2010 AA15

 is a sub-kilometer asteroid from the inner asteroid belt, that has a similar but different orbit than main-belt comet P/2010 A2. During January 2010, it had been observed for two weeks by the Mount Lemmon Survey, but has since become a lost asteroid. the object has not been recovered.

Description
Using the best-fit short-arc orbital data, it appears as if the closest that comet came to asteroid  is around 0.0155 AU (2300000 km) on 22 November 2009.

This asteroid was discovered on 7 January 2010. Since it has only been observed over a fifteen-day arc of its 3.5 year orbit, details of the exact orbit still need further refining for easy recovery of this object in the distant future. The asteroid appears to have come to perihelion (closest approach to the Sun) on around 10 January 2010, only a couple days after its discovery.

Based on an absolute magnitude of 19.2, and an assumed albedo of 0.24 and 0.05, is likely to measure 380 m and 840 m in diameter for a stony and carbonaceous composition, respectively.