Trojan asteroid

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Trojan asteroid refers to asteroids orbiting in the 4th and 5th Lagrange points of major planets in the Solar System. Currently there are six planets known to have trojans:

It is possible Mercury and Saturn have trojan asteroids, but none have been discovered so far due to; Mercury's close proximity to the Sun hinders the observation of such objects, and Saturn's proximity to Jupiter throwing possible would-be trojans out of a stable orbit with Saturn.