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:
- Venus Trojans (1)
- Earth trojans (1)
- Mars trojans (7)
- Jupiter trojans (6000+)
- Uranus trojans (1)
- Neptune trojans (13)
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.
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