Based on a generic magnitude-to-diameter conversion, its diameter is between 7 and 17 kilometers for an absolute magnitude of 12.8 and an albedo in the range of 0.05 to 0.25.
Assuming a standard relationship between size and diameter, this celestial object's diameter falls within the range of 7 to 17 kilometers when considering its absolute magnitude of 12.8 and an albedo between 0.05 and 0.25.