O.G. Gladysheva Meteorite Chelyabinsk: features of destruction. // Natural Science 10(11):430-435. 2018. doi:10.4236/ns.2018.1011042.
The explosion of a space object occurred near the city of Chelyabinsk on February 15, 2013. The meteorite fragments reached the Earth's surface, this fact allowed us to consider this space object as a meteorite. However, this event showed a number of features not corresponding to the destruction of a meteorite. The space object began to disintegrate at an altitude of 70 km. when pressure on its front surface was ~ 6.7·103 N·m-2. The substance from the object’ surface was not blown off by the drops, as at ablation, but was dumped by the jets over a distance up to 1 km. The trace of space object visually reminded a trace of jet aircraft which contained water. But an abundance of water is plainly not enough on altitudes 30–70 km. It can be assumed that the object itself delivered water to these altitudes. The calculation of gas rise over the trace showed that the temperature in some parts of this trace was about 900 degrees. Heating of large masses of gas can be explained not only by the release of kinetic energy of the space object, but also by combustion processes of its substance. It was concluded that the meteorite could be delivered by a comet.