4902 Thessandrus /θɪˈsændrəs/ is a Jupiter trojan from the Greek camp, approximately 60 kilometers (37 miles) in diameter. It was discovered on 9 January 1989, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California, and later named after Thessander (Thessandrus) from Greek mythology. The dark D-type asteroid is an exceptionally slow rotator and tumbler. It belongs to the .