Fireball, 17 April 2011
On 17 April 2011 at 11:21 UTC, sensors detected a fireball. It released energy equal to about 0.24 kilotons of TNT.
The numbers
- Date and time (UTC)
- 17 April 2011, 11:21
- Location
- Not released
- Height at peak brightness
- Not released
- Speed
- Not released
- Light energy radiated
- 7.81 × 10¹⁰ joules
- Estimated total energy
- 0.24 kilotons of TNT
What does that mean?
That is a small burst by fireball standards: the Chelyabinsk fireball of 2013 released about 440 kilotons. If the object was stony rock entering at a typical 20 km/s, it was roughly 1.5 metres across and weighed around 5 tonnes.
Most objects of this kind break up and burn away high in the atmosphere, but larger ones can drop small meteorites. About 70% of Earth is ocean, so most fireballs like this fall into the sea.
Saw a bright fireball yourself? Report what you saw.