Umbriel
Umbriel (Uranus II) is a moon of Uranus, discovered by William Lassell in 1851. It orbits Uranus every 4.1 days and shines at about magnitude 14.9.
The darkest of the large Uranian moons, and the hardest of the four to catch.
Other moons of Uranus: Miranda, Ariel, Titania, Oberon.
Open AstroPilot to see where Umbriel is next to Uranus tonight and how easy it is with your telescope.