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Investigation of Compositions of Insterplanetary Dust by Spectroscopic Video Observation

Research Project

Project/Area Number 18K13599
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 17010:Space and planetary sciences-related
Research InstitutionThe University of Tokyo

Principal Investigator

Ohsawa Ryou  東京大学, 大学院理学系研究科(理学部), 特任助教 (40748696)

Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2021: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords流星 / 惑星間空間ダスト / 広視野動画観測 / 広視野カメラ / 動画天文学 / 惑星間塵 / 分光学
Outline of Final Research Achievements

This project aims to establish a method to conduct a spectroscopic observation of faint meteors using a 1-m class telescope and a high-sensitivity video camera, to inspect the compositions of dust grains in the interplanetary space. We use the Tomo-e Gozen camera in Kiso Observatory, the University of Tokyo. An optical filter holder is developed for multicolor and spectroscopic observations with Tomo-e Gozen, and data reduction software is prepared to extract faint meteors from video data. Observation programs of faint meteors have been conducted. We confirm that Tomo-e Gozen can detect faint meteors down to 10th mag. in optical wavelengths. A luminosity function and meteor influx to the Earth are constrained.

Academic Significance and Societal Importance of the Research Achievements

地球をとりまく空間には微小な固体物質(ダスト粒子)が存在しており,地球表面に絶えず流入し続けている.ダストは小惑星や彗星と行った太陽系小天体を起源としており,ダストの性質や起源を理解することは地球と宇宙の関わりを明らかにするとともに,太陽系の起源に迫るための情報を提供する.流星観測はダストを研究する重要な観測手法であるが,観測装置の感度限界から地球に流入する質量の大半を占める微細なダストの観測は困難だった.本研究では望遠鏡と高感度ビデオカメラによる流星観測手法を確立し,微細なダストの性質を調べるに足る感度を達成していることを実証した.流星観測からダスト粒子組成を解明するための道筋を確立した.

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (20 results)

All 2020 2019 2018 Other

All Int'l Joint Research (4 results) Journal Article (5 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (9 results) (of which Int'l Joint Research: 6 results,  Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] Swedish Institute of Space Physics(スウェーデン)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Swedish Institute of Space Physics(スウェーデン)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Swedith Institute of Space Physics(スウェーデン)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Swedish Institute of Space Physics(スウェーデン)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Relationship between radar cross section and optical magnitude based on radar and optical simultaneous observations of faint meteors2020

    • Author(s)
      R. Ohsawa, A. Hirota, K. Morita, S. Abe, D. Kastinen, J. Kero, C. Szasz, Y. Fujiwara, T. Nakamura, K. Nishimura, S. Sako, J. Watanabe, et al.
    • Journal Title

      Planetary and Space Science

      Volume: 194 Pages: 105011-105011

    • DOI

      10.1016/j.pss.2020.105011

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evidence for a rapid decrease of Pluto’s atmospheric pressure revealed by a stellar occultation in 20192020

    • Author(s)
      K. Arimatsu, G. L. Hashimoto, M. Kagitani, T. Sakanoi, Y. Kasaba, R. Ohsawa, S. Urakawa
    • Journal Title

      Astronomy & Astrophysics

      Volume: 638 Pages: L5-L5

    • DOI

      10.1051/0004-6361/202037762

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] An optical search for transients lasting a few seconds2019

    • Author(s)
      Michael W. Richmond, Masaomi Tanaka, Tomoki Morokuma, Shigeyki Sako, Ryou Ohsawa, Noriaki Arima, Nozomu Tominaga, Mamoru Doi, et al.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 72 Issue: 1 Pages: 3-3

    • DOI

      10.1093/pasj/psz120

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] New Constraint on the Atmosphere of (50000) Quaoar from a Stellar Occultation2019

    • Author(s)
      Ko Arimatsu, Ryou Ohsawa, George L. Hashimoto, Seitaro Urakawa, Jun Takahashi, Miyako Tozuka, Yoichi Itoh, Misato Yamashita, et al.
    • Journal Title

      The Astronomical Journal

      Volume: 158 Issue: 6 Pages: 236-236

    • DOI

      10.3847/1538-3881/ab5058

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Luminosity function of faint sporadic meteors measured with a wide-field CMOS mosaic camera Tomo-e PM2019

