120577

120577 is a minor planet in the outer region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 17 October 1997, by astronomers of the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico. The Minor Planet Center designated the asteroid with the provisional designation 1997 UX29. It was later numbered as 120577.

The asteroid orbits the Sun at a distance of 2.7–3.4 AU once every 5 years and 3 months (1913 days). Its orbit has an eccentricity of 0.12 and an inclination of 14° with respect to the ecliptic. The first precovery was taken at Palomar Observatory in 1954, extending the asteroid's observation arc by 43 years prior to its official discovery observation at Socorro.

Photometric observations of 120577 during 2010 and 2011 were used to build a light curve plot. It gave a rotation period of 12.36 hours with a brightness variation of 0.15 magnitude. The asteroid has an absolute magnitude of 13.9, which corresponds to a diameter of about 10 kilometers, assuming an albedo of 0.20.