planetary object

English

Alternative forms

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
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