Episodes of particle ejection from the surface of the active asteroid (101955) Bennu

@article{Lauretta2019EpisodesOP,
  title={Episodes of particle ejection from the surface of the active asteroid (101955) Bennu},
  author={D. Lauretta and C. Hergenrother and S. Chesley and J. Leonard and J. Pelgrift and C. Adam and M. A. Al Asad and P. Antreasian and R. Ballouz and K. Becker and C. Bennett and B. Bos and W. Bottke and M. Brozovic and H. Campins and H. Connolly and M. Daly and A. Davis and J. de Le{\'o}n and D. DellaGiustina and C. D. Drouet d’Aubigny and J. Dworkin and J. Emery and D. Farnocchia and D. Glavin and D. Golish and C. Hartzell and R. Jacobson and E. Jawin and P. Jenniskens and J. Kidd and E. Lessac-Chenen and J.-Y. Li and G. Libourel and J. Licandro and A. Liounis and C. Maleszewski and C. Manzoni and B. May and L. Mccarthy and J. McMahon and P. Michel and J. Molaro and M. Moreau and D. Nelson and W. Owen and B. Rizk and H. Roper and B. Rozitis and E. Sahr and D. Scheeres and J. Seabrook and S. Selznick and Y. Takahashi and F. Thuillet and P. Tricarico and D. Vokrouhlicky and C. Wolner},
  journal={Science},
  year={2019},
  volume={366}
}
Bennu ejects material from its surface Most asteroids appear inert, but remote observations show that a small number experience mass loss from their surfaces. Lauretta and Hergenrother et al. describe close-range observations of mass loss on the near-Earth asteroid Bennu (see the Perspective by Agarwal). Shortly after arriving at Bennu, navigation cameras on the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security—Regolith Explorer) spacecraft detected objects 1… Expand
Introduction to the Special Issue: Exploration of the Activity of Asteroid (101955) Bennu
TLDR
Of the potential mechanisms behind this activity that were investigated in focused studies, meteoroid impacts, thermal fracturing, and ricochet—but not water ice sublimation—were found to be consistent with observations, suggesting that many near‐Earth asteroids may exhibit activity that has gone unnoticed thus far. Expand
Meteoroid Impacts as a Source of Bennu's Particle Ejection Events
TLDR
It is found that 7,000‐J impacts on Bennu occur with a biweekly cadence near perihelion, with a preference to strike in the late afternoon (~6 pm local time), which matches observations. Expand
Close-up view of an active asteroid
TLDR
Centimeter-sized debris was found ejected from the surface of the likely ice-free asteroid 101955 Bennu in images taken by NASA's OSIRIS-REx spacecraft, showing that asteroids are far from being inert bodies. Expand
Dynamical Evolution of Simulated Particles Ejected From Asteroid Bennu
In early 2019, the OSIRIS‐REx spacecraft discovered small particles being ejected from the surface of the near‐Earth asteroid Bennu. Although they were seen to be ejected at slow speeds, on the orderExpand
Reconstruction of Bennu Particle Events From Sparse Data
TLDR
This newly developed technique offers the capacity to meaningfully constrain the properties of particle ejection events from limited data and comparison with higher‐fidelity orbit determination solutions for the events with sufficient observations demonstrates the validity of this approach. Expand
Widespread carbon-bearing materials on near-Earth asteroid (101955) Bennu
TLDR
The OSIRIS-REx results constrain Bennu's evolution and provide context for the sample collected in October 2020, as well as finding evidence for organic and carbonate materials that are widely distributed across the surface but are most concentrated on individual boulders. Expand
Variations in color and reflectance on the surface of asteroid (101955) Bennu
TLDR
Maps of color and albedo on asteroid Bennu indicate complex evolution of its surface due to space weathering, and constrain Bennu's evolution and provide context for the sample collected in October 2020. Expand
Bright carbonate veins on asteroid (101955) Bennu: Implications for aqueous alteration history
TLDR
Global spectral observations by the OSIRIS-REx spacecraft have shown that carbon-bearing materials, including organics and/or carbonates, are widespread on the surface of near-Earth asteroid (101955) Bennu. Expand
Global Patterns of Recent Mass Movement on Asteroid (101955) Bennu
The exploration of near‐Earth asteroids has revealed dynamic surfaces characterized by mobile, unconsolidated material that responds to local geophysical gradients, resulting in distinct morphologiesExpand
Initial Orbit Determination and Event Reconstruction From Estimation of Particle Trajectories About (101955) Bennu
TLDR
Current results pertaining to the identification of particle tracks, an evaluation of the estimated orbits and the excess velocity necessary to induce the particle ejection from the surface, and the uncertainty quantification of the ejection location are presented. Expand
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