Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

P (Space and Planetary Sciences ) » P-PS Planetary Sciences

[P-PS02] Regolith Science

Wed. May 29, 2019 3:30 PM - 5:00 PM A01 (TOKYO BAY MAKUHARI HALL)

convener:Koji Wada(Planetary Exploration Research Center, Chiba Institute of Technology), Akiko Nakamura(Graduate School of Science, Kobe University), Patrick Michel(Observatoire De La Cote D'Azur), Kevin John Walsh(Southwest Research Institute Boulder), Chairperson:Akiko Nakamura(Graduate School of Science, Kobe University)

3:45 PM - 4:00 PM

[PPS02-08] On the Detection of an Ejecta Dust Cloud Around Asteroid (3200) Phaethon by the DESTINY+ Dust Analyzer

*Hiroshi Kimura1, Masanori Kobayashi1, Koji Wada1, Tomoko Arai1, Hiroki Senshu1, Masateru Ishiguro2, Hidekazu Hanayama3, Ko Ishibashi1, Takayuki Hirai1, Fumi Yoshida1, Peng Hong1 (1.Planetary Exploration Research Center, 2.Seoul National University, 3.Ishigakijima Astronomical Observatory)

Keywords:Asteroid (3200) Phaethon, ejecta dust cloud, DESTINY+

We will provide the most recent report on the detectability of an ejecta cloud around Asteroid (3200) Phaethon by the DESTINY+ Dust Analyzer (DDA), based on a model of dust dynamics in the cloud. We demonstrate that solar radiation pressure plays a vital role in shaping the spatial distribution of dust particles in Phaethon's ejecta cloud, because small particles, albeit the majority, are expelled from the sunward direction. We find that the DDA will have an opportunity of detecting dust particles in the ejecta cloud of Phaethon during a flyby, depending on the closest approach to the asteroid, heliocentric distance, and the initial velocity of ejecta. There are no hazard from impacts of 100 μm-sized ejecta particles that potentially could make tiny holes on the surface of the spacecraft during a flyby.