English

Alternative forms

• planetary body

Noun

planetary object ‎(plural planetary objects)

1. (astronomy) 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. (astronomy) Any substantial body in orbit around the Sun or other star: a planet, minor planet, or comet.
3. (astronomy) 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.

See also

• planemo