For Ghosts who travel the labyrinths of Nessus.
- Planetoid (a type of icy minor planet)
- In the centaur region of our outer solar system in the Kuiper belt
- Small solar system bodies with a semi-major axis between those of the outer planets
- They have unstable orbits because they cross or have crossed the orbits of one or more of the giant planets; almost all their orbits have dynamic lifetimes roughly only a few million years
- Typically behave with characteristics of both asteroids and comets
- Named after the mythological centaurs that were a mixture of horse and human