1229 Tilia is a dark Themistian asteroid and was discovered on 9 October 1931.
1229 Tilia /tli/ is a dark Themistian asteroid from the outermost regions of the asteroid belt, approximately 28 kilometers in diameter. It was discovered on 9 October 1931, by astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany, and given the provisional designation 1931 TP1. 
