According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Makio measures 7.0 kilometers in diameter and its surface has an albedo of 0.33, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 9.4 kilometers with an absolute magnitude of 12.5.
