The low brightness amplitude is indicative that is asteroid is rather spherical than elongated in shape. Alternative period determinations were made by French amateur astronomer René Roy (5.274 h; Δ0.21 mag) in August 2004 (). Two more lightcurves were obtained by Brian Warner at this Palmer Divide Observatory in Colorado, United States, in August 2004 and August 2010, who measured a period of 4.930 and 5.28 hours with an amplitude of 0.11 and 0.14 magnitude, respectively. According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, "Cincinnati" measures between 19.4 and 19.8 kilometers in diameter and its surface has an albedo of 0.15–0.16, while the Japanese Akari satellite determined a diameter of 22.16 kilometers with an albedo of 0.12. The "Collaborative Asteroid Lightcurve Link" assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 27.9 kilometers based on an absolute magnitude of 11.5.