The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 9.40 kilometers based on an absolute magnitude of 12.50.
The Collaborative Asteroid Lightcurve Link uses a standard albedo of 0.20 for stony asteroids to determine that the asteroid's diameter is 9.40 kilometers, given its absolute magnitude of 12.50.