On 8 October, the rock crashed into the atmosphere above South Sulawesi, Indonesia. The blast was heard by monitoring stations 10,000 miles away, according to a report by scientists at the University of Western Ontario.
Scientists are concerned that it was not spotted by any
and that had it been larger it could have caused a disaster.
The asteroid, estimated to have been around 10 metres (30ft) across, hit the atmosphere at an estimated 45,000 mph. The sudden deceleration caused it to heat up rapidly and explode with the force of 50,000 tons of TNT.
Luckily, due to the height of the explosion – estimated at between 15 and 20 km (nine to 12 miles) above sea level – no damage was caused on the ground.
However, if the object had been slightly larger – 20 to 30
(60 to 30 ft) across – it could easily have caused extensive damage and
loss of life, say researchers.
The fireball was spotted by locals in Indonesia, and a YouTube video taken that day "appears to show a large dust cloud consistent with a bright, daylight fireball", according to the Ontario researchers.Source: http://www.telegraph.co.uk/science/space/6444895/Asteroid-explosion-over-Indonesia-raises-fears-about-Earths-defences.html