Answer:
The term minor planet is still used, but after reclassification in 2006 these are now generally referred to as dwarf planets. Dwarf planets orbit the sun, but are not satellites, that is to say that they do not orbit another planet, since then they would be classified as moons. They are big enough to hold an ellipsoid shape under their own gravity (like a squashed sphere), but have not cleared their orbit of other objects. That is to say that at the same distace out, there is a significant amount of other matter that is not part of the dwarf planet.