3540 Protesilaos 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 Protesilaus who fought during the Trojan War. It was discovered by Freimut Börngen at the Karl Schwarzschild Observatory in Tautenburg Germany on October 27 1973.
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