Asteroids mostly have circular orbits. Comets (at least the ones we see) tend to have very highly eliptical orbits. That I think is the origin of the distinction.
But asteroids also tend to be at lower distances from the sun than comets. That in turn leads to them tending to be composed more of rocky material, whereas comets have more ice.
I am not an astronomer, so any and all details may be in error. Corrections are welcome.
But asteroids also tend to be at lower distances from the sun than comets. That in turn leads to them tending to be composed more of rocky material, whereas comets have more ice.
I am not an astronomer, so any and all details may be in error. Corrections are welcome.