432 citations · 1.3k across the 23 of their papers we have counts for
23 papers
Physical Analysis of Bennu Samples Reveals Regolith Production by Collisional Disruption on Near-Earth Asteroids
R. -L. Ballouz, A. J. Ryan, R. J. Macke +25
Owing to the extremely low gravity of small near-Earth asteroids (NEAs), it has been assumed that impact-generated rock fragments escape into space and thus do not contribute to th…
Dynamics of planetary rings under thermal forces
Wen-Han Zhou, Eiichiro Kokubo, Harrison Agrusa +5
Planetary rings provide natural laboratories for studying the fundamental processes that govern the evolution of planetary systems. However, several key features, such as the sharp…
Satellite formation around the largest asteroids
Kevin J. Walsh, Ronald-Louis Ballouz, Harrison F. Agrusa +3
Satellites around large asteroids are preferentially found among those with the most rapid rotation and elongated shape. The taxonomic statistics are similarly skewed; in total, 13…
A Mission to Demonstrate Rapid-Response Flyby Reconnaissance for Planetary Defense
Nancy L. Chabot, Justin A. Atchison, Rylie Bull +13
International and U.S. strategies and protocols have identified the need to develop rapid-response spacecraft reconnaissance capabilities as a priority to advance planetary defense…
Shaking and Tumbling: Short- and Long-Timescale Mechanisms for Resurfacing of Near-Earth Asteroid Surfaces from Planetary Tides and Predictions for the 2029 Earth Encounter by (99942) Apophis
R. -L. Ballouz, H. Agrusa, O. S. Barnouin +14
Spectral characterization of near-Earth asteroids (NEAs) has revealed a continuum of space-weathered states for the surfaces of S-complex NEAs, with Q-class NEAs, an S-complex subc…
Asteroid (101955) Bennu in the Laboratory: Properties of the Sample Collected by OSIRIS-REx
Dante S. Lauretta, Harold C. Connolly, Joseph E. Aebersold +50
On 24 September 2023, the NASA OSIRIS-REx mission dropped a capsule to Earth containing approximately 120 g of pristine carbonaceous regolith from Bennu. We describe the delivery a…
Direct -body simulations of satellite formation around small asteroids: insights from DART's encounter with the Didymos system
Harrison F. Agrusa, Yun Zhang, Derek C. Richardson +18
We explore binary asteroid formation by spin-up and rotational disruption considering the NASA DART mission's encounter with the Didymos-Dimorphos binary, which was the first small…
Successful Kinetic Impact into an Asteroid for Planetary Defense
R. Terik Daly, Carolyn M. Ernst, Olivier S. Barnouin +98
While no known asteroid poses a threat to Earth for at least the next century, the catalog of near-Earth asteroids is incomplete for objects whose impacts would produce regional de…
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…
Spin-driven evolution of asteroids' top-shapes at fast and slow spins seen from (101955) Bennu and (162173) Ryugu
Masatoshi Hirabayashi, Ryota Nakano, Eri Tatsumi +14
Proximity observations by OSIRIS-REx and Hayabusa2 provided clues on the shape evolution processes of the target asteroids, (101955) Bennu and (162173) Ryugu. Their oblate shapes w…
The Sands of Phobos: The Martian moon's eccentric orbit refreshes its surface
Ronald-Louis Ballouz, Nicola Baresi, Sarah T. Crites +2
The surface of the Martian moon Phobos exhibits two distinct geologic units, known as the red and blue units. The provenance of these regions is uncertain yet crucial to understand…
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…
Numerical Simulations of Saturn's B Ring: Granular Friction as a Mediator between Self-Gravity and Viscous Overstability
Ronald-Louis Ballouz, Derek C. Richardson, Ryuji Morishima
We study the B ring's complex optical depth structure. The source of this structure may be the complex dynamics of the Keplerian shear and the self-gravity of the ring particles. T…
The spherical Brazil Nut Effect and its significance to asteroids
Viranga Perera, Alan P. Jackson, Erik Asphaug +1
Many asteroids are likely rubble-piles that are a collection of smaller objects held together by gravity and possibly cohesion. These asteroids are seismically shaken by impacts, w…
Numerical Simulations of Collisional Disruption of Rotating Gravitational Aggregates: Dependence on Material Properties
Ronald-Louis Ballouz, Derek C Richardson, Patrick Michel +2
Our knowledge of the strengths of small bodies in the Solar System is limited by our poor understanding of their internal structures, and this, in turn, clouds our understanding of…
Numerical predictions of surface effects during the 2029 close approach of asteroid 99942 Apophis
Yang Yu, Derek C. Richardson, Patrick Michel +2
Asteroid (99942) Apophis' close approach in 2029 will be one of the most significant small-body encounter events in the near future and offers a good opportunity for in situ explor…
The Brazil-nut effect and its application to asteroids
Soko Matsumura, Derek C. Richardson, Patrick Michel +2
Out of the handful of asteroids that have been imaged, some have distributions of blocks that are not easily explained. In this paper, we investigate the possibility that seismic s…
Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
Ronald-Louis Ballouz, Derek C. Richardson, Patrick Michel +1
We carry out a systematic exploration of the effect of pre-impact rotation on the outcomes of low-speed collisions between planetesimals modeled as gravitational aggregates. We use…
The Hot Components of AM CVn Helium Cataclysmics
Edward M. Sion, Albert P. Linnell, Patrick Godon +1
We present the results of a multi-component synthetic spectral analysis of the archival far ultraviolet spectra of the hot components of several AM CVn double degenerate interactin…
Far Ultraviolet Spectroscopy of Seven Nova-Like Variables
Trisha Mizusawa, Jason Merritt, Ronald-Louis Ballouz +6
We present the results of a multi-component synthetic spectral analysis of the archival far ultraviolet spectra of several key nova-like variables including members of the SW Sex,…
On The Accretion Rates of SW Sextantis Nova-Like Variables
Ronald-Louis Ballouz, Edward M. Sion
We present accretion rates for selected samples of nova-like variables having IUE archival spectra and distances uniformly determined using an infrared method by Knigge (2006). A c…
Hubble Space Telescope STIS Spectroscopy of Three Peculiar Nova-Like Variables: BK Lyn, V751 Cygni and V380 Oph
Robert Zellem, Nicholas Hollon, Ronald-Louis Ballouz +4
We obtained Hubble STIS spectra of three nova-like variables: V751 Cygni, V380 Oph, and - the only confirmed nova-like variable known to be below the period gap - BK Lyn. In all th…