Orbital eccentricity
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| NEPTUNE
DATA |
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| Orbital parametres | ||||
| Distance from Sun (semimajor axis) | 4,498 million km | (30.07 AU) | ||
| Minimum distance (perihelion) | 4,453 million km | (30.27 AU) | ||
| Maximum distance (aphelion) | 4,543 million km | (29.87 AU) | ||
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Orbital eccentricity |
0.01 | |||
| Length of year (orbital period) | 60,189 days | (164.8 years) | ||
| Length of day (rotational period) | 16.07 hours | (0.67 days) | ||
| Average orbital velocity | 5.48 km/s | |||
| Orbital inclination | 1.77 degrees | |||
| Axial tilt (obliquity) | 28.8 degrees | |||
| Physical Properties | ||||
| Equatorial radius | 24,764 km | (3.88 x Earth) | ||
| Mass | 1.024 x1026 kg | (17.15 x Earth) | ||
| Volume | 6.254 x1014 km3 | (57.74 x Earth) | ||
| Average density | 1,640 kg/m3 | (0.297 x Earth) | ||
| Oblateness | 0.017 | |||
| Surface gravity at equator | 11.14 m/s2 | (1.139 x Earth) | ||
| Escape velocity | 23.49 km/s | (2.097 x Earth) | ||
| Solar irradiance | 1.47 Watts/m2 | (0.001 x Earth) | ||
| Surface temperature | 50 to 53 K | (-223 to -220o C) | ||
| Albedo | 0.41 | |||
| Maximum visual magnitude | +7.66 | |||
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