Black-Body Temperature

90.6 K

Bond Albedo

0.70

Ellipticity

0.0649

Equatorial Radius (Defined by Pressure = 1 bar)

71 492 km

Escape Velocity

59.5 km s⁻¹

GM

126.686 × 10⁶ km³ s⁻²

Mass

1 896.6 × 10²⁴ kg

Mean Density

1 326 kg m⁻³

Moment of Inertia

0.254 I MR⁻²

Polar Radius (Defined by Pressure = 1 bar)

66 854 km

Solar Irradiance

51.0 W m⁻²

Surface Gravity (At Pressure = 1 bar)

23.12 m s⁻²

Visual Geometric Albedo

0.52

Visual Magnitude

−9.40

Volume

143 128 × 10¹⁰ km³

Volumetric Mean Radius

69 911 km

Aphelion

816.0 × 10⁶ km

Mean Orbital Velocity

13.07 km s⁻¹

Obliquity to Orbit

3.12°

Orbital Eccentricity

0.048 39

Orbital Inclination

1.305°

Perihelion

740.6 × 10⁶ km

Semimajor Axis

778.4 × 10⁶ km

Sidereal Orbit Period

4 332.589 days

Sidereal Rotation Period (System III coordinates)

9.9250 hours

Synodic Period

398.88 days

Tropical Orbit Period

4 330.595 days

Apparent Magnitude near Opposition

-2.7

Maximum Apparent Diameter from Earth

59.0 arc seconds

Maximum Distance from Earth

968.1 × 10 6 km

Minimum Apparent Diameter from Earth

29.8 arc seconds

Minimum Distance from Earth

588.5 × 10 6 km

Average Temperature

129 K

Mean Molecular Weight

2.22 g mol⁻¹

Surface Pressure

More than 100 bars

Surface Wind Speeds (Over 30° lat.)

Up to 40 m s⁻¹

Surface Wind Speeds (Under 30° lat.)

Up to 150 m s⁻¹