 In 2017, a modeled lightcurve gave a concurring sidereal period of hours as well as a spin axis of (223.0°, −41.0°) in ecliptic coordinates (λ, β).According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), "Ara" measures (), () and () kilometers in diameter and its surface has an albedo of (), () and (), respectively.Alternative mean-diameters published by the WISE team include () and () with corresponding albedos of () and ().