 In April 2010, a rotational lightcurve of "Geranium" was obtained from photometric observations by astronomers at the Oakley Southern Sky Observatory in Australia.Lightcurve analysis gave a well-defined rotation period of 12.363 hours with a brightness amplitude of 0.08 magnitude, indicative for a rather spherical shape ().According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Geranium" measures between 46.08 and 51.025 kilometers in diameter and its surface has an albedo between 0.0619 and 0.076.