OK, I've thought more about it. Here's my suggestion for the IAU (actually, S&T editor in chief Rick Fienberg said he made similar suggestions to the astronomers already):
There are eight planets. Everything else is an asteroid. That would leave moons as moons (a.k.a. satellites) and leave comets as a separate class of object. Asteroid is a perfectly fine word. No need for "minor" or "dwarf" planets or "small solar system objects."
We have main-belt asteroids, near-Earth asteroids, Trojan asteroids, Centaur asteroids, and Kuiper-belt asteroids (like Pluto) — all which will be managed by the, uh, Asteroid Center.
We'll worry about extrasolar planets and "rogue" planets (loner worlds unattached to stars — like the Moon was in Space: 1999) later.
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