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- Planet statistics
- Distance from the Sun
- (in millions)
- Maximum: 154.5 miles
- 249.2 km
- 1.667 AU
- Minimum: 128.5 miles
- 206.7 km
- 1.381 AU
- Mean: 141.5 miles
- 227.9 km
- 1.524 AU
-
- Period of revolution
- ("one year"):
- 687.0 days = 1.88 years (Earth??) 779.9 days
-
- Period of rotation (equatorial): 24 hr. 37 min. 23 sec.
-
- Mean orbital velocity per second: 15 miles (24.1 km)
-
- Inclination of axis: 23.98
- Orbital eccentricity: 0.093
- Orbital inclination: 1.85░
-
- Diameter at equator:
- 4,222 miles
- 6,794 km
- (Earth???)
-
- Oblateness: 0.006
-
- Escape velocity per second: 3.2 miles (5.0 km)
-
- Mean surface temperature:
- -9 F / -23 C / 250░ K
-
- Mass: 6.42 x 10^23 kg
- (Earth = 1): 0.107
-
- Volume (Earth =1): 0.15
-
- Density (water = 1): 3.94
-
- Surface gravity: 3.72 m/s^2
- (Earth = 1): 0.38
-
- Maximum apparent diameter as seen from Earth
- (seconds of arc): 25".7
-
- Mean diameter of Sun as seen from the planet:
- 21' 00"
-
- Albedo: 0.16
-
- Number of known satellites: 2
-