Io (moon)

Parent body:

pron.: /ˈaɪ.oʊ/[6] is the innermost of the four Galilean moons of the planet Jupiter and, with the diameter of 3,642 kilometres (2,263 mi), the fourth-largest moon in the Solar System. It was named after the mythological character of Io, the priestess of Hera who became one of the lovers of Zeus.

The area of Io is yellow and orange. The moon hasn't got own light, like Callisto, Europa...