Japan Geoscience Union Meeting 2023

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[E] Oral

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

[P-PS03] Small Solar System Bodies: New perspectives on the origin and evolution of the Solar System

Wed. May 24, 2023 3:30 PM - 4:45 PM 301A (International Conference Hall, Makuhari Messe)

convener:Tatsuaki Okada(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Fumi Yoshida(University of Occupational and Environmental Health, Japan), Sota Arakawa(Japan Agency for Marine-Earth Science and Technology), Ryota Fukai(Japan Aerospace Exploration Agency), Chairperson:Fumi Yoshida(University of Occupational and Environmental Health, Japan), Tatsuaki Okada(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Sota Arakawa(Japan Agency for Marine-Earth Science and Technology), Ryota Fukai(Japan Aerospace Exploration Agency)


4:30 PM - 4:45 PM

[PPS03-22] The discovery of the source of the EL meteorites.

*Chrysa Avdellidou1, Marco Delbo1, Alessandro Morbidelli1, Kevin J. Walsh2, Edhah Munaibari1, Joules Bourdelle de Micas3, Maxime Devogele4, Sonia Fornasier3, Matthiew Gounelle5, Gerard van Belle6 (1.Observatoire de la Cote dAzur, 2.Southwest Research Institute, 3.LESIA, Observatoire de Paris, MEUDON, 4.Arecibo Observatory, 5.Museum National dHistoire Naturelle, 6.Lowell Observatory)

Keywords:asteroid families, enstatite meteorites, spectroscopy

The identification of meteorite parent bodies provides the context for understanding planetesimal formation and evolution as well as the key Solar System events they have witnessed. We identified that the asteroid family of Athor that is located in the inner main belt is the unique source of the rare EL enstatite chondrite meteorites. EL meteorites are closest meteorites to Earth in terms of their isotopic ratios. The Athor family was created by the collisional fragmentation of a parent body 3 Gyr ago in the inner main belt. We calculate that the diameter of the Athor family progenitor was 64 km in diameter, much smaller than the putative size of the EL original planetesimal. Therefore, we deduce that the EL planetesimal that accreted in the terrestrial planet region underwent a first catastrophic collision in that region, and one of its fragments suffered a more recent catastrophic collision in the main belt, generating the current source of the EL meteorites.