planet neptune data information and stats
PLANET NEPTUNE
Information on NEPTUNE STATISTICS
| Neptune Statistics
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| Discovered by | Johann Gotfried Galle
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| Date of discovery | September 23, 1846
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| Mass (kg) | 1.024e+26
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| Mass (Earth = 1) | 1.7135e+01
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| Equatorial radius (km) | 24,746
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| Equatorial radius (Earth = 1) | 3.8799e+00
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| Mean density (gm/cm^3) | 1.64
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| Mean distance from the Sun (km) | 4,504,300,000
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| Mean distance from the Sun (Earth = 1) | 30.0611
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| Rotational period (hours) | 16.11
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| Orbital period (years) | 164.79
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| Mean orbital velocity (km/sec) | 5.45
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| Orbital eccentricity | 0.0097
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| Tilt of axis (degrees) | 28.31
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| Orbital inclination (degrees) | 1.774
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| Equatorial surface gravity (m/sec^2) | 11.0
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| Equatorial escape velocity (km/sec) | 23.50
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| Visual geometric albedo | 0.41
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| Magnitude (Vo) | 7.84
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| Mean cloud temperature | -193 to -153°C
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| Atmospheric pressure (bars) | 1-3
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Atmospheric compositionHydrogenHeliumMethane
85%
13%
2%
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