Close encounter with an asteroid.....

Earth will have a record setting asteroid flyby this Friday February 15, 2013.  The asteroid, which was discovered last year and named 2012DA14, is half the size of a football field and will pass within 17,200 miles of Earth.  This is closer than the moon and within the path of navigation and communication satellites.  "This is a record-setting close approach,"  Don Yeomans, the head of NASA's asteroid-tracking program, said in a statement. "Since regular sky surveys began in the 1990s, we've never seen an object this big get so close to Earth."  Yeomans  stressed that, while the asteroid's approach will bring it closer than the geosynchronous satellites  orbiting 22,245 miles (35,800 km) above Earth, 2012 DA14 poses no threat of a deadly collision with the planet.
"2012 DA14 will definitely not hit Earth. The orbit of the asteroid is known well enough to rule out an impact," Yeomans, heads the Near-Earth Object Program at NASA's Jet Propulsion Laboratory in Pasadena, Calif. He added that the odds it will slam into a satellite are "extremely remote."
It will not be visible to the naked eye.  You can see it if you have good binoculars or a telescope and know where to look.  It will be moving fast.  

For more information on asteroids, check out this article:
http://www.space.com/51-asteroids-formation-discovery-and-exploration.html

One more article also about what would happen:
So if Friday’s flyby asteroid DID hit Earth...