Uranus has five large moons and at least 22 small ones. The big satellites range between 230 and 790 kilometers (145 and 495 miles) in diameter, at distances from 130,000 to 583,000 kilometers (81,000 to 365,000 miles) from Uranus. From largest to smallest, these moons are Titania, Oberon, Umbriel, Ariel, and Miranda. All five were discovered before 1950.
Voyager 2 gave us our first and (so far) the only close-up look at these five moons of rock and ice.
Most intriguing is Miranda. It's a tiny world, just 500 kilometers (300 miles) across. But it tells a story of an active history of resurfacing through features usually seen on hot planets like Mercury and Venus. Does Miranda "boil over" from the heating effects of Uranus's tides? Or was it completely blown apart at some point, only to fall back together? We don't yet know.
The Voyager 2 mission discovered ten more moons during its 1986 flyby, with diameters between 13 and 77 kilometers (8 and 46 miles). All ten of these are inside the orbits of the five large moons, at distances ranging from 50,000 to 86,000 kilometers (30,000 to 51,600 miles).
Recently, several more distant moons have been discovered. All are outside the orbit of the five large moons, at distances ranging from seven million to 21 million kilometers (4.2 million to 12.6 million miles). These outer moons are likely captured asteroids.
At least 27 moons orbit Uranus, but the brightest are only 14th magnitude and beyond the view of most amateur telescopes. It might be best, for now, to observe them here in Starry Night!