Asteroid moon

From Simple English Wikipedia, the free encyclopedia
The asteroid 243 Ida and its moon Dactyl.

An asteroid moon is an asteroid that orbits or goes around another asteroid. Asteroid moons are quite rare. Only 2% of asteroids are thought to have moons.

To be an asteroid moon, an asteroid has to be smaller than the object it goes around. If they are roughly the same size they are called a binary pair.

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