 Lightcurve analysis gave a well-defined rotation period of 5.1547 hours with a brightness amplitude of 0.27 magnitude ().According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, "Syringa" measures between 19.711 and 24.30 kilometers in diameter and its surface has a low albedo between 0.031 and 0.045.The "Collaborative Asteroid Lightcurve Link" derives an albedo of 0.0434 and a diameter of 22.13 kilometers based on an absolute magnitude of 12.3.