 According to the surveys 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), "Itha" measures (), () and () kilometers in diameter, and its surface has an albedo of (), () and (), respectively.The "Collaborative Asteroid Lightcurve Link" derives an albedo of 0.2412 and a diameter of 20.53 km based on an absolute magnitude of 10.6.Other published mean-diameters by the WISE team include () and () with corresponding albedos of () and ().