233 Asterope is a large main-belt asteroid that was discovered on 11 May 1883, by French astronomer Alphonse Borrelly at Marseille Observatory in Marseille, France.

This asteroid is orbiting the Sun with a semimajor axis of 2.66 AU, a period of 4.34 years, and an eccentricity of 0.10.

[4] Photometric observations during 1995 show a rotation period of 19.743 hours.

[3] Measurements made with the IRAS observatory give a diameter of 109.56 ± 5.04 km and a geometric albedo of 0.08 ± 0.01.

By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 97.54 ± 10.32 km and a geometric albedo of 0.10 ± 0.01.