planeto

Planeto is a term used in some contexts to denote a small, planet-like body that orbits a star but does not meet the criteria for being classified as a planet under formal definitions. It is not part of the International Astronomical Union's official taxonomy. In mainstream astronomy, objects of similar size and nature are usually described as planetoids, minor planets, or, if large and gravitationally dominant enough to clear their orbits, dwarf planets.

Etymology and usage: The name planeto derives from the word planet with a diminutive suffix, reflecting its position between asteroids and full planets in common language. The term has appeared in older catalogs, educational writing, and some science-fiction contexts, but there is no single standardized definition.

Characteristics: Planetos are typically smaller than planets and dwarf planets. They may be nearly spherical if large enough for hydrostatic equilibrium, though many retain irregular shapes. Their composition can be rocky, icy, or mixed, reflecting diverse formation zones. Orbits around their stars are usually stable over long timescales, and some conceptually resemble miniature planets in their dynamics.

Classification and status: Because planeto is not an officially recognized category, there is no universal set of criteria or a canonical catalog. The concept is mainly encountered in historical discussions, speculative scenarios, or popular science and fiction rather than in formal astronomical classification.

In fiction and media: Planeto is frequently used to describe small, planet-like bodies in world-building or hypothetical studies, serving as a convenient label for objects intermediate in size between asteroids and planets.

See also: planetoid, dwarf planet, minor planet, asteroid, exoplanet.