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|Look up planetary object in Wiktionary, the free dictionary.|
A planetary body or planetary object is any secondary body in the Solar System[dubious ] 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.
- Be low enough in mass that at no time (past or present) can it generate energy in its interior due to any self-sustaining nuclear fusion chain reaction.
- Be large enough that its shape becomes determined primarily by gravity rather than mechanical strength or other factors (such as surface tension or rotation rate) in less than a Hubble time, so that the body would on this timescale or shorter reach a state of hydrostatic equilibrium in its interior.
- Stern, S. Alan; Levison, Harold F. (2002), Rickman, H., ed., "Regarding the criteria for planethood and proposed planetary classification schemes", Highlights of Astronomy, San Francisco, CA: Astronomical Society of the Pacific, 12, pp. 205–213, Bibcode:2002HiA....12..205S, ISBN 1-58381-086-2. See p. 208.
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