A 500-kiloton airburst over Chelyabinsk and an enhanced hazard from small impactors

@article{Brown2013A5A,
  title={A 500-kiloton airburst over Chelyabinsk and an enhanced hazard from small impactors},
  author={Peter Brown and Jelle D. Assink and Luciana Astiz and Rhiannon Blaauw and Mark Bruce Elrick Boslough and Jiř{\'i} Borovička and Nicolas Brachet and D. Brown and Margaret Campbell-Brown and Lars Ceranna and William J. Cooke and Catherine D. Groot‐Hedlin and Douglas P. Drob and Wayne N. Edwards and L{\"a}slo Gerardus Evers and Milton Garc{\'e}s and Jacquelyn L. Gill and Michael A. H. Hedlin and Aaron Kingery and Gabi Laske and Alexis Le Pichon and Pierrick Mialle and Danielle E. Moser and Alexander Saffer and Elizabeth A. Silber and P. S. M. Smets and Richard Spalding and Pavel Spurn{\'y} and Edward Tagliaferri and David Uren and Robert J. Weryk and Rodney W. Whitaker and Zbigniew Krzeminski},
  journal={Nature},
  year={2013},
  volume={503},
  pages={238-241}
}
Most large (over a kilometre in diameter) near-Earth asteroids are now known, but recognition that airbursts (or fireballs resulting from nuclear-weapon-sized detonations of meteoroids in the atmosphere) have the potential to do greater damage than previously thought has shifted an increasing portion of the residual impact risk (the risk of impact from an unknown object) to smaller objects. Above the threshold size of impactor at which the atmosphere absorbs sufficient energy to prevent a… 
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TLDR
An analysis of selected video records of the Chelyabinsk superbolide of 15 February 2013 found that its orbit was similar to the orbit of the two-kilometre-diameter asteroid 86039, to a degree of statistical significance sufficient to suggest that the two were once part of the same object.
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