Earth radius
On 31 March 2004, around 15:35 UTC, the asteroid is crudely estimated to have passed within approximately 1 Earth radius () or 6,400 kilometers of the surface of the Earth (or 2.02  from Earth's center). But due to the very short observation arc, the uncertainty in the close approach distance is a large ±15000 km. By comparison, geostationary satellites orbit at 5.6 and GPS satellites orbit at 3.17 from the center of the Earth.