Neptune's Statistics

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Michael Ammar
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Picture Library
 Discovered by Johann Gotfried Galle 
 Date of discovery September 23, 1846 
 Mass (kg) 1.024e+26 
 Mass (Earth = 1) 1.7135e+01 
 Equatorial radius (km) 24,746 
 Equatorial radius (Earth = 1) 3.8799e+00 
 Mean density (gm/cm^3) 1.64 
 Mean distance from the Sun (km) 4,504,300,000 
 Mean distance from the Sun (Earth = 1) 30.0611 
 Rotational period (hours) 16.11 
 Orbital period (years) 164.79 
 Mean orbital velocity (km/sec) 5.45 
 Orbital eccentricity 0.0097 
 Tilt of axis (degrees) 28.31 
 Orbital inclination (degrees) 1.774 
 Equatorial surface gravity (m/sec^2) 11.0 
 Equatorial escape velocity (km/sec) 23.50 
 Visual geometric albedo 0.41 
 Magnitude (Vo) 7.84 
 Mean cloud temperature -193 to -153�C 
 Atmospheric pressure (bars) 1-3 
 Atmospheric composition
Hydrogen
Helium
Methane
85% 
13% 
2% 

 

Rings of Neptune

 

The following table is a summary of the rings of Neptune.

 

Name Distance* Width Thickness Mass Albedo
1989N3R 41,900 km 15 km ? ? low
1989N2R 53,200 km 15 km ? ? low
1989N4R 53,200 km 5,800 km ? ? low
1989N1R 62,930 km < 50 km ? ? low

*The distance is measured from the planet center to the start of the ring.

Neptune Moon Summary

The following table summarizes the radius, mass, distance from the planet center, discoverer and the date of discovery of each of the moons of Neptune:

 

Moon # Radius
(km) 		Mass
(kg) 		Distance
(km) 		Discoverer Date
 Naiad III 29 ? 48,000 Voyager 2 1989
 Thalassa IV 40 ? 50,000 Voyager 2 1989
 Despina V 74 ? 52,500 Voyager 2 1989
 Galatea VI 79 ? 62,000 Voyager 2 1989
 Larissa VII 104x89 ? 73,600 Voyager 2 1989
 Proteus VIII 200 ? 117,600 Voyager 2 1989
 Triton I 1,350 2.14e+22 354,800 W. Lassell 1846
 Nereid II 170 ? 5,513,400 G. Kuiper 1949

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Copyright � 1998 Michael Ammar.