432 citations · 2.3k across the 46 of their papers we have counts for
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The Dynamical State of the Didymos System Before and After the DART Impact
Derek C. Richardson, Harrison F. Agrusa, Brent Barbee +50
NASA's Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the natural satellite of (65803) Didymos, on 2022 September 26, as a first successful test of kinetic…
Surface dynamics and geophysical environment of asteroid (3200) Phaethon
Hangbin Jo, Masateru Ishiguro, Derek C. Richardson +3
Context. (3200) Phaethon is a ~5-km-diameter near-Earth asteroid with a small perihelion distance of 0.14 au and is the parent body of the Geminids. JAXA's DESTINY+ mission will fl…
The Properties and Origins of Kuiper Belt Object Arrokoth's Large Mounds
S. A. Stern, O. L. White, Wm. Grundy +10
We report on a study of the mounds that dominate the appearance of Kuiper Belt Object (KBO) (486958) Arrokoth's larger lobe, named Wenu. We compare the geological context of these…
The Perturbed Full Two-Body Problem: Application to Post-DART Didymos
Alex J. Meyer, Harrison F. Agrusa, Derek C. Richardson +19
With the successful impact of the NASA DART spacecraft in the Didymos-Dimorphos binary asteroid system, we provide an initial analysis of the post-impact perturbed binary asteroid…
Tidal resurfacing model for (99942) Apophis during the 2029 close approach with Earth
Y. Kim, J. V. DeMartini, D. C. Richardson +1
We numerically investigate tidally induced surface refreshing on Apophis during its close approach with Earth within a perigee distance of 5.96 Earth radii on April 13, 2029. We im…
Rotation-induced granular motion on the secondary component of binary asteroids: Application to the DART impact on Dimorphos
Harrison Agrusa, Ronald Ballouz, Alex J. Meyer +6
NASA's Double Asteroid Redirection Test (DART) mission will kinetically impact Dimorphos, the secondary component of the Didymos binary asteroid system, which will excite Dimorphos…
Predictions for the Dynamical States of the Didymos System before and after the Planned DART Impact
Derek C. Richardson, Harrison F. Agrusa, Brent Barbee +33
NASA's Double Asteroid Redirection Test (DART) spacecraft is planned to impact the natural satellite of (65803) Didymos, Dimorphos, around 23:14 UTC on 26 September 2022, causing a…
Dynamical Evolution of the Didymos-Dimorphos Binary Asteroid as Rubble Piles following the DART Impact
Harrison F. Agrusa, Fabio Ferrari, Yun Zhang +2
Previous efforts have modeled the Didymos system as two irregularly shaped rigid bodies, although it is likely that one or both components are in fact rubble piles. Here, we relax…
Surface Properties of Near-Sun Asteroids
Carrie E. Holt, Matthew M. Knight, Michael S. P. Kelley +8
Near-Earth Asteroids (NEAs) with small perihelion distances reach sub-solar temperatures of > 1000 K. They are hypothesized to undergo "super-catastrophic" disruption, potentially…
SPH simulations of high-speed collisions between asteroids and comets
J. Rozehnal, M. Brož, D. Nesvorný +4
We studied impact processes by means of smoothed-particle hydrodynamics (SPH) simulations. The method was applied to modeling formation of main-belt families during the cometary bo…
The Excited Spin State of Dimorphos Resulting from the DART Impact
Harrison F. Agrusa, Ioannis Gkolias, Kleomenis Tsiganis +12
The NASA Double Asteroid Redirection Test (DART) mission is a planetary defense-driven test of a kinetic impactor on Dimorphos, the satellite of the binary asteroid 65803 Didymos.…
Binary Planetesimal Formation from Gravitationally Collapsing Pebble Clouds
David Nesvorny, Rixin Li, Jacob B. Simon +4
Planetesimals are compact astrophysical objects roughly 1-1000 km in size, massive enough to be held together by gravity. They can grow by accreting material to become full-size pl…
