Oberon is one of the moons of Uranus, the seventh planet from the Sun. It was discovered by William Herschel in 1787, along with another major moon of Uranus, Titania. Oberon is named after the character Oberon, the king of the fairies in Shakespeare's play "A Midsummer Night's Dream."

Here are some key facts about Oberon:

Size and Composition: Oberon is the second-largest moon of Uranus and the ninth-largest moon in the solar system. It has a diameter of about 1,522 kilometers (945 miles). Oberon is composed of a mixture of rock and ice, with an outer layer of water ice.

Surface Features: Oberon's surface is covered in impact craters of various sizes. It has a heavily cratered terrain, suggesting an ancient surface. Some of the craters have diameters of over 200 kilometers (124 miles). The moon also has canyons and deep valleys, indicating past geological activity.

Orbital Characteristics: Oberon orbits Uranus at an average distance of about 583,500 kilometers (362,800 miles). It takes approximately 13.5 days to complete one orbit around Uranus.

Tectonic Activity: Similar to Titania, Oberon shows signs of tectonic activity, including fractures and rift valleys. This suggests that the moon underwent geological processes such as extension and contraction in the past.

Atmosphere: Oberon has an extremely thin and tenuous atmosphere composed mainly of molecular oxygen (O2) and traces of other gases. The origin of this atmosphere is believed to be from the moon's surface ice being bombarded by charged particles from Uranus' magnetosphere.

Exploration: Oberon has been primarily studied through observations made by telescopes from Earth and during the Voyager 2 spacecraft flyby of Uranus in 1986. No dedicated missions have been sent to explore Oberon specifically.