Subsurface pulse, crater and ejecta asymmetry from oblique impacts into granular media

Suo, Bingcheng; Quillen, A.C.; Neiderbach, Max; O’Brient, Luke; Miakhel, Abobakar Sediq; Skerrett, Nathan; Couturier, Jérémy; Lherm, Victor; Wang, Jiaxin; Askari, Hesam; Wright, Esteban; Sánchez, Paul

doi:10.1016/j.icarus.2023.115816

Icarus

2024

DOI: 10.1016/j.icarus.2023.115816

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Subsurface pulse, crater and ejecta asymmetry from oblique impacts into granular media

Bingcheng Suo,

A.C. Quillen,

Max Neiderbach

et al.

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Cited by 3 publications

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The effect of projectile nose shape on the formation and expansion of impact-induced ejecta for sand target

Zhang,

Chi,

Sun

et al. 2024

Acta Astronautica

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The effect of projectile nose shape on the formation and expansion of impact-induced ejecta for sand target

Zhang,

Chi,

Sun

et al. 2024

Acta Astronautica

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NcorpiON : A O(N) software for N-body integration in collisional and fragmenting systems

Couturier,

Quillen,

Nakajima

2025

New Astronomy

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Numerical Investigation of the Cohesive Strength Regime of the Bilobated Arrokoth after the Sky-crater-forming Impact Event

Kim,

Hirabayashi,

Bauer

2024

Planet. Sci. J.

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In 2019, NASA’s New Horizons mission, using the Long Range Reconnaissance Imager, revealed Arrokoth’s bilobated shape and a large impact-crater-like region (“Sky”) on the small lobe, which is ∼7 km wide and ∼1 km deep. Given that this depression takes up ∼7% of the entire volume of the small lobe, Arrokoth’s neck, the most structurally sensitive area to failure, might have been subject to substantial structural modification if the Sky-crater-forming event occurred after the bilobate shape had formed. Using the π-scaling law, we quantified the linear momentum imparted to the small lobe by the Sky-crater-forming event, which was in the range of (2.4–4.0) × 1013 kg m s−1, depending on Arrokoth’s bulk density of 250–500 kg m−3 and impact speeds of 100 m s−1, 300 m s−1, and 1 km s−1. If the linear momentum was fully transferred to Arrokoth’s small lobe, it would have given the small lobe an impulse velocity of approximately 0.1 m s−1 relative to the large lobe. To assess the structural impact of this event, we used a finite-element modeling approach to simulate post-impact stress fields driven by the estimated impulse velocity on the small lobe and constrained the critical cohesive strength required to prevent structural failure. Based on the current parameter space, our results suggest that the Sky-crater-forming event could have required the critical cohesive strength of up to ∼20 kPa for Arrokoth’s neck to avoid structural failure, which is higher than the typical cohesive strength estimated for small bodies (usually less than 1 kPa for asteroids and comets).

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Subsurface pulse, crater and ejecta asymmetry from oblique impacts into granular media

Cited by 3 publications

References 48 publications

The effect of projectile nose shape on the formation and expansion of impact-induced ejecta for sand target

The effect of projectile nose shape on the formation and expansion of impact-induced ejecta for sand target

NcorpiON : A O(N) software for N-body integration in collisional and fragmenting systems

Numerical Investigation of the Cohesive Strength Regime of the Bilobated Arrokoth after the Sky-crater-forming Impact Event

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