The Tilted Ice Giant
Radius: 25,559 km (4× Earth)
Mass: 14.5× Earth (8.681×10²⁵ kg)
Rotation: 17.24 hours (retrograde)
Axial Tilt: 97.77° (sideways!)
Orbital Period: 84 Earth years
Gravity: 8.87 m/s² (0.9× Earth)
82.5% Hydrogen, 15.2% Helium
2.3% Methane (creates blue color)
Temperature: -224°C (coldest planet)
Wind speeds: Up to 900 km/h
• 13 rings discovered in 1977
• ε (Epsilon) ring: brightest and densest
• Extremely dark (2-5% reflectivity)
• Particles: 20cm to 20m diameter
• Shepherd moons: Cordelia & Ophelia
27 Known Moons:
• 5 Major: Miranda, Ariel, Umbriel, Titania, Oberon
• 13 Inner: Including Puck, Cordelia, Ophelia
• 9 Irregular: Retrograde & distant orbits
All major moons are tidally locked
• Only planet rolling on its side
• 42-year polar seasons
• Magnetosphere offset by 1/3 radius
• Magnetic field tilted 58.6° from axis
• Possible subsurface oceans on large moons
• Discovered: 1781 by William Herschel
• Visited: Voyager 2 (1986)
• Future: Proposed orbiter missions