One is ahead of the gas giant planet in its orbit (the Greek camp) and the other is trailing Jupiter (the Trojan camp). These ...

The Trojan asteroids around Jupiter are named for characters from the ancient Trojan War, a legendary 10-year conflict in Greek mythology that fictionally took place in the 13th or 12th century ...

They have been categorised into two loose groups - one group (named the Greek camp) always moves ahead of Jupiter in the path, while the second group (named the Trojan camp) is always behind Jupiter.