2525 O'Steen is a main belt asteroid with an estimated diameter of about 10 km. It was discovered on November 2, 1981 by B. A. Skiff at Flagstaff. The semi-major axis is 3.13 AU, the eccentricity is 0.186 and the inclination is 2.77 degrees.
Observations of this asteroid were made on seven nights between October and December 2003. The data for O’Steen was noisy and difficult to reduce. The best period I could derive was 5.538 hours; however the second peak is difficult to discern. There was a suggestion on two nights of a second dip in this region. Whether this is real or just noise I am uncertain. More work is required on this asteroid.