Neptune

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Neptune
Neptune is the eighth and farthest known planet from the Sun in the Solar System. It is the fourth-largest planet by diameter and the third-largest by mass. Among the giant planets in the Solar System, Neptune is the most dense. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune. Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units. Neptune - Wikipedia, the free encyclopedia
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Short Description Neptune is the eighth and farthest known planet from the Sun in the Solar System. It is the fourth-largest planet by diameter and the third-largest by mass. Among the giant planets in the Solar System, Neptune is the most dense. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune. Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units. Neptune - Wikipedia, the free encyclopedia
Discovered by Urbain Le Verrier, Johann Galle, Heinrich Louis d'Arrest
Discovery date 23 September 1846
Type Planet
AddInfo Ice giant
Satellite of Sun
Orbit Prograde
Rotation Direct
Satellites Has satellites, Has rings
Magnetosphere Intrinsic
Atmosphere Stable
Shape Equilibrium spheroid
Apoapsis 10 4 540 000 000 km
Periapsis 10 4 460 000 000 km
Semi-major axis 10 4 504 450 000 km
Distance from Sun 02 30.110 387 au
Eccentricity 0.009 456
Orbital period 164.8 year | 60,182 days | 89,666 Neptunian solar days
Synodic period 367.49 days
Orbital speed 01 5.43 km/s
Mean anomaly 256.228°
Inclination to the ecliptic 001.767975°
Inclination to the equator 006.43°
Longitude of the ascending node 131.784°
Argument of periapsis 276.336°
Diameter/Size 05 49 244 ± 38 km
Flattening 0.017 1 ± 0.001 3
Mass 1026×1.0243 kg | 17.147 Earths
Density 01 1.638 g/cm3
Surface gravity 01 11.15 m/s2 | 1.14 g
Escape velocity 05 23 500 m/s
Rotation period 0.6713 day | 16 hour 6 min 36 s
Equatorial rotation velocity 04 2 680 m/s
Axial tilt 028.32°
North pole right ascension 299.3°
North pole declination 042.950°
Albedo Bond 0.290
Albedo geometric 0.41
Temperature mean 02 72 K | −201 °C | 1 bar level
Apparent magnitude 8.02 to 7.78
Angular diameter 2.2–2.4″
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