planetary object

Short definition from Wiktionary

Noun

1. 1
   Any secondary body in the Solar system that is geologically differentiated or in hydrostatic equilibrium and thus has a planet-like geology: a planet, dwarf planet, or the larger moons and asteroids.
2. 2
   Any substantial body in orbit around the Sun or other star: a planet, minor planet, or comet.
3. 3
   Any substantial body associated with the development of planets: a protoplanet, planetesimal.