.1016/j.pss.2020.104940
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The Lidov-Kozai oscillation and Hugo von Zeipel (2019)
  • Author(s): Takashi Ito and Katsuhito Ohtsuka
  • Journal Title: Monogr. Environ. Earth Planets Volume: 7 Pages: 1-113
  • NAID: 40022680582
  • Peer Reviewed / Open Access
• [Journal Article] Constraining the formation of the four terrestrial planets in the solar system (2019)
  • Author(s): Patryk Sofia Lykawka and Takashi Ito
  • Journal Title: Astrophys. J. Volume: 883 Issue: 2 Pages: 130-130
  • DOI: 10.3847/1538-4357/ab3b0a
  • Peer Reviewed
• [Journal Article] Chaos in the inert Oort cloud (2019)
  • Author(s): Melaine Saillenfest, Marc Fouchard, Takashi Ito, Arika Higuchi
  • Journal Title: Astron. Astrophys. Volume: 629 Pages: A95-A95
  • DOI: 10.1051/0004-6361/201936298
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Q-type asteroids: Possibility of non-fresh weathered surfaces (2019)
  • Author(s): Hasegawa, S., Hiroi, T., Ohtsuka, K., Ishiguro, M., Kuroda, D., Ito, T., Sasaki, S.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 71 Issue: 5 Pages: 103-103
  • DOI: 10.1093/pasj/psz088
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 活動的小惑星の理解に向けて (2019)
  • Author(s): 脇田茂・瀧哲朗・伊藤孝士
  • Journal Title: 遊・星・人 (日本惑星科学会誌) Volume: 28 Pages: 124-139
  • NAID: 130007790063
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A comparative study of size frequency distributions of Jupiter Trojans, Hildas and main belt asteroids: A clue to planet migration history (2019)
  • Author(s): Fumi Yoshida, Tsuyoshi Terai, Takashi Ito, Keiji Ohtsuki, Patryk Sofia Lykawka, Takahiro Hiroi, Naruhisa Takato
  • Journal Title: Planetary and Space Science Volume: 169 Pages: 78-85
  • DOI: 10.1016/j.pss.2019.02.003
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A concept of hazardous NEO detection and impact warning system (2019)
  • Author(s): Toshinori Ikenaga, Yohei Sugimoto, Matteo Ceriotti, Makoto Yoshikawa, Toshifumi Yanagisawa, Hitoshi Ikeda, Nobuaki Ishii, Takashi Ito, Masayoshi Utashima
  • Journal Title: Acta Astronautica Volume: 156 Pages: 284-296
  • DOI: 10.1016/j.actaastro.2018.06.058
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Extremely strong polarization of an active asteroid (3200) Phaethon (2018)
  • Author(s): Takashi Ito, Masateru Ishiguro, Tomoko Arai, Masataka Imai, Tomohiko Sekiguchi, Yoonsoo P. Bach, Yuna G. Kwon, Masanori Kobayashi, Ryo Ishimaru, Hiroyuki Naito, Makoto Watanabe, and Kiyoshi Kuramoto
  • Journal Title: Nature Communications Volume: 9 Issue: 1 Pages: 2486-2486
  • DOI: 10.1038/s41467-018-04727-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The 'memory' of the Oort cloud (2018)
  • Author(s): Marc Fouchard, Arika Higuchi, Takashi Ito, Maquet Lucie
  • Journal Title: Astronomy & Astrophysics Volume: 620 Pages: A45-A45
  • DOI: 10.1051/0004-6361/201833435
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Optical observations of NEA 3200 Phaethon (1983 TB) during the 2017 apparition (2018)
  • Author(s): M.-J.Kim, H.-J.Lee, S.-M.Lee, D.-H.Kim, S.-M.Lee, F.Yoshida, P.Bartczak, G.Dudzinski, J.Park, Y.-J.Choi, H.-K.Moon, H.-S.Yim, J.Choi, E.-J.Choi, J.-N.Yoon, A.Serebryanskiy, M.Krugov, I.Reva, K.E.Ergashev, O.Burkhonov, S.A.Ehgamberdiev, Y.Turayev, Z.-Y.Lin, T.Arai, K.Ohtsuka, T.Ito, S.Urakawa, and M.Ishiguro
  • Journal Title: Astronomy & Astrophysics Volume: 619 Pages: A123-A123
  • DOI: 10.1051/0004-6361/201833593
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] A successful machine learning approach to detecting Kuiper Belt Objects for NASA's New Horizons Extended Mission (2022)
  • Author(s): Wesley C Fraser、JJ. Kavelaars、Lowell Peltier、Simon Porter、Hsing Wen Lin、John Spencer、Anne Verbiscer、Fumi Yoshida、Takashi Ito、他16名と1チーム
  • Organizer: 53rd Lunar and Planetary Science Conference (LPSC)
  • Int'l Joint Research
• [Presentation] A machine learning approach to detecting Kuiper Belt Objects for NASA's New Horizons Extended Mission (2022)
