Harrison Agrusa

Deimos’s shape and geology explained by a subcatastrophic impact

Sabina D. Raducan, Harrison Agrusa, E. Asphaug, C. M. Ernst et autres

Abstract Small planetary bodies record the processes that shaped the Solar System, but their surfaces and interiors often evolve in unexpected ways. Deimos, the potato-shaped, 12-km-diameter outer satellite of Mars, has a strikingly smooth surface covered by fine regolith, in contrast to …

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Catastrophic disruptions as the origin of contact-binary asteroids

Harrison Agrusa, Joseph Demartini, Thomas Meier, Patrick Michel

Contact binaries are common among small bodies throughout the Solar System. Based on radar images, ~10-30% of all NEAs larger than ~200 m are thought to be contact binaries [1,2], though their origin remains poorly explained. NASA’s Lucy mission recently encountered the …

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The Soft-Sphere Discrete Element Method in pkdgrav3 for Small-Body Simulations

Joseph DeMartini, Harrison Agrusa, Thomas Meier

Originally developed for darkmatter-only, cosmological N-body simulations, pkdgrav is a massively-parallel N -body code that uses a k-D binary tree for domain decomposition and for approximating the gravity of distant particles [1]. A treatment for collisions was added which enabled applications in …

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The Lucy flyby of (52246) Donaldjohanson: A bilobed asteroid with tumbling rotation

S. Marchi, Harold F. Levison, Keith Noll, J. R. Spencer et autres

The main belt asteroid (52246) Donaldjohanson (DJ) is a likely member of the Erigone asteroid family. This implies that DJ is a fragment of a larger parent body that was destroyed in a collision about 155 million years ago. We report observations …

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Diverse configurations of binary asteroids explained by multi-generation satellites

Wen-Yue Dai, Bin Cheng, Yukun Huang, Yifei Jiao et autres

Binary asteroid systems are ubiquitous in the Solar System. Many of them originate from rotational breakup, where an asteroid’s spin-up triggers mass shedding and subsequent satellite formation from a transient debris disk. While prolate satellites on compact orbits are expected in this …

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Are Thalassa and Despina in Resonance Lock with Neptune’s Oscillations?

Matija Ćuk, Harrison Agrusa, M. Brozović, Matthew M. Hedman

Abstract The two innermost moons of Neptune, Naiad and Thalassa, are currently in a 73:69 mean-motion resonance. This resonance relies on the large inclination of Naiad, and we estimate that Naiad requires multiple Gyr to reach its 4 . ° 7 inclination …

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Erratum: “The Yarkovsky Effect on the Long-term Evolution of Binary Asteroids” (2024, ApJL, 968, L3)

Wen-Han Zhou, David Vokrouhlický, Masanori Kanamaru, Harrison Agrusa et autres

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Diverse configurations of binary asteroids explained by multi-generation satellites

Junfeng Li, Wen-Yue Dai, Bin Cheng, Yukun Huang et autres

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Multiple moonlet mergers as the origin of the Dinkinesh-Selam system

Sabina D. Raducan, Gustavo Madeira, Harrison Agrusa, Colby C. Merrill et autres

On November 1st, 2023, the Lucy spacecraft encountered the main-belt asteroid Dinkinesh, revealing the first confirmed contact binary moon, (152830) Dinkinesh I Selam. Here, we show that Selam likely formed through a series of low-velocity collisions of similarly sized moonlets that once …

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A Change of the Rotation Period of Asteroid (65803) Didymos Caused by the DART Impact

Josef Ďurech, Petr Pravec, Masatoshi Hirabayashi, D. C. Richardson et autres

Abstract On 2022 September 26, the NASA Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the secondary component of the binary asteroid (65803) Didymos. This experiment tested the kinetic impactor technology for diverting dangerous asteroids. Due to the impact, the binary system’s …

Gravitational scattering of ejecta in the Didymos system cannot explain the evolution of the binary's orbital period

Harrison Agrusa, Camille Chatenet

Context. In the first few months following the DART impact on Dimorphos, it appears that the orbital period dropped by ∼30 s in addition to the immediate ∼30 min drop. This effect has been attributed to “binary hardening”, whereby the binary's orbital …

The Influence of Central Body Tides on Catastrophic Disruptions of Close-in Planetary Satellites

Harrison Agrusa, Patrick Michel

Abstract We model the outcomes of catastrophic disruptions on small, gravity-dominated natural satellites, accounting for the tidal potential of the central body, which is neglected in classical disruption scaling laws. We introduce the concept of Q TD ⋆ , the specific energy …

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