Asteroid 2012-DA14 will pass very close to Earth on Feb. 15, 2013 (NASA)
A rock approximately 165 feet wide is going to fly by the Earth on the 15th of Feb, 2013. The Asteroid is traveling at a speed of 17,800 mph and set to come as close as 17,200 miles of our planet. This is closer that some of our satellites. NASA uses a very technical phrase when they refer to an event like this, they call is "a close call".
NASA scientists say that there should not be a problem and that we should not expect an impact. So, providing this rock stays it's course and doesn't change, we should be ok.