Which satellites have the smallest orbits?

The radius of the orbit of the satellite of Mars Phobos is 9378 km, the radius of the orbit of the satellite of Pluto Charon is 19,100 km.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.