Umbriel

Introduction
Umbriel, also known as Uranus II, is a moon of Uranus with a Rocky Core and Icy Mantle. Umbriel has a mass of (1.275±0.028)×1021 kilograms, a radius of 584.7±2.8 kilometers and a surface area of 4296000 kilometers squared, which makes Umbriel the third largest moon of Uranus. Umbriel has an orbital period of 4.114 Earth Days and an average orbital speed of 4.67 kilometers per second. Umbriel has a mean temperature of approximately 75 Kelvin or negative 198.15 degrees Celsius and a Maximum temperature of 85 Kelvin or negative 188.15 degrees Celsius.  
Profile of Umbriel
Umbriel was discovered on October 24th, 1851 by English Astronomer William Lassell who discovered Umbriel at the same time as he discovered another moon named Ariel. Umbriel, the moon, was named after a character in English Poet Alexander Pope's play, The Rape of the Lock, who is a dusky melancholy sprite. Umbriel is the darkest of all the Uranian moons since it reflect the least amount of light given by The Sun. Umbriel has a good number of craters whose names are Gob, Wunda, Wokolo, Fin, Minepa, Peri, Alberich, Zlyden, Malingee, Setibos, Skynd, Vuver & Kanaloa. On the surface of Umbriel is water(H20) and Carbon Dioxide(CO2).