Neptune Data
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: -
English: -
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