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Asteroid 624, the largest known Trojan asteroid, discovered in 1907 by the German astronomer August Kopff (1882–1960). It is a member of the group of Trojans at the L4 Lagrangian point 60° ahead of Jupiter. Hektor's brightness varies by a factor of three as it rotates with a period of 6.92 hours. The light curve indicates that Hektor is highly elongated, 150 × 300 km; alternatively, it might be dumbbell-shaped, two asteroids in contact, or a close binary. Hektor is a D-class asteroid. Its orbit has a semimajor axis of 5.238 AU, period 11.99 years, perihelion 5.12 AU, aphelion 5.36 AU, and inclination 18°.2.

Subjects: Astronomy and Astrophysics.

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