Asteroid 9928 1981 WE9 is a main belt asteroid with an estimated diameter of 10 km. It was discovered on November 16, 1981 by observers at the Perth Observatory in Bickley, Western Australia. It is a member of the the Flora family of asteroids. The semi-major axis is 2.22 AU, the eccentricity is 0.177 and the inclination is 2.84 degrees.
Observations of this asteroid were made on five nights, during June, 2007. The resulting lightcurve showed a period of 5.547 hours.