On February 15, 2013, an asteroid entered Earth's atmosphere over Russia. With an estimated speed 18 km per second the meteor became a supetolide over the southern Ural region. It exploded in an air burst over Chelyabinsk Oblast creating small fragmentary meteorites and a shock wave. The Interplanetary Matter Department of the Astronomical Institute of the ASCR published a study that calculated the meteor's trajectory in the Solar System and in the Earth's atmosphere. and Pavel Spurný, Jiří Borovička a Petr Pravec.