"Named 2013 TV135, this giant 1,350-foot-wide minor planet will reach Earth on August 26, 2032. It has a Torino Scale rating of 1, which means that it 'merits careful monitoring.'
"If it hits Earth, it would unleash an energy of 2,500 megatons of TNT—'50 times greater than the biggest nuclear bomb ever detonated.' That's enough to destroy a state like New York and change the climate all around the world."
http://io9.com/astronomers-discover-a-massive-asteroid-that-could-hit-1447068835/1447145949
"If it hits Earth, it would unleash an energy of 2,500 megatons of TNT—'50 times greater than the biggest nuclear bomb ever detonated.' That's enough to destroy a state like New York and change the climate all around the world."
http://io9.com/astronomers-discover-a-massive-asteroid-that-could-hit-1447068835/1447145949