double planet

English

double planet (plural double planets)

(astronomy) A planet with a moon large enough to be considered a planet, were the planet not there, having a substantial portion of the system's overall mass.
(astronomy) A pair of planemos in orbit around each other, where the barycenter of their orbits lies outside of both planemos, which in turn is in orbit about a star.
(astronomy) A pair of planemos in orbit around each other, where the barycenter of their orbits lies outside of both planemos.
(astronomy) A planemo with a moon large enough to be considered a planemo, having a substantial portion of the system's overall mass.