This list covers 6 moons with names that start with the letter B, ranging from “Bebhionn” to “Bianca.” Most of them are small, irregular moons that orbit the outer planets of our solar system, especially Saturn and Uranus. They range from tiny captured objects just a few kilometers wide to inner moons that travel within a planet’s ring system.

Moons are natural satellites held in orbit around a planet by gravity, and our solar system contains hundreds of them. Scientists are still discovering new ones today, often during large telescope surveys of distant planets. Saturn alone hosts more than 100 confirmed moons, making it one of the richest hunting grounds for new discoveries.

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

Moon: The official name of each moon, assigned by the International Astronomical Union, so you can look it up in any reference.

Parent Planet: The planet each moon orbits, which tells you what region of the solar system it belongs to.

Diameter (km): The approximate size of the moon in kilometers, giving you a quick sense of how large or small it is.

Discovery Year: The year the moon was first identified, which often reflects the spacecraft missions or survey tools that made it possible.

Description: A short summary of each moon’s key traits, mythology behind its name, and how it was found, so you can understand what makes it notable.

Moons

MoonParent PlanetDiameter (km)Discovery Year
BebhionnSaturn62004
BelindaUranus901986
BeliSaturn42004
BergelmirSaturn62004
BestlaSaturn72004
BiancaUranus511986

Descriptions

Bebhionn
A tiny irregular moon of Saturn named after Bebhionn, an Irish goddess of joy. It was found in a major survey of Saturn’s outer moons and follows a distant retrograde orbit.
Belinda
An inner moon of Uranus discovered by the Voyager 2 spacecraft. Named after a character in Alexander Pope’s poem “The Rape of the Lock,” it orbits within Uranus’s faint ring system.
Beli
A very small irregular moon of Saturn in the Norse satellite group, named after Beli, a figure slain by the god Freyr in Norse mythology. Almost nothing is known about its surface.
Bergelmir
A small retrograde irregular moon of Saturn named after Bergelmir, the frost giant who survived the primordial flood in Norse myth. It orbits far from Saturn among the Norse group satellites.
Bestla
A tiny irregular moon of Saturn named after Bestla, the frost giantess and mother of Odin in Norse mythology. It travels on a distant retrograde orbit and was discovered during a 2004 survey.
Bianca
An inner moon of Uranus found by Voyager 2 and named after Bianca from Shakespeare’s “The Taming of the Shrew.” It orbits deep within Uranus’s ring region and has a dark, roughly ellipsoidal shape.
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