Moon

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The real life near-Earth asteroid Eros

A captured asteroid is a moon which was previously a asteroid and was then captured by another planet. Some the moons in Kerbal Space Program are considered giant captured asteroids. In real life, almost all the moons in the solar system are asteroids caught in a planet's gravity. The in-game moons include; Gilly, Bop and Pol.

Moons being classified as captured asteroids is based purely on observation. There is no difference between them and other celestial bodies in terms of game mechanics. Because asteroids are significantly smaller than classic moons their gravity is very weak. An indicator to classify captured asteroids in KSP is to compare the sphere of influence with the semi major axis. The captured asteroids have all a ratio of below 0.01.