11509 Thersilochos was discovered by E. W. Elst (discovered close to 4000 minor planets) on 15 November 1990 and it is named after Thersilochus
It was discovered on 15 November 1990, by Belgian astronomer Eric Elst at the La Silla Observatory in northern Chile. 15 November 1990 It was named after the Trojan warrior Thersilochus from Greek mythology. Minor planets discovered: 3868 
E. W. Elst 15 November 1990 Thersilochus
(Greek mythology) Minor planets discovered: 3868 
