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Asteroid 588, the first Trojan asteroid to be discovered, by Max Wolf in 1906. It is a member of the group of Trojans at the L4 Lagrangian point 60° ahead of Jupiter. Achilles is a D-class asteroid of diameter 135 km. Its orbit has a semimajor axis of 5.195 AU, period 11.84 years, perihelion 4.43 AU, aphelion 5.96 AU, and inclination 10°.3.

Subjects: Astronomy and Astrophysics.

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