author={Carlos de la Fuente Marcos and Ra{\'u}l de la Fuente Marcos and Sverre J. Aarseth},
  journal={The Astrophysical Journal},
On 2013 February 15 a small asteroid rammed against the atmosphere above the region of Chelyabinsk in Russia, producing the most powerful superbolide since the Tunguska event in 1908. Lacking proper astrometric observations, the pre-impact orbit of this object has been determined using videos, satellite images, and pure geometry. Unfortunately, more than two years after the event, the published estimates vary so much that there is no clear orbital solution that could be used to investigate the… 
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