日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 P (宇宙惑星科学) » P-PS 惑星科学

[P-PS03] Solar System Small Bodies: A New Frontier Arising Hayabusa 2, OSIRIS-REx and Other Projects

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)

コンビーナ:石黒 正晃(ソウル大学物理天文学科)、中本 泰史(東京工業大学)、安部 正真(宇宙航空研究開発機構宇宙科学研究所)、Olivier S Barnouin(Johns Hopkins University Applied Physics Laboratory)

[PPS03-P15] Radar and optical simultaneous observations of faint meteors with MU radar and Tomo-e Gozen

*大澤 亮1弘田 旭2阿部 新助2Kastinen Daniel3Kero Johan3藤原 康徳4中村 卓司5酒向 重行1小島 悠人1渡部 潤一6 (1.東京大学大学院理学系研究科 天文学教育研究センター、2.日本大学理工学部 航空宇宙工学科、3.Institutet för rymdfysik、4.総合研究大学院大学、5.国立極地研究所、6.国立天文台)

キーワード:流星、惑星間空間ダスト

The Earth is surrounded by small dust grains produced by comets and asteroids. Tons of such grains plunge into the Earth's atmosphere hourly. Part of their kinetic energy excites and ionizes the surrounding atmosphere, which is observed as a meteor phenomenon. A simultaneous radar and optical observation is promising to constrain the motion and mass of a meteor at a time. We launched a project to observe faint meteors with Middle and Upper Atmosphere Radar (MU radar) and a wide-field CMOS mosaic camera Tomo-e Gozen installed on the 105 cm Kiso Schmidt telescope. The observations were carried out in 18--21, April, 2018. From tons of the detected meteors, the simultaneous detections were extracted in terms of the times, loci, and directions of the meteors. Finally, we identified the 894 meteor events simultaneously detected in the both sites. The optical brightness of the simultaneous meteors ranged from about 3--11 mag. in the V-band, which is about 5 magnitude fainter than in previous studies. We confirmed a clear correlation between the meteor brightnesses and the radar cross sections.