Black-Body Temperature

33.2 K

Bond Albedo

0.82

Ellipticity

0.017 1

Equatorial Radius (Defined by Pressure = 1 bar)

24 766 km

Escape Velocity

23.5 km s⁻¹

GM

6.8351 × 10⁶ km³ s⁻²

Mass

102.43 × 10²⁴ kg

Mean Density

1 638 kg m⁻³

Polar Radius (Defined by Pressure = 1 bar)

24 342 km

Solar Irradiance

1.47 W m⁻²

Surface Gravity (At Pressure = 1 bar)

11.00 m s⁻²

Visual Geometric Albedo

0.41

Visual Magnitude

−6.87

Volume

6 254 × 10¹⁰ km³

Volumetric Mean Radius

24 624 km

Aphelion

4 535.2 × 10 6 km

Mean Orbital Velocity

5.48 km s⁻¹

Obliquity to Orbit

29.56 °

Orbital Eccentricity

0.008 59

Orbital Inclination

1.769 °

Perihelion

4 458.0 × 10⁶ km

Semimajor Axis

4 498.3 × 10⁶ km

Sidereal Orbit Period

60 189.0 days

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

16.11 hours

Synodic Period

367.49 days

Tropical Orbit Period

59 799.9 days

Apparent Magnitude near Opposition

7.8

Maximum Apparent Diameter from Earth

2.4 arc seconds

Maximum Distance from Earth

4 687.3 × 10⁶ km

Minimum Apparent Diameter from Earth

2.2 arc seconds

Minimum Distance from Earth

4 305.9 × 10⁶ km

Average Temperature

about 58 K

Density at 1 bar

about 0.45 kg m⁻³

Mean Molecular Weight

2.53 g mol⁻¹ to 2.69 g mol⁻¹

Scale Height

19.1 km to 20.3 km

Surface Pressure

Much more than 100 bars

Temperature at 1 bar

about 72 K

Wind Speeds

0 to 200 m s⁻¹