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Article Dans Une Revue Nature Communications Année : 2024

The geology and evolution of the Near-Earth binary asteroid system (65803) Didymos

Olivier Barnouin
Ronald-Louis Ballouz
Simone Marchi
Jean-Baptiste Vincent
Harrison Agrusa
Yun Zhang
Carolyn M Ernst
Maurizio Pajola
Filippo Tusberti
Alice Lucchetti
R. Terik Daly
Eric Palmer
Kevin J Walsh
Patrick Michel
Jessica M Sunshine
Juan L Rizos
  • Fonction : Auteur
Tony L Farnham
Derek C Richardson
Laura M Parro
Naomi Murdoch
Colas Q Robin
  • Fonction : Auteur
Masatoshi Hirabayashi
Tomas Kahout
Erik Asphaug
  • Fonction : Auteur
Sabina D Raducan
Martin Jutzi
  • Fonction : Auteur
Fabio Ferrari
Adriano Campobagatin
Nancy L Chabot
Jian-Yang Li
Andrew F Cheng
Michael C Nolan
Angela M Stickle
  • Fonction : Auteur
Ozgur Karatekin
  • Fonction : Auteur
Elisabetta Dotto
Vincenzo Della Corte
  • Fonction : Auteur
Elena Mazzotta Epifani
Alessandro Rossi
Igor Gai
  • Fonction : Auteur
Ivano Bertini
  • Fonction : Auteur
Angelo Zinzi
Josep M Trigo-Rodriguez
Joel Beccarelli
  • Fonction : Auteur
Stavro Lambrov Ivanovski
  • Fonction : Auteur
John Robert Brucato
Giovanni Poggiali
Giovanni Zanotti
Marilena Amoroso
  • Fonction : Auteur
Andrea Capannolo
  • Fonction : Auteur
Gabriele Cremonese
  • Fonction : Auteur
Massimo Dall’ora
  • Fonction : Auteur
Simone Ieva
Gabriele Impresario
Michèle Lavagn
  • Fonction : Auteur
Dario Modenini
Pasquale Palumbo
  • Fonction : Auteur
Davide Perna
  • Fonction : Auteur
Simone Pirrotta
Paolo Tortora
Marco Zannoni
  • Fonction : Auteur
Andrew S Rivkin
  • Fonction : Auteur

Résumé

Images collected during NASA’s Double Asteroid Redirection Test (DART) mission provide the first resolved views of the Didymos binary asteroid system. These images reveal that the primary asteroid, Didymos, is flattened and has plausible undulations along its equatorial perimeter. At high elevations, its surface is rough and contains large boulders and craters; at low elevations its surface is smooth and possesses fewer large boulders and craters. Didymos’ moon, Dimorphos, possesses an intimate mixture of boulders, several asteroid-wide lineaments, and a handful of craters. The surfaces of both asteroids include boulders that are large relative to their host body, suggesting that both asteroids are rubble piles. Based on these observations, our models indicate that Didymos has a surface cohesion ≤ 1 Pa and an interior cohesion of ∼10 Pa, while Dimorphos has a surface cohesion of <0.9 Pa. Crater size-frequency analyzes indicate the surface age of Didymos is 40–130 times older than Dimorphos, with likely absolute ages of $$\sim$$ ~ 12.5 Myr and <0.3 Myr, respectively. Solar radiation could have increased Didymos’ spin rate leading to internal deformation and surface mass shedding, which likely created Dimorphos.
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hal-04668463 , version 1 (06-08-2024)

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Olivier Barnouin, Ronald-Louis Ballouz, Simone Marchi, Jean-Baptiste Vincent, Harrison Agrusa, et al.. The geology and evolution of the Near-Earth binary asteroid system (65803) Didymos. Nature Communications, 2024, 15 (1), pp.6202. ⟨10.1038/s41467-024-50146-x⟩. ⟨hal-04668463⟩
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