 In April 2017, Spanish astronomers at Puçol Observatory () and other stations of the APTOG-network measured a similar period of 2.6700 hours and an amplitude of 0.10 magnitude ().According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Cydonia" measures between 12.140 and 12.95 kilometers in diameter and its surface has an albedo between 0.1719 and 0.241.The "Collaborative Asteroid Lightcurve Link" assumes an albedo of 0.21 – derived from 15 Eunomia, the family's parent body and namesake – and calculates a diameter of 13.26 kilometers based on an absolute magnitude of 11.7.