Discovered by Johann Galle in 1846

Average Distance from the Sun

Metric: 4,498,252,900 km

English: 2,795,084,800 miles

Perihelion (closest)

Metric: 4,459,630,000 km

English: 2,771,087,000 miles

Aphelion (farthest)

Metric: 4,536,870,000 km

English: 2,819,080,000 miles

Equatorial Radius

Metric: 24,764 km

English: 15,388 miles

Equatorial Circumference

Metric: 155,597 km

English: 96,683 miles

Volume

Metric: 62,526,000,000,000 km3

Mass

Metric: 102,440,000,000,000,000,000,000,000 kg

Density

Metric: 1.76 g/cm3

Surface Area

Metric: 7,640,800,000 km2

English: 2,950,100,000 square miles

Equatorial Surface Gravity

Metric: 10.71 m/s2

English: 35.14 ft/s2

Escape Velocity

Metric: 85,356 km/h

English: 53,038 mph

Sidereal Rotation Period (Length of Day)

0.67125 Earth days

16.11 hours

Sidereal Orbit Period (Length of Year)

164.79 Earth years

60,190 Earth days

Mean Orbit Velocity

Metric: 19,720 km/h

English: 12,253 mph

Orbital Eccentricity

.00859

Orbital Inclination to Ecliptic

1.769 degrees

Equatorial Inclination to Orbit

29.58 degrees

Orbital Circumference

Metric: 28,142,000,000 km

English: 17,487,000,000 miles

Effective Temperature

Metric: -214 °C

English: -353 °F

Atmospheric Constituents

Hydrogen 85%

Helium 13%

Methane 2%

Moons:

1. Naiad

2. Thalassa

3. Despina

4. Nereid

5. Galatea

6. Larissa

7. Proteus

8. Triton

9. S/2002 N1

10. S/2002 N2

11. S/2002 N3

12. S/2002 N4

13. S/2003 N1