The primary source of finding information tracking
asteroids near earth are found on NASA's website for
their Near-Earth
Object Program, complete with risk assessments.
Asteroid
2010 GA6 To Fly Within Moon's Orbit on April 8, 2010
April 6, 2010
NASA, universities, and astronomers around the world search the skies for near earth objects and those are reported on that website.
Here is the latest story on near-earth asteroids:
Asteroid
2010 GA6 To Fly Within Moon's Orbit on April 8, 2010 April 6, 2010
A newly discovered asteroid, 2010 GA6, will safely fly by Earth this Thursday at 4:06 p.m. Pacific (23:06 U.T.C.). At time of closest approach 2010 GA6 will be about 359,000 kilometers (223,000 miles) away from Earth - about 9/10ths the distance to the moon. The asteroid, approximately 22 meters (71 feet) wide, was discovered by the Catalina Sky Survey, Tucson, Az.