They did detect it a few days after it reached it closest point. The original data about the discovery is here:
http://www.minorplanetcenter.net/mpec/K02/K02M14.html
They did detect it a few days after it reached it closest point. The original data about the discovery is here:
http://www.minorplanetcenter.net/mpec/K02/K02M14.html
RE: Fact of the day #7: June 14 2002: Asteroid’s near-miss with Earth