February 15, 2018 marks the 5th anniversary of the Chelyabinsk event, the biggest asteroid airburst this century so far and the biggest one since the 1908 Tunguska event. This is also the only asteroid confirmed to have resulted in a large number of injuries.
The asteroid exploded some 29.7 km (18.5 miles) above the Russian city of Chelyabinsk at 09:20 YEKT (03:20 UTC) on February 15, 2013, damaging over 3 000 buildings and injuring over 1 500 people (mostly by broken window glass). had an estimated size of approximately 20 m (65 feet).
Although it was just about 20 m (65 feet), its light was brighter than the Sun and visible up to 100 km (62 miles) away.
Chelyabinsk asteroid, officially named Chelyabinsk meteorite, was undetected before its atmospheric entry, in part because its radiant was close to the Sun.
In the hours following the visual meteor sighting, a 6-meter (20 feet) wide hole was discovered on Lake Chebarkul’s frozen surface and scientists from the Ural Federal University collected 53 samples from around the hole the same day it was discovered.
A large number of small meteorites fell on areas west of Chelyabinsk and local residents and schoolchildren located and picked up some of them by following a visible hole that had been left in the outer surface of the snow.