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Mass: 1.024 X 1026 kg (17.14 Earths)
Radius (equatorial): 24 746 km
Mean density: 1.64 g cm-3
Distance from Sun:: 4 504 300 000 km
Rotational period: 16.11 hours
Orbital period: 164.79 years
Escape velocity: 23.50 km s-1
Apparent magnitude: 7.84
Surface temperature: -173°C (mean, cloud)
Atmospheric composition: hydrogen (85%), helium (13%), methane (2%)
Number of satellites: 8 (Triton, Nereid, Proteus etc.)
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