On Feb 15th, an asteroid about "half the size of a football field" will pass within geosynchronous orbit.
Record Setting Asteroid Flyby
http://science.nasa.gov/science-news/science-at-nasa/2013/28jan_2012da/
Below link is to a diagram of its path. And just to clarify, what I meant by "within geosynchronous orbit", is that it will pass within the "geosynchronous ring" of where many satellites orbit.
http://neo.jpl.nasa.gov/images/2012da14.jpg