 Lightcurve analysis gave a rotation period of hours with a low brightness variation of magnitude, indicative of a non-elongated, spherical shape ().Other period determinations were made by Marciniak as well as by Raphaël Nicollerat and Raoul Behrend, giving a low-amplitude lightcurve with a period of and hours, respectively ().According to the survey carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), "Rhoda" measures (), () and () kilometers in diameter and its surface has an albedo of (), () and (), respectively.