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Asteroids with satellites are natural laboratories to constrain the formationand evolution of our solar system. The binary Trojan asteroid (624) Hektor isthe only known Trojan asteroid to possess a small satellite. Based on W.M. Keckadaptive optics observations, we found a unique and stable orbital solution,which is uncommon in comparison to the orbits of other large multiple asteroidsystems studied so far. From lightcurve observations recorded since 1957, weshowed that because the large Req=125-km primary may be made of two jointlobes, the moon could be ejecta of the low-velocity encounter, which formed thesystem. The inferred density of Hektor's system is comparable to the L5 Trojandoublet (617) Patroclus but due to their difference in physical properties andin reflectance spectra, both captured Trojan asteroids could have a differentcomposition and origin.

The Puzzling Mutual Orbit of the Binary Trojan Asteroid (624) Hektor