Neptune Has Trojans
Neptune Linked to Potential Swarm of Asteroids
Apparently we already knew it had one.
Astronomers have detected three new rocky bodies which share the same orbit as Neptune as it travels around the Sun.
The finding, detailed in the June 16 issue of the journal Science, brings the total number of the gas giant's asteroid companions, or “Trojans,” up to four.
The highly inclined orbit of one of them supports the hypothesis that the Neptune Trojans were captured from a much larger asteroid "cloud" that surrounds the planet, and that they are not the broken remains of some larger object as some scientists have speculated.
Everything I need to know I learned through Googling.