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1647 Menelaus
1647 Menelaus, provisional designation 1957 MK, is a carbonaceous asteroid, about 44 kilometers in diameter. It is a Jupiter Trojan that shares the orbit of the gas giant Jupiter. It was discovered by American astronomer Seth Nicholson at Mount Wilson Observatory northeast of Los Angeles, California, on 23 June 1957.〔
The C-type Trojan asteroid orbits in the so-called Greek Camp – the Lagrangian point of the Sun–Jupiter system. It therefore orbits the Sun at a distance of 5.1–5.3 AU once every 11 years and 11 months (4,352 days). Its orbit also shows a low eccentricity of 0.02 that is tilted by 6 degrees to the plane of the ecliptic. It has a rotation period of 17.7 hours〔 and an assumed albedo of 0.057.〔
The Trojan asteroid was named after the Greek mythological figure, Menelaus, husband of Helen of Troy, brother of Agamemnon, and king and leader of the Spartan contingent of the Greek army during Trojan War. The name was selected by the discoverer to enable another of the famous Greek heroes to join the majority of his compatriots in the camp to the east of Jupiter. The ''Dictionary of Minor Planet Names'' also mentions that the lunar crater ''Menelaus'' was named after the Greek hero.〔 However, based on the official International Astronomical Union–WGPSN nomenclature, it is named after Greek geometer and astronomer Menelaus of Alexandria (70–140).〔
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