S/1986 U 10 is an unnamed moon of Uranus. It is about 20 km in diameter. Its orbit lies between those of Belinda and Puck.
Its name suggests that it was discovered in 1986, but this is deceptively simple. The first photographs of it were taken by the Voyager 2 spacecraft in 1986, but it was not recognized that there was a moon in those photographs for more than a decade. In 1999, the moon was noticed by Erich Karkoschka and reported. But because no further pictures could be taken to confirm its existence, it was officially demoted in 2001.
But then, in 2003, pictures taken by the Hubble Space Telescope managed to pick up an object where S/1986 U 10 was supposed to be, confirming its existence. The moon has not yet been named, but as it has now been confirmed it is expected to be given a name within a few years.