Rosenthal is a non-family asteroid from the main belt's background population. It orbits the Sun in the inner asteroid belt at a distance of 2.0-2.9 AU once every 3 years and 10 months (1,392 days; semi-major axis of 2.44 AU). Its orbit has an eccentricity of 0.17 and an inclination of 12° with respect to the ecliptic. The body's observation arc begins with a precovery published by the Digitized Sky Survey. It was taken at the Siding Spring Observatory in September 1990, more than 4 years prior to its official discovery observation at Tautenburg.