    • Author(s)
      Ohsawa Ryou, Toshikazu Shigeyama (26/37) et al.
    • Journal Title

      Planetary and Space Science

      Volume: 165 Pages: 281-292

    • DOI

      10.1016/j.pss.2018.09.006

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Near-Earth Asteroid Survey with Tomo-e Gozen2020

    • Author(s)
      Ryou Ohsawa, Jin Beniyama, Shigeyuki Sako, Seitaro Urakawa, Shin-ichiro Okumura, Jun-ichi Watanabe, Makoto Yoshikawa, Tomoki Morokuma
    • Organizer
      JpGU-AGU Joint Meeting 2020: Virtual
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 大澤亮, 森田晃平, 阿部新助, Daniel Kastinen, Johan Kero, 藤原康徳, 中村卓司, 西村耕司, 酒向重行, 渡部潤一 , Tomo-e Gozen Science Working Group メンバー2020

    • Author(s)
      MU レーダと Tomo-e Gozen による微光流星同時観測
    • Organizer
      日本天文学会 2020 年春季年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Radar and optical simultaneous observations of faint meteors with MU radar and Tomo-e Gozen2019

    • Author(s)
      Ryou Ohsawa, Akira Hirota, Shinsuke Abe, Daniel Kastinen, Johan Kero, Shigeyuki Sako, Jun-ichi Watanabe
    • Organizer
      Japan Geoscience Union Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Radar and optical simultaneous observations of faint meteors with MU radar and Tomo-e Gozen2019

    • Author(s)
      Ryou Ohsawa, Akira Hirota, Kohei Morita, Shinsuke Abe, Daniel Kastinen, Johan Kero, Takuji Nakamura, Koji Nishimura, Shigeyuki Sako, and Jun-ichi Watanabe
    • Organizer
      Meteoroids 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 京都大学 MU レーダと東京大学木曽観測所 {Tomo-e~Gozen} による微光流星同時 観測2019

    • Author(s)
      大澤亮, 弘田旭, 森田晃平, 阿部新助, Daniel Kastinen, Johan Kero, 藤原康徳, 中村卓司, 西村耕司, 酒向重行, 渡部潤一
    • Organizer
      日本惑星科学会 2019 年秋季講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] All Sky Survey and Meteor Observations with Tomo-e Gozen2018

    • Author(s)
      Ryou Ohsawa
    • Organizer
      9th Workshop on Catastrophic Disruption in the Solar System
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Video Observations of Faint Meteors with Tomo-e PM2018

    • Author(s)
      Ryou Ohsawa, et al.
    • Organizer
      日本地球惑星科学連合 2018 年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Optical Observations of Faint Meteors with a Wide-Field CMOS Camera Tomo-e Gozen2018

    • Author(s)
      Ryou Ohsawa, Shigeyuki Sako, Fumihiko Usui, Yuki Sarugaku, Mikiya Sato, Yasunori Fujiwara, Takafumi Ootsubo, Shinsuke Abe, Akira Hirota, Ko Arimatsu, Toshihiro Kasuga, Jun-ichi Watanabe, and Tomo-e Gozen Science Group
    • Organizer
      45th Annual European Meeting on Atmospheric Studies by Optical Methods
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 東京大学木曽観測所広視野 CMOS モザイクカメラ Tomo-e Gozen による人工天体の観測2018

    • Author(s)
      大澤亮, 酒向重行, 小島悠人, 奥村真一郎, 浦川聖太郎, 柳澤俊史, 吉川真, Tomo-e Gozen サイエンスグループ
    • Organizer
      第 8 回 スペースデブリワークショップ
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Remarks] 東京大学木曽観測所トモエゴゼンと京都大学生存圏研究所MUレーダーによって微光流星の同時観測に成功

    • URL

      https://www.s.u-tokyo.ac.jp/ja/press/2020/7097/

    • Related Report
      2020 Research-status Report
  • [Remarks] Weighing space dust with radar

    • URL

      https://www.u-tokyo.ac.jp/focus/en/press/z0508_00143.html

    • Related Report
      2020 Research-status Report

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Published: 2018-04-23   Modified: 2023-01-30  

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