Black-Body Temperature

216.6 K

Bond Albedo

0.16

Core Radius

1700 km

Ellipticity

0.0065

Equatorial Radius

3397 km

Escape Velocity

5.03 km s⁻¹

GM

0.04283 × 10⁶ km 3 s^-2

Mass

0.6419 × 10²⁴ kg

Mean Density

3933 kg m⁻³

Moment of Inertia

0.366 I MR⁻²

Polar Radius

3375 km

Solar Irradiance

595 W m⁻²

Surface Gravity

3.69 m s⁻²

Topographic Range

36 km

Visual Geometric Albedo

0.150

Visual Magnitude

−1.52

Volume

16.318 × 10¹⁰ km³

Volumetric Mean Radius

3390 km

Aphelion

249.3 × 10 6 km

Mean Orbital Velocity

24.13 km s⁻¹

Obliquity to Orbit

25.19°

Orbital Eccentricity

0.0934

Orbital Inclination

1.85°

Perihelion

206.6 × 10⁶ km

Semimajor Axis

227.9 × 10⁶ km

Sidereal Orbit Period

686.980 days

Sidereal Rotation Period

24.6229 hours

Synodic Period

779.94 days

Tropical Orbit Period

686.930 days

Apparent Magnitude near Opposition

−2.0

Maximum Apparent Diameter from Earth

25.7 arc seconds

Maximum Distance from Earth

401.3 × 10⁶ km

Minimum Apparent Diameter from Earth

3.5 arc seconds

Minimum Distance from Earth

54.5 × 10⁶ km

Average Temperature

210 K

Diurnal Temperature Range

184 K to 242 K

Mean Molecular Weight

43.34 g mol⁻¹

Scale Height

11.1 km

Surface Density

0.020 kg m⁻³

Surface Pressure

6.9 mbars to 9 mbars

Surface Wind Speeds - Autumn

2 to 4 m s⁻¹

Surface Wind Speeds - Dust Storm

17 to 30 m s⁻¹

Surface Wind Speeds - Summer

5 to 10 m s⁻¹