NEODyS

See the paper entitled CLOSE EARTH APPROACHES OF ASTEROID 1999 AN10: RESONANT AND NON-RESONANT RETURNS, by A. Milani, S. R. Chesley and G.B. Valsecchi, Astron. Astrophys. 346, L65-L68, 1999. (HTML version with figures) (postscript gzipped, 94K)
An official statement by the International Astronomical Union on the paper above was posted on the IAU NEO home page.
The JPL NEO web site also has some interesting information on this object's impact possibilities.
Precovery observations from 1955 have eliminated any possibility of collision for the next several decades. See MPEC 1999 N-21 for details.

NEODyS-2