It must come from a character in Greek or Roman mythology who was either a descendant or lover of the god known as Zeus (in Greek) or Jupiter (Latin). It must be 16 characters or fewer, preferably one word. It can’t be offensive, too commercial, or closely tied to any political, military or religious activities of the past 100 years. It can’t belong to a living person and can’t be too similar to the name of any existing moons or asteroids. If the moon in question is prograde (it circles in the same direction as its planet rotates) the name must end in an “a.” If it is retrograde (circling in the opposite direction), the name must end in an “e.”
→ The Washington Post. Even when sky isn’t the limit, there are some rules.