Because the person who discovered it named it the moon like the person who discovered Jupiter called it Jupiter.
Thanks for spearing the time to read this.
A moon? I don't think a planet orbiting another planet would be called a planet.
Neptune. Its largest moon is called Triton.Neptune
Ceres is not called a moon because it orbits the sun and not a planet.
The planet PLUTO has a satellite named 'CHARON' . Pronounced 'Karon'.
That would be Titan - a moon of Saturn.
A natural satellite that orbits a planet is a moon
The fictional planet Tralfamadore is the moon of a large planet called Tran.
A small planet going round a big planet is called a moon. Like our moon, it is smaller than Earth - so all planets orbiting round a bigger planet is called a moon.
The planet is Saturn.
A moon
A moon? I don't think a planet orbiting another planet would be called a planet.
jupiter moon called IO
A moon.
This is Neptunes largest moon.
Ceres is not called a moon because it orbits the sun and not a planet.
Neptune. Its largest moon is called Triton.Neptune
It is the third largest moon of Saturn