Asteroid Apophis 2004MN4 will come within 29000 km/ 18000 mi of striking the Earth on April 13th, 2029 this asteroid will come inside the orbits of most of are major satellites. This asteriod is the size of 3 football fields and if it hits a 400km gravitational keyhole as it sling shots aroung us then it will return in 2036 for impact. However if it should strik one or more geostationary satellites its not clear if this could slow it down enough to impact on that date.check out the videos on my site.Astronomy and Pictures, See the damage a impact can do.