planetary object

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English[edit]

Alternative forms[edit]

Noun[edit]

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[edit]

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[edit]