Amongst the five main moons that orbit Uranus, Umbriel's distances is third, right in the middle. It's also the third largest moon of Uranus too, right after Titania and Oberon. It has quite a low orbital period of 4.1 days, and during this, it is always faced towards the planet (which we call a tidally locked moon). It takes Uranus 84 years to orbit Earth. This means that Umbriel spends half of this time facing the Sun, and the other half sheltered away behind the big body of Uranus.