  • Author(s): Wesley C Fraser、JJ. Kavelaars、Simon Porter、Hsing Wen Lin、John Spencer、Anne Verbiscer、Fumi Yoshida、Takashi Ito、他8名と2チーム
  • Organizer: Subaru Users Meeting FY2021
  • Int'l Joint Research
• [Presentation] The New Horizons search for distant KBOs (2022)
  • Author(s): JJ Kavelaars、Wesley C Fraser、Simon Porter、Hsing Wen Lin、John Spencer、Anne Verbiscer、Fumi Yoshida、Takashi Ito、他8名と1チーム
  • Organizer: Subaru Users Meeting FY2021
  • Int'l Joint Research
• [Presentation] Comparison of original orbits of Oort Cloud new comets given in various catalogues II. Different solutions from different observations (2021)
  • Author(s): Takashi Ito
  • Organizer: JpGU Meeting 2021
  • Int'l Joint Research
• [Presentation] オールト雲起源新彗星の力学進化 10. 他の小天体群への遷移 (2021)
  • Author(s): 伊藤孝士, 樋口有理可
  • Organizer: 日本惑星科学会2021年秋季講演会
• [Presentation] Current status of DESTINY+ and updated understanding of its target asteroid (3200) Phaethon (2021)
  • Author(s): T. Arai, F. Yoshida, M. Kobayashi, K. Ishibashi, H. Kimura, T. Hirai, P. Hong, K. Wada, H. Senshu, M. Yamada, R. Srama, H. Kruger, M. Ishiguro, H. Yabuta, T. Nakamura, S. Kobayashi, J. Watanabe, Takashi Ito, T., and 28 more
  • Organizer: 52th Lunar and Planetary Science Conference, 15-19 March, 2021, Virtual Conference (LPI Contribution no. 2548)
  • Int'l Joint Research
• [Presentation] Dynamical lifetime of the Oort Cloud new comets under planetary perturbation (2020)
  • Author(s): Takashi Ito and Arika Higuchi
  • Organizer: DPS/AAS (AAS Division for Planetary Sciences) 52nd Annual Meeting, Virtual, 2020 October 26-30, 304.07
  • Int'l Joint Research
• [Presentation] Phase curves of > 40,000 small solar system bodies obtained by the Tomo-e Gozen transient survey (2020)
  • Author(s): Fumi Yoshida, Takashi Ito, Seitaro Urakawa, Tsuyoshi Terai, Nozomu Tominaga, Tomoki Morokuma, Shigeyuki Sako, Ryou Ohsawa, Masaomi Tanaka, Ryo Hamasaki, Tomo-e Gozen collaboration
  • Organizer: DPS/AAS (AAS Division for Planetary Sciences) 52nd Annual Meeting, Virtual, 2020 October 26-30, 208.06
  • Int'l Joint Research
• [Presentation] The Lidov-Kozai oscillation and Hugo von Zeipel (2020)
  • Author(s): Takashi Ito and Katsuhito Ohtsuka
  • Organizer: EPSC 2020, held 21 September - 9 October 2020, Virtual, EPSC2020-269
  • Int'l Joint Research
• [Presentation] Comparison of original orbits of Oort Cloud new comets given in various catalogues (2020)
  • Author(s): Takashi Ito and Arika Higuchi
  • Organizer: JpGU-AGU Joint Meeting 2020: Virtual, July 12-16, 2020, PPS07-P22
  • Int'l Joint Research
• [Presentation] Observation of dark comets using Subaru Telescope (2019)
  • Author(s): Takashi Ito
  • Organizer: The outer solar system: dynamics, formation and observation, held 28-30 October 2019 at University of Turin, Turin, Italy.
  • Int'l Joint Research / Invited
• [Presentation] The different catalogues of comets (2019)
  • Author(s): Takashi Ito
  • Organizer: The outer solar system: dynamics, formation and observation, held 28-30 October 2019 at University of Turin, Turin, Italy.
  • Int'l Joint Research / Invited
• [Presentation] Looking for a primordial fingerprint in known Long Period Comets (2019)
  • Author(s): Arika Higuchi, Marc Fouchard, Takashi Ito, and Lucie Maquet
  • Organizer: EPSC-DPS Joint Meeting 2019, held 15-20 September 2019 at Centre International de Conferences de Geneve (CICG), Geneva, Switzerland, EPSC-DPS2019-1432
  • Int'l Joint Research
• [Presentation] 長周期彗星の分布を用いたオール卜雲形成仮説の検証 (2019)
  • Author(s): 樋口有理可・伊藤孝士・Marc Fouchard・Melaine Saillenfest・Lucie Maquet
  • Organizer: 日本惑星科学会2019年秋季講演会, O70, 2019年10月7日(月)-9日(水), 京都産業大学 神山ホール.
• [Presentation] lifetime of the Oort Cloud new comets under planetary perturbation (2019)
  • Author(s): Takashi Ito, Arika Higuchi
  • Organizer: 日本地球惑星科学連合2019年大会, PPS03-P05, 2019年5月29日(水) 15:30-17:00 ポスター会場 (幕張メッセ国際展示場 8ホール), 全開催期間 2019年5月26-30日.
  • Int'l Joint Research
• [Presentation] 2016年秋の(3200) Phaethon偏光観測結果 (2018)
  • Author(s): 伊藤孝士、石黒正晃、荒井朋子、今井正尭、関口朋彦、Bach Yoonsoo P.、Kwon Yuna G.、小林正規、石丸亮、内藤博之、渡辺誠、倉本圭
  • Organizer: 日本地球惑星科学連合2018年大会
  • Int'l Joint Research