1104 Syringa minor planets named after animals and plants)". 1104 Syringa 1104 Syringa, provisional designation , is a dark background asteroid from the central regions of the asteroid belt, approximately 23 kilometers in diameter. It was discovered on 9 December 1928, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after the flowering plant "Syringa" (lilac). "Syringa" is a non-family asteroid from the main belt's background population. It orbits the Sun in the intermediate asteroid belt at a distance of 1.7–3.5 AU once every 4 years and 3 months (1,558 days; semi-major axis of
1104 Syringa Calvin–Rehoboth Observatory in New Mexico, United States. 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. This minor planet was named after the genus