This page covers 3 moons whose names start with the letter O, ranging from “Oberon” to “Orthosie.” These moons vary widely in size, origin, and behavior, from large geologically complex worlds to tiny captured asteroids orbiting distant gas giants. Together they offer a snapshot of the remarkable diversity found among planetary moons in our solar system.

Moons are natural satellites that orbit planets, held in place by gravity. Our solar system holds hundreds of them, and some are fascinating worlds in their own right — Jupiter alone has 95 known moons, more than any other planet. Many moons were discovered only recently, thanks to space probes and advances in telescope technology.

Below you’ll find the table with Moon, Parent Planet, Diameter (km), Discovery Year, and Description.

Moon: The name of each moon, listed alphabetically from O. You can use these names to look up more information or compare across different planets.

Parent Planet: The planet each moon orbits. This helps you quickly see which moons belong to the same planetary system.

Diameter (km): The approximate size of the moon in kilometers. This gives you a sense of scale, from tiny rocks just a couple of kilometers across to large moons bigger than some planets.

Discovery Year: The year each moon was first identified. Earlier discoveries were often made by eye or small telescope, while more recent ones came from space missions or powerful ground-based observatories.

Description: A brief summary of what makes each moon notable, including surface features, orbital behavior, or mythological origins of its name.

Moons

Descriptions