The term double planetoid does not appear in established astronomical literature, major scientific reference works, or widely recognized dictionaries. Consequently, it is not considered an established concept within the fields of astronomy, planetary science, or related disciplines.
Possible etymology and contextual usage
The word combines double, meaning "two" or "paired," with planetoid, a synonym for a small celestial body resembling a planet, often used to refer to asteroids or dwarf planets. In speculative contexts—such as science‑fiction narratives, informal discussions, or theoretical modeling—the phrase could plausibly describe:
- A binary system of two planetoids that orbit a common barycenter while individually orbiting a larger primary body (e.g., a star or planet).
- A single celestial object composed of two distinct lobes that are gravitationally bound, resembling a “contact binary” configuration similar to certain cometary nuclei (e.g., comet 67P/Churyumov–Gerasimenko).
- A conceptual classification for small bodies that exhibit characteristics of both asteroids and dwarf planets, perhaps in transitional size ranges (approximately 200–500 km in diameter).
Scientific status
No peer‑reviewed publications, International Astronomical Union (IAU) resolutions, or standardized terminology lists currently define or employ “double planetoid” as a formal classification. As such, the term lacks a precise, universally accepted definition and should be used with caution in academic or technical contexts.
