 According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, "Erda" measures (), () and () kilometers in diameter and its surface has an albedo of (), () and (), respectively.The "Collaborative Asteroid Lightcurve Link" derives an albedo of 0.1942 and a diameter of 36.26 kilometers based on an absolute magnitude of 9.6.An alternative mean-diameter measurement published by the WISE team gives () with an albedo of ().