Observational and numerical studies of the dynamical origin of near-Earth asteroids

• Project/Area Number: 25400458
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Ito Takashi 国立天文台, 天文データセンター, 助教 (40280565)
• Co-Investigator(Kenkyū-buntansha): 吉田 二美 国立天文台, 国際連携室, 専門研究職員 (20399306)
• Co-Investigator(Renkei-kenkyūsha): Takeda Takaaki 国立天文台, 天文情報センター, 広報普及員 (70413961) ; Higuchi Arika 東京工業大学, 理工学研究科, 流動研究員 (90597139)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 小惑星 / 衝突破壊 / 天体力学 / クレーター / サイズ頻度分布 / オールト雲 / 破壊 / 太陽系力学 / 数値シミュレーション / 光度曲線 / 衝突 / 彗星

Outline of Final Research Achievements

We have investigated the dynamical origin of near-Earth asteroids both in numerical and observational ways. In our numerical study, a result of ours tells us that the Oort Cloud new comets coming from a very distant area outside of the planetary region is not negligible as a source region of the near-Earth asteroids. In our observational study, we have revealed that the rotational velocity distribution of collisional fragments (i.e. young family asteroid members) show certain trend with respect to their shape (i.e. peak to trough variation in their lightcurves). Asteroid families are direct consequence of collisions and disruptions in the solar system, and they have a large significance in understanding evolution processes of the near-Earth asteroids.

Research Products

• [Int'l Joint Research] National Central University(Taiwan)
• [Int'l Joint Research] Lille University(France)
• [Int'l Joint Research] ウルグベク天文研究所(ウズベキスタン)
• [Int'l Joint Research] アリゾナ大学(米国)
• [Int'l Joint Research] 國立中央大學(台灣)
• [Journal Article] Terrestrial Planet Formation: Constraining the Formation of Mercury (2017)
  • Author(s): Patryk Sofia Lykawka, Takashi Ito
  • Journal Title: The Astrophysical Journal Volume: 838 Issue: 2 Pages: 106-106
  • DOI: 10.3847/1538-4357/aa6544
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High-order analytic expansion of disturbing function for doubly averaged circular restricted three-body problem (2016)
  • Author(s): Takashi Ito
  • Journal Title: Advances in Astronomy Volume: 2016 Pages: 8945090-8945090
  • DOI: 10.1155/2016/8945090
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Lightcurves of the Karin family asteroids (2016)
  • Author(s): F. Yoshida, T. Ito, B. Dermawan, T. Nakamura, S. Takahashi, M. A. Ibrahimov, R. Malhotra, W.-H. Ip, W.-P. Chen, Y. Sawabe, M. Haji, R. Saito, M. Hirai
  • Journal Title: Icarus Volume: 269 Pages: 15-22
  • DOI: 10.1016/j.icarus.2016.01.004
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The inner solar system cratering record and the evolution of impactor populations (2015)
  • Author(s): Robert G. Strom, Renu Malhotra, Zhiyong Xiao, Takashi Ito, Fumi Yoshida, Lillian R. Ostrach
  • Journal Title: Research in Astronomy and Astrophysics Volume: 15 Issue: 3 Pages: 407-434
  • DOI: 10.1088/1674-4527/15/3/009
  • Peer Reviewed
• [Journal Article] 太陽系力学に於けるシンプレクティク数値積分 (2015)
  • Author(s): 伊藤孝士
  • Journal Title: プラズマ・核融合学会誌 Volume: 91 Pages: 149-153
  • Peer Reviewed
• [Journal Article] FAST ROTATION OF A SUBKILOMETER-SIZED NEAR-EARTH OBJECT 2011 XA3 (2014)
  • Author(s): Seitaro Urakawa, Katsuhito Ohtsuka, Shinsuke Abe, Takashi Ito, and Tomoki Nakamura
  • Journal Title: The Astronomical Journal Volume: 147 Issue: 5 Pages: 121-121
  • DOI: 10.1088/0004-6256/147/5/121
  • Peer Reviewed
• [Journal Article] Lightcurve of (4507) 1990FV (2013)
  • Author(s): Takashi Ito, Fumi Yoshida, Hideo Fukushima, Hideo Sato, Shigeru Takahashi, Tsuko Nakamura, Budi Dermawan, Seidai Miyasaka, Yusuke Sato, Wing-Huen Ip, Wen-Ping Chen
  • Journal Title: Minor Planet Bulletin Volume: 40 Pages: 206-207
  • Peer Reviewed
• [Journal Article] Terrestrial planet formation during the migration and resonance crossings of the giant planets (2013)
  • Author(s): Patryk Sofia Lykawka, Takashi Ito
  • Journal Title: Astrophys. J. Volume: 773 Issue: 1 Pages: 65-65
  • DOI: 10.1088/0004-637x/773/1/65
  • NAID: 40020196867
  • Peer Reviewed
• [Presentation] 近地球小天体の供給効率と分裂破壊の効果 (2015)
  • Author(s): 伊藤孝士
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ国際会議場（千葉県千葉市）
  • Year and Date: 2015-05-24
• [Presentation] Dynamical Behavior of the Oort Cloud New Comets in Planetary Region (2014)
  • Author(s): Takashi Ito and Arika Higuchi
  • Organizer: American Astronomical Society, DPS annual meeting #46
  • Place of Presentation: JW Marriott Starr Pass Tucson, AZ, USA
  • Year and Date: 2014-11-09 – 2014-11-14
• [Presentation] Dynamical Behavior of the Oort Cloud New Comets in Planetary Region (2014)
  • Author(s): Takashi Ito and Arika Higuchi
  • Organizer: Symposium for JSPS bilateral program (joint research projects and seminars)
  • Place of Presentation: National Astronomical Observatory, Osawa 2-21-1, Mitaka, Tokyo, Japan
  • Year and Date: 2014-10-21
• [Presentation] Dynamical evolution of the Oort cloud new comets (2014)
  • Author(s): Takashi Ito and Arika Higuchi
  • Organizer: Asia-Oceania Geoscience Society 11th Annual Meeting
  • Place of Presentation: Royton Sapporo Hotel, Sapporo, Japan
  • Year and Date: 2014-07-28 – 2014-08-01
• [Presentation] Dynamical lifetime of the Oort Cloud new comets under planetary perturbation (2014)
  • Author(s): Takashi Ito and Arika Higuchi
  • Organizer: Asteroids, Comets, Meteors (ACM) 2014
  • Place of Presentation: Marina Congress Center, Helsinki, Finland
  • Year and Date: 2014-06-30 – 2014-07-03
• [Presentation] Dynamical evolution of the Oort cloud new comets (2013)
  • Author(s): Takashi Ito, Arika Higuchi
  • Organizer: Asia-Oceania Geoscience Society 10th Annual Meeting
  • Place of Presentation: Brisbane Convention & Exhibition Centre, Brisbane, Australia
• [Presentation] Dynamical behavior of the Oort Cloud new comets in planetary region (2013)
  • Author(s): Takashi Ito, Arika Higuchi
  • Organizer: Takashi Ito and Arika Higuchi, "Dynamical behavior of the Oort Cloud new comets in planetary region", 2013 NCTS Taiwan-Japan Symposium on Celestial Mechanics and N-Body Dynamics
  • Place of Presentation: National Center for Theoretical Sciences, National Tsing Hua University, Hsinchu, TaiwanNational Center for Theoretical Sciences, National Tsing Hua University, Hsinchu, Taiwan