25638 Ahissar is a main belt asteroid with an estimated diameter of 10 km. It was discovered on January 4, 2000 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. The semi-major axis is 2.24 AU, the eccentricity is 0.188 and the inclination is 2.81 degrees.
This asteroid was observed on 3 nights during September and October, 2015. A period of 3.2731 hours was derived.