planetary object

Noun

 * 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)  Any substantial body in orbit around the Sun or other star: a planet, minor planet, or comet.
 * 3)  Any substantial body associated with the development of planets: a protoplanet, planetesimal.

Usage notes
The phrase is often used for an unidentified body known to have complex geology, such as the unknown parent body of a meteorite.