This list covers 3 moons whose names start with the letter J, ranging from “Janus” to “Juliet”. These natural satellites orbit planets across our solar system and vary widely in size, origin, and appearance. Some are large enough to have been spotted centuries ago, while others were only confirmed in recent decades using modern telescopes and spacecraft.

Moons are natural objects that orbit a planet, bound in place by gravity rather than moving freely through space. Our solar system contains more than 200 known moons, from enormous worlds the size of small planets to tiny, irregular chunks of rock just a few kilometers across. Many carry names drawn from mythology and literature, a tradition that stretches back to the earliest days of telescopic astronomy.

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

Moon: The official name of each moon, as recognized by the astronomical community. Names often come from mythology tied to the parent planet’s own name.

Parent Planet: The planet each moon orbits. This helps you place each moon in the solar system and understand which missions or observatories might have found it.

Diameter (km): The approximate width of each moon in kilometers. This gives you a quick sense of scale, from city-sized rocks to larger, more rounded bodies.

Discovery Year: The year each moon was first confirmed and recorded. Earlier discoveries often came from simple visual observation, while recent ones relied on digital imaging and ground-based sky surveys.

Description: A short overview of each moon’s key traits, orbit, and standout features. This gives you a useful starting point for understanding what makes each moon worth knowing about.

Moons

Descriptions