 While not being a slow rotator, which have periods longer than 100 hours, "Geldonia"s spin rate is still longer than that of most minor planets, which typically rotate between 2 and 20 hours once around their axis.According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Geldonia" measures between 30.395 and 36.08 kilometers in diameter and its surface has an albedo between 0.098 and 0.1182.The "Collaborative Asteroid Lightcurve Link" adopts the results obtained by Infrared Astronomical Satellite, that is, an albedo of 0.1299 and a diameter of 31.25 kilometers based on an absolute magnitude of 10.36.