The layout of the impact area suggests that the body fell at a shallow angle, and was moving at typical (although slightly slow) meteorite entry speeds of 11-17 km/s. Its total mass was more than 3,500 tonnes (which would give it a diameter of 16 meters at a density of 1.5 g/cm^3). The shallow angle presented the body with more air resistance than it would have encountered at a steeper angle, and it broke up in the air into at least four pieces before impact. The biggest piece struck with an explosion roughly equivalent to the atom bomb that levelled Hiroshima.