 In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue (UAPC) and other sources gave a sidereal period hours, as well as two spin axes at (12.0°, 67.0°) and (188.0°, 69.0°) in ecliptic coordinates (λ, β).According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, "Atossa" measures kilometers in diameter and its surface has an albedo of .The "Collaborative Asteroid Lightcurve Link" assumes a standard albedo for a Florian asteroid of 0.24 and calculates a diameter of 8.58 kilometers based on an absolute magnitude of 12.5.