Mechanical properties of rubble pile asteroids (Dimorphos, Itokawa, Ryugu, and Bennu) through surface boulder morphological analysis - Archive ouverte HAL
Article Dans Une Revue Nature Communications Année : 2024

Mechanical properties of rubble pile asteroids (Dimorphos, Itokawa, Ryugu, and Bennu) through surface boulder morphological analysis

Jean-Baptiste Vincent
Alice Lucchetti
Maurizio Pajola
Carolyn M Ernst
R. Terik Daly
Olivier S Barnouin
Sabina D Raducan
Masatochi Hirabayashi
Alexander Stott
Gabriela Cuervo
  • Fonction : Auteur
Erica R Jawin
  • Fonction : Auteur
Josep M Trigo-Rodriguez
Laura M Parro
Cecily Sunday
  • Fonction : Auteur
Andrew S Rivkin
Nancy L Chabot

Résumé

Planetary defense efforts rely on estimates of the mechanical properties of asteroids, which are difficult to constrain accurately from Earth. The mechanical properties of asteroid material are also important in the interpretation of the Double Asteroid Redirection Test (DART) impact. Here we perform a detailed morphological analysis of the surface boulders on Dimorphos using images, the primary data set available from the DART mission. We estimate the bulk angle of internal friction of the boulders to be 32.7 ± 2. 5° from our measurements of the roundness of the 34 best-resolved boulders ranging in size from 1.67–6.64 m. The elongated nature of the boulders around the DART impact site implies that they were likely formed through impact processing. Finally, we find striking similarities in the morphology of the boulders on Dimorphos with those on other rubble pile asteroids (Itokawa, Ryugu and Bennu). This leads to very similar internal friction angles across the four bodies and suggests that a common formation mechanism has shaped the boulders. Our results provide key inputs for understanding the DART impact and for improving our knowledge about the physical properties, the formation and the evolution of both near-Earth rubble-pile and binary asteroids.
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hal-04668469 , version 1 (06-08-2024)

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Colas Q Robin, Alexia Duchene, Naomi Murdoch, Jean-Baptiste Vincent, Alice Lucchetti, et al.. Mechanical properties of rubble pile asteroids (Dimorphos, Itokawa, Ryugu, and Bennu) through surface boulder morphological analysis. Nature Communications, 2024, 15 (1), pp.6203. ⟨10.1038/s41467-024-50147-w⟩. ⟨hal-04668469⟩
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