Black-Body Temperature

35.9 K

Bond Albedo

0.90

Ellipticity

0.023

Equatorial Radius (Defined by Pressure = 1 bar)

25 559 km

Escape Velocity

21.3 km s⁻¹

GM

5.794 × 10⁶ km³ s⁻²

Mass

86.83 × 10²⁴ kg

Mean Density

1 318 kg m⁻³

Moment of Inertia

0.225 I MR⁻²

Polar Radius (Defined by Pressure = 1 bar)

24 973 km

Solar Irradiance

3.71 W m⁻²

Surface Gravity (At Pressure = 1 bar)

8.69 m s⁻²

Visual Geometric Albedo

0.51

Visual Magnitude

−7.19

Volume

6 833 × 10¹⁰ km³

Volumetric Mean Radius

25 362 km

Aphelion

3 005.2 × 10⁶ km

Mean Orbital Velocity

6.82 km s⁻¹

Obliquity to Orbit

97.86 °

Orbital Eccentricity

0.047 18

Orbital Inclination

0.770 °

Perihelion

2 734.0 × 10⁶ km

Semimajor Axis

2 871.0 × 10⁶ km

Sidereal Orbit Period

30 685.4 days

Sidereal Rotation Period (Magnetic Coordinates, determined by Voyager 2 Radio Science Experiment)

17.24 hours

Synodic Period

369.66 days

Tropical Orbit Period

30 588.740 days

Apparent Magnitude near Opposition

5.5

Maximum Apparent Diameter from Earth

4.1 arc seconds

Maximum Distance from Earth

3 157.3 × 10⁶ km

Minimum Apparent Diameter from Earth

3.3 arc seconds

Minimum Distance from Earth

2 581.9 × 10⁶ km

Average Temperature

about 58 K

Density at 1 bar

about 0.42 kg m⁻³

Mean Molecular Weight

2.64 g mol⁻¹

Scale Height

59.6 km

Scale Height

27.7 km

Surface Pressure

Much more than 100 bars

Temperature at 1 bar

about 76 K

Wind Speeds

0 to 200 m s⁻¹