[P-PS02] [EE] Small Bodies: Exploration of the Asteroid Belt and the Solar System at Large

[PPS02-32] DESTINY⁺ mission: Flyby to Meteor Shower Parent Bodies

*Tomoko Arai¹, Masanori Kobayashi¹, Ko Ishibashi¹, Shingo Kameda³, Hiroki Senshu¹, Koji Wada¹, Jun-ichi Watanabe², Takashi Ito², MASATERU ISHIGURO⁴, Katsuhito Ohtsuka⁵, Seitaro Urakawa⁶, Shinsuke Abe⁷, Tomohiko Sekiguchi⁸, Daisuke Kinoshita⁹, Makoto Yoshikawa¹⁰, Keiko Nakamura-Messenger¹¹, Hikaru Yabuta¹², Sho Sasaki¹³, Hiroshi Kimura¹⁴, Tomoki Nakamura¹⁵, Aiko Nakato¹⁶, Mutsumi Komatsu²⁰, Takashi Mikouchi¹⁸, Shogo Tachibana²¹, Takahiro Hiroi¹⁷, Hajime Yano¹⁰, Mikiya Sato²⁴, Noriyuki Namiki², Ralph Srama²², Harald Kruger²³, Manabu Yamada¹, Ryu Funase¹⁸, Satoshi Ikari¹⁸, Naoya Ozaki¹⁸, Takaya Inamori¹⁹, Bruno Sarli¹⁰, Takahiro Iwata¹⁰, Tatsuaki Okada¹⁰, Hiroyuki Toyota¹⁰, Kazutaka Nishiyama¹⁰, Yasuhiro Kawakatsu¹⁰ (1.Planetary Exploration Research Center, Chiba Institute of Technology, 2.National Astronomical Observatory of Japan, 3.Rikkyo University, 4.Seoul National University, 5.Tokyo Meteor Network, 6.Japan Spaceguard Association, 7.Nihon University, 8.Hokkaido University of Education, 9.Taiwan National Central University, 10.Japan Aerospace Exploration Agency, 11.National Aeronautics and Space Administration , 12.Hiroshima University, 13.Osaka University, 14.Kobe University, 15.Tohoku University, 16.Kyoto University, 17.Brown University, 18.The University of Tokyo, 19.Nagoya University, 20.The Graduate University for Advanced Studies, 21.Hokkaido University, 22.University of Stuttgart, 23.Max Planck Institute, 24.Kawasaki Municipal Science Museum)

Keywords:Flyby, Meteor shower parent bodies, Interplanetary dust particles

About 40,000 metric tons per year of extraterrestrial materials enters the atmosphere and eventually reaches the ground. This extraterrestrial materials are derived either from cosmic dust background or from meteor showers. The former consists mostly of interplanetary dust and with minor interstellar dust. The latter are meteoroids generated from breakup of comets and asteroids. Parent bodies which are dynamically linked with major annual meteor showers have been identified. Meteoroid dusts are rare and important extraterrestrial matters of which origins are identified. Asteroid 3200 Phaethon is a parent body of the Geminids meteor shower, which is among the most active meteor showers. While most of the parent bodies of meteor showers are comets, cometary activity of Phaethon has only been reported near its perihelion at 0.14 AU. Phaethon is likely a comet to asteroid transitional body. Depletion of sodium, which is a moderately volatile element, and high dust density (about 2.9 g/cm³), relative to other meteor showers are reported from spectroscopic study of the Geminids meteoroid. Because of its small perihelion distance, dehydration of the surface material by solar heating is expected, but some primitive, hydrous material may still reside in its interior. Phaethon is an ideal body to understand the origin of meteoroid dusts and thermal evolution of primitive bodies in the near-Earth orbit. Also, Phaethon is the largest body among potentially hazardous asteroids (PHAs), of which cross the Earth`s orbit. Thus, Phaethon is a critical mission target both in the context of science and planetary defense. Here, we presents a flyby mission to Phaethon and its related asteroids with DESTINY⁺.