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Physical Analysis of Bennu Samples Reveals Regolith Production by Collisional Disruption on Near-Earth Asteroids

  • Authors: R.-L. Ballouz, A. J. Ryan, R. J. Macke, O. S. Barnouin, M. Lê, J. Moreno, S. Eckley, L. Hanton, A. Hildebrand, V. Toy-Edens, R. M. Meier, M. Berkson, E. Asphaug, S. Cambioni, C. G. Hoover, K. Jardine, E.R. Jawin, N. Lunning, J. L. Molaro, M. Pajola, K. Righter, K. T. Ramesh, F. Tusberti, K. J. Walsh, C. W. V. Wolner, D. N. DellaGiustina, H. C. Connolly, D. S. Lauretta

R.-L. Ballouz et al 2026 The Planetary Science Journal 7 .

  • Provider: AAS Journals

Caption: Figure 2.

Fraction of ejected mass retained, M(v < vesc), from cratering impacts into material with strength Y, and assuming material constants similar to that of weakly cemented basalt, cs = 0.122 and β = 1 (A. M. Nakamura 2017), for ρ = 1.8 g cm−3. The cyan, magenta, yellow, and black dashed curves show M(v < vesc) for vesc = 0.2, 0.5, 2.0, and 5.0 m s−1. The escape speeds for Bennu and Ryugu range from 0.2 to 0.5 m s−1. Cratering impacts into Bennu and Ryugu boulders, which have an estimated Y ∼ 0.2–2 MPa (R.-L. Ballouz et al. 2020), would lead to all of the fragments escaping the asteroid.

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