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 of 0.34 and an inclination of 6° with respect to the ecliptic. For a main-belt asteroid, it has a rather high eccentricity. The body's observation arc begins at Heidelberg on 1 January 1929, three weeks after its official discovery observation. In the SMASS classification, "Syringa" is a Xk-subtype that transitions between the X- and the dark and uncommon K-type asteroids. It has also been characterized as an X-type by Pan-STARRS photometric survey, and as a primitive P-type asteroid by the Wide-field Infrared Survey Explorer (WISE). In February 2006, a rotational lightcurve of "Syringa" was obtained from photometric observations at the