Investigation of Compositions of Insterplanetary Dust by Spectroscopic Video Observation
| Project/Area Number |
18K13599
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 17010:Space and planetary sciences-related
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| Research Institution | The University of Tokyo |
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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)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| 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)
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| 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 |
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| 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.
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| 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．
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Report
(5 results)
Research Products
(20 results)
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[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.
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Journal Title
Planetary and Space Science
Volume: 194
Pages: 105011-105011
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[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.
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 72
Issue: 1
Pages: 3-3
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[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
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[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
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[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
Int'l Joint Research / Invited
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