An asteroid belonging to one of two groups that orbit the sun at the same distance as Jupiter, at the Lagrangian points roughly 60 degrees ahead of it and behind it.
- There are two groups of Trojan asteroids, both sharing Jupiter's orbit.
- A so-called Trojan asteroid, which forms a triangle with Jupiter and the sun, moves according to such a scheme.
- These are the Trojan asteroids, each one locked in its solar orbit by the gravity of Jupiter and the Sun.
Early 20th century: so named because the first asteroids discovered were named after heroes of the Trojan War.
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Syllabification: Tro·jan as·ter·oid
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