Sedna

[ivan_2068]

Haley's Comet orbits the sun, as does Hale-Bopp (or whatever it's called) - not planets...

Well Yesspaz, the orbit of a comet is absolutely different to the orbit of a planet, it's not heliocentic because it crosses the orbits of other planets, the orbit of a planet is almost perfectly heliocentric and independant to other plamets, unless something really catastrophic happens).

Of course the comets have other features that planets don't have like tail, nucleus, coma, etc.

Iván