Neptune Company Profile

Aggregated data from the web about Neptune

Company Name	Neptune
Website	https://en.wikipedia.org
Snippet	Neptune is the eighth and farthest-known Solar planet from the Sun.In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.It is 17 times the mass of Earth, slightly more massive than its near-twin Uranus.Neptune is denser and physically smaller than Uranus because its greater mass causes more gravitational compression of ...
Mass	1.02413×1026 kg[6]17.147 Earths5.15×10−5 Suns
Albedo	0.290 (bond)[13]0.442 (geom.)[14]
Volume	6.254×1013 km3[6][b]57.74 Earths
Aphelion	30.33 AU (4.54 billion km)
Adjectives	Neptunian /nɛpˈtjuːniən/,[3] Poseidean[4]
Axial tilt	28.32° (to orbit)[6]
Flattening	0.0171±0.0013
Perihelion	29.81 AU (4.46 billion km)
1 bar level
Inclination	1.767975° to ecliptic6.43° to Sun's equator0.72° to invariable plane[7]
Mean radius	24,622±19 km[10][b]
Named after	Latin Neptūnus, via French Neptune
Eccentricity	0.008678
Mean anomaly	256.228°
Mean density	1.638 g/cm3[6][c]
Polar radius	24,341±30 km[10][b]3.829 Earths
Scale height	19.7±0.6 km
Surface area	7.6183×109 km2[11][b]14.98 Earths
Discovered by	Johann Galle, Urbain Le Verrier
Pronunciation	/ˈnɛptjuːn/ (listen)[2]
Surface temp.	Surface temp.minmeanmax1 bar level72 K (−201 °C)[6]0.1 bar (10 kPa)55 K (−218 °C)[6]
Discovery date	23 September 1846
Orbital period	164.8 yr, 60,182 days, 89,666 Neptunian solar days[5]
Synodic period	367.49 days[6]
Escape velocity	23.5 km/s[6][b]
Semi-major axis	30.07 AU (4.50 billion km)
Surface gravity	11.15 m/s2[6][b]1.14 g
0.1 bar (10 kPa)
Angular diameter	2.2–2.4″[6][16]
Known satellites	14
Equatorial radius	24,764±15 km[10][b]3.883 Earths
Apparent magnitude	7.67[15] to 8.00[15]
Time of perihelion	2042-Sep-04[8]
Average orbital speed	5.43 km/s[6]
Composition by volume	Gases:, 80%±3.2% hydrogen (H2), 19%±3.2% helium (He), 1.5%±0.5% methane (CH4), ~0.019% hydrogen deuteride (HD), ~0.00015% ethane (C2H6), Ices:, ammonia (NH3), water (H2O), ammonium hydrosulfide (NH4SH), methane ice (?) (CH4·5.75H2O)
Argument of perihelion	276.336°
North pole declination	42.950°[10]
Moment of inertia factor	0.23[12] (estimate)
Sidereal rotation period	0.6713 day[6]16 h 6 min 36 s
North pole right ascension	19h 57m 20s[10]299.3°
Longitude of ascending node	131.784°
Equatorial rotation velocity	2.68 km/s (9,650 km/h)

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