Moonlet

A moonlet, minor moon, minor natural satellite, or minor satellite is a particularly small natural satellite orbiting a planet, dwarf planet, or other minor planet.

Up until 1995, moonlets were only hypothetical components of Saturn's F-ring structure, but in that year, the Earth passed through Saturn's ring plane.

The Hubble Space Telescope and the European Southern Observatory both captured objects orbiting close or near the F-ring.

In 2004, Cassini caught an object 4–5 kilometers in diameter on the outer ring of the F-ring and then 5 hours later on the inner F-ring, showing that the object had orbited.

[1] Several different types of small moons have been called moonlets: List of moonlets

The 400-meter moonlet Earhart in Saturn's A Ring , just outside the Encke Gap
Another image of Earhart
Another moonlet named Bleriot
A moonlet named Santos-Dumont
A moonlet in Saturn's A ring