Bennu’s near-Earth lifetime of 1.75 million years inferred from craters on its boulders

@article{Ballouz2020BennusNL,
  title={Bennu’s near-Earth lifetime of 1.75 million years inferred from craters on its boulders},
  author={R.-L. Ballouz and Kevin John Walsh and Olivier S. Barnouin and Daniella N. DellaGiustina and Manar Al Asad and Erica R. Jawin and Michael G. Daly and William F. Bottke and Patrick Michel and Chrysa Avdellidou and Marco Delbo’ and R. T. Daly and Erik Asphaug and Carina A. Bennett and Edward B. Bierhaus and Harold C. Connolly and Dathon R. Golish and Jamie L. Molaro and Michael C. Nolan and Maurizio Pajola and Bashar Rizk and Stephen R. Schwartz and David Trang and Catherine W. V. Wolner and Dante S. Lauretta},
  journal={Nature},
  year={2020},
  pages={1-5}
}
An asteroid’s history is determined in large part by its strength against collisions with other objects 1 , 2 (impact strength). Laboratory experiments on centimetre-scale meteorites 3 have been extrapolated and buttressed with numerical simulations to derive the impact strength at the asteroid scale 4 , 5 . In situ evidence of impacts on boulders on airless planetary bodies has come from Apollo lunar samples 6 and images of the asteroid (25143) Itokawa 7 . It has not yet been possible, however… Expand
16 Citations
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Abstract The near-Earth asteroid (162173) Ryugu displays a Cb-type average spectrum and a very low average normal albedo of 0.04. Although the majority of boulders on Ryugu have reflectance spectraExpand
High-resolution observations of bright boulders on asteroid Ryugu: 2. Spectral properties
Abstract Many small boulders with reflectance values higher than 1.5 times the average reflectance have been found on the near-Earth asteroid 162,173 Ryugu. Based on their visible wavelength spectralExpand
Fine-regolith production on asteroids controlled by rock porosity.
TLDR
It is interpreted to mean that accumulation of unconsolidated subcentimetre particles is frustrated where the rocks are highly porous, which appears to be most of the surface of Bennu, and that regolith blankets are uncommon on carbonaceous asteroids, which are the most numerous type of asteroid. Expand
Modified granular impact force laws for the OSIRIS-REx touchdown on the surface of asteroid (101955) Bennu
  • R. Ballouz, K J Walsh, +13 authors D. Lauretta
  • Physics
  • Monthly Notices of the Royal Astronomical Society
  • 2021
The OSIRIS-REx mission collected a sample from the surface of the asteroid (101955) Bennu in 2020 October. Here, we study the impact of the OSIRIS-REx Touch-and-Go Sampling Acquisition MechanismExpand
In search of Bennu analogs: Hapke modeling of meteorite mixtures
Context. The OSIRIS-REx Visible and InfraRed Spectrometer onboard the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer spacecraft obtained many spectra fromExpand
Diurnal temperature variation as the source of the preferential direction of fractures on asteroids: Theoretical model for the case of Bennu
Abstract It has been shown that temperature cycles on airless bodies of our Solar System can cause damaging of surface materials. Nevertheless, propagation mechanisms in the case of space objects areExpand
Tensile strength and elastic properties of fine-grained ice aggregates: Implications for crater formation on small icy bodies
Abstract The mechanical and elastic properties of ice aggregates (snow) are important in the physics of avalanches and crater formation on icy bodies, such as icy satellites and cometary nuclei. HereExpand
Particle Size-Frequency Distributions of the OSIRIS-REx Candidate Sample Sites on Asteroid (101955) Bennu
TLDR
Higher-resolution data from regional observations were used to calculate particle size-frequency distributions (PSFDs) and assess the viability of four candidate sites for sample collection and found that each site has experienced different geologic processing. Expand
Bennu regolith mobilized by TAGSAM: Expectations for the OSIRIS-REx sample collection event and application to understanding naturally ejected particles
Abstract The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission will collect material from the asteroid Bennu and return it to Earth. TheExpand
Impacts on the Moon: Analysis methods and size distribution of impactors
Abstract We are preparing a telescope system to carry out a survey of detection and analysis of lunar impact flashes. In the framework of this project, here we present all necessary methods toExpand
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Small, kilometre-sized near-Earth asteroids are expected to have young and frequently refreshed surfaces for two reasons: collisional disruptions are frequent in the main asteroid belt where theyExpand
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