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https://www.spaceanswers.com/solar-system/what-is-the-smallest-size-a-satellite-can-become-a-moon/ https://www.spaceanswers.com/solar-system/what-is-the-smalle.

• baxtr 8y ago
  From the above article: So as it stands, a moon is simply any natural body in orbit around a planet or other non-stellar object (so asteroids can have moons, and it’s even possible for a moon to have its own moon, although none have been discovered so far).