Morphology of ejecta features from the impact on asteroid Dimorphos

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Ferrari, Fabio, Panicucci, Paolo, Merisio, Gianmario, Giordano, Carmine, Pugliatti, Mattia, Li, Jian-Yang, Fahnestock, Eugene G, Raducan, Sabina D, Jutzi, Martin, Soldini, Stefania ORCID: 0000-0003-3121-3845 et al (show 23 more authors) , Hirabayashi, Masatoshi, Merrill, Colby C, Michel, Patrick, Moreno, Fernando, Tancredi, Gonzalo, Sunshine, Jessica M, Ormo, Jens, Herreros, Isabel, Agrusa, Harrison, Karatekin, Ozgur, Zhang, Yun, Chabot, Nancy L, Cheng, Andrew F, Richardson, Derek C, Rivkin, Andrew S, Campo Bagatin, Adriano, Farnham, Tony L, Ivanovski, Stavro, Lucchetti, Alice, Pajola, Maurizio, Rossi, Alessandro, Scheeres, Daniel J and Tusberti, Filippo (2025) Morphology of ejecta features from the impact on asteroid Dimorphos NATURE COMMUNICATIONS, 16 (1). 1601-. ISSN 2041-1723, 2041-1723

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Abstract

Hypervelocity impacts play a significant role in the evolution of asteroids, causing material to be ejected and partially reaccreted. However, the dynamics and evolution of ejected material in a binary asteroid system have never been observed directly. Observations of Double Asteroid Redirection Test (DART) impact on asteroid Dimorphos have revealed features on a scale of thousands of kilometers, including curved ejecta streams and a tail bifurcation originating from the Didymos system. Here we show that these features result naturally from the dynamical interaction of the ejecta with the binary system and solar radiation pressure. These mechanisms may be used to constrain the orbit of a secondary body, or to investigate the binary nature of an asteroid. Also, they may reveal breakup or fission events in active asteroids, and help determine the asteroid’s properties following an impact event. In the case of DART, our findings suggest that Dimorphos is a very weak, rubble-pile asteroid, with an ejecta mass estimated to be in the range of (1.1-5.5)×10⁷kg.

Item Type:	Article
Uncontrolled Keywords:	37 Earth Sciences, 51 Physical Sciences, 5109 Space Sciences, 3705 Geology
Divisions:	Faculty of Science & Engineering Faculty of Science & Engineering > School of Engineering
Depositing User:	Symplectic Admin
Date Deposited:	25 Mar 2025 10:41
Last Modified:	16 Jun 2026 20:22
DOI:	10.1038/s41467-025-56551-0
Open Access URL:	https://doi.org/10.1038/s41467-025-56551-0
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3190987
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