 They gave three concurring lightcurves with a rotation period of 2.709 hours and a brightness variation of 0.08 to 0.10 magnitude, indicating a nearly spheroidal shape for the asteroid's body ().The photometric observations also revealed, that "Belgica" is a binary system with an asteroid moon, approximately 36% the diameter of its primary, orbiting it every hours.Johnston's archive derives a diameter of 3.53 kilometers and estimates a semi-major axis of 34 kilometer for the moon.