Bebhionn is a moon of Saturn, part of the Solar System in the universe. Saturn is a planet associated with the Sun, our star, and this space encyclopedia describes the moon’s identity and place in its planetary system.

Bebhionn — A natural satellite of Saturn. Its physical properties and orbital motion are shown from the available catalogue and ephemeris data.

No object-specific chemical/elemental dataset has been verified and imported for this record. This does not mean none is publicly available. Appearance may be imagined; chemistry is not.

Discovery and designation
Bebhionn was discovered in 2004. JPL credits S. Sheppard, D.C. Jewitt, J. Kleyna. Its provisional designation is S/2004 S11. The name and discovery entry identify this particular satellite of Saturn; similarly named asteroids are separate objects.

Bebhionn has a mean radius of 1.9 miles (3 km), assuming an albedo (a measure of how reflective the surface is) of 0.04. At a mean distance of 10.6 million miles (17.1 million km) from Saturn, the moon takes about 835 Earth days to complete one orbit.

Bebhionn is one of the four known members of the Gallic group of moons. These moons have prograde orbits (they travel around Saturn in the same direction as the planet's rotation), but their egg-shaped, angled orbits classify them as "irregular" moons. Like Saturn's other irregular moons, they are thought to be objects that were captured by Saturn's gravity, rather than having accreted from the dusty disk that surrounded the newly formed planet, as the regular moons are thought to have done.

The similarities among the orbits of moons in the Gallic group suggest a common origin—they may be fragments of a single object that shattered in a collision. The other members of this group are Albiorix, Erriapus, and Tarvos.

Originally called S/2004 S11, Bebhionn was named for a beautiful giantess in Celtic mythology. In one story, she escapes from Maidens' Land—which was populated entirely by women except for the king and his three sons—only to be slain by her giant husband, who was the son of the king of the Isle of Men.