3391 Sinon is a Jupiter Trojan asteroid that orbits in the L4 Lagrangian point of the Sun-Jupiter system in the Greek Camp of Trojan asteroids. It was named after the Greek hero Sinon who was a warrior during the Trojan War. It was discovered by Hiroki Kosai and Kiichiro Hurukawa at the Kiso Observatory in Japan on February 18 1977.
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