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Ariel > Umbriel > Titania  
General
 
Characteristics:

Mass: (1.172 ± 0.135 × 1021 kg[1]


Radius: 584.7 ± 2.8 km[1]


Density: 1.39 ± 0.16 g/cm3[1]


Orbital period: 4.144 Earth days[1]


Rotation period: presumed synchronous[1]


Atmosphere: None known[1]


Surface temperature: ~75 K K[1]

 
Discovery Information:

Discovery date: October 24, 1851


Discoverer(s): William Lassell

   

PIA00040 Umbrielx2.47

Umbriel

Umbriel is also known as Uranus II.

Trivia

Sources

Wikipedia.org

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