Centaur (small Solar System body)
Centaurs are small Solar System bodies with either a perihelion or a semi-major axis between those of the outer planets. They generally have unstable orbits because they cross or have crossed the orbits of one or more of the giant planets; almost all their orbits have dynamic lifetimes of only a few million years, but there is one Centaur, 514107 Kaʻepaokaʻawela, which may be in a stable (though retrograde) orbit.[how is this a centaur if the Trojans aren't?] Centaurs typically behave with characteristics of both asteroids and comets. They are named after the mythological centaurs that were a mixture of horse and human. Observational bias toward large objects makes determination of the total Centaur population difficult. Estimates for the number of Centaurs in the Solar System more than 1 km in diameter range from as low as 44,000 to more than 10,000,000
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