 According to the survey carried out by the Infrared Astronomical Satellite IRAS, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), and the Japanese Akari satellite, "Ratisbona" measures (), () and () kilometers in diameter and its surface has a very low albedo of (), () and (), respectively.The "Collaborative Asteroid Lightcurve Link" adopts the results from IRAS, that is, a albedo of 0.0591 and a diameter of 67.57 km based on an absolute magnitude of 9.54.Further published mean-diameters and albedos by the WISE team include () and () and albedos of () and ().