dwarf planetdwarf planet
a solid body, approximately spherical but typically smaller than a conventional planet, that orbits a star: its general orbital area may be shared by other bodies of significant size
A celestial body that orbits the sun and is massive enough to assume a nearly spherical shape, but that does not clear other bodies from the neighborhood around its orbit and is not a satellite of a planet. See Usage Note at planet.
(plural dwarf planets)
- (astronomy) Any astronomical body which has achieved hydrostatic equilibrium (which is the shape a body of water would take, as opposed to a small Solar System body), orbits the Sun (as opposed to a moon), and has not "cleared its neighbourhood" of competing bodies (as opposed to a planet).
- minor planet
- major planet
- planetary object