The surface sensitivity of rubble-pile asteroids during a distant planetary encounter: Influence of asteroid shape elongation
Yaeji Kim, Masatoshi Hirabayashi, Richard P Binzel +3
We numerically investigate how an asteroid's elongation controls the sensitivity of its surface to tidal effects during a distant planetary encounter beyond the Roche limit. We ana…
Critical spin periods of sub-km-sized cohesive rubble-pile asteroids: dependencies on material parameters
Shoucun Hu, Derek C. Richardson, Yun Zhang +1
In this work, we employ a soft-sphere discrete element method with a cohesion implementation to model the dynamical process of sub-km-sized cohesive rubble piles under continuous s…
Constraining the final merger of contact binary(486958) Arrokoth with soft-sphere discrete element simulations
J. C. Marohnic, D. C. Richardson, W. B. McKinnon +8
The New Horizons mission has returned stunning images of the bilobate Kuiper belt object (486958) Arrokoth. It is a contact binary, formed from two intact and relatively undisturbe…
Superparticle Method for Simulating Collisions
David Nesvorny, Andrew N. Youdin, Raphael Marschall +1
For problems in astrophysics, planetary science and beyond, numerical simulations are often limited to simulating fewer particles than in the real system. To model collisions, the…
Initial results from the New Horizons exploration of 2014 MU69, a small Kuiper Belt Object
S. A. Stern, H. A. Weaver, J. R. Spencer +202
The Kuiper Belt is a distant region of the Solar System. On 1 January 2019, the New Horizons spacecraft flew close to (486958) 2014 MU69, a Cold Classical Kuiper Belt Object, a cla…
The solar nebula origin of (486958) Arrokoth, a primordial contact binary in the Kuiper belt
W. B. McKinnon, D. C. Richardson, J. C. Marohnic +26
The New Horizons spacecraft's encounter with the cold classical Kuiper belt object (486958) Arrokoth (formerly 2014 MU69) revealed a contact-binary planetesimal. We investigate how…
Small Solar System Bodies as granular media
D. Hestroffer, P. Sánchez, L. Staron +12
Asteroids and other Small Solar System Bodies (SSSBs) are of high general and scientific interest in many aspects. The origin, formation, and evolution of our Solar System (and oth…
Fragment properties from large-scale asteroid collisions: I: Results from SPH/N-body simulations using porous parent bodies and improved material models
Martin Jutzi, Patrick Michel, Derek C. Richardson
Understanding the collisional fragmentation and subsequent reaccumulation of fragments is crucial for studies of the formation and evolution of the small-body populations. Using an…
The formation mechanism of 4179 Toutatis' elongated bi-lobed structure in a close Earth encounter scenario
Shoucun Hu, Jianghui Ji, Derek C. Richardson +2
The optical images of near-Earth asteroid 4179 Toutatis acquired by Chang'e-2 spacecraft show that Toutatis has an elongated contact binary configuration, with the contact point lo…
Constraints on the perturbed mutual motion in Didymos due to impact-induced deformation of its primary after the DART impact
Masatoshi Hirabayashi, Stephen R. Schwartz, Yang Yu +10
Binary near-Earth asteroid (65803) Didymos is the target of the proposed NASA Double Asteroid Redirection Test (DART), part of the Asteroid Impact & Deflection Assessment (AIDA) mi…
Structural analysis of rubble-pile asteroids applied to collisional evolution
Yang Yu, Derek C. Richardson, Patrick Michel
Solar system small bodies come in a wide variety of shapes and sizes, which are achieved following very individual evolutional paths through billions of years. This paper focuses o…
Creep stability of the proposed AIDA mission target 65803 Didymos: I. Discrete cohesionless granular physics model
Yun Zhang, Derek C. Richardson, Olivier S. Barnouin +7
As the target of the proposed Asteroid Impact & Deflection Assessment (AIDA) mission, the near-Earth binary asteroid 65803 Didymos represents a special class of binary asteroids, t…