Planet Neptune

With terraformed moons of its own, this has become a very populated part of the Sun solar system, and is still home to one civilization of aliens who use spherical Spaceships and life-like human disguises.

 

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Table of Contents:

1. Spec’s
2. Moons
3. History
4. Images

 

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Planet Info:

Like all the gas giants in the Sun solar system, Neptune has a ‘great eye’ storm, polar aurora vortexes, a ring system, and much smaller moons.

Discovery[1]
Discovered by	Johann Galle Urbain Le Verrier
Discovery date	23 September 1846
Designations
Pronunciation	/ˈnɛptjuːn/ (listen)[2]
Adjectives	Neptunian
Orbital characteristics[3][a]
Epoch J2000
Aphelion	30.33 AU (4.54 billion km)
Perihelion	29.81 AU (4.46 billion km)
Semi-major axis	30.11 AU (4.50 billion km)
Eccentricity	0.009456
Orbital period	164.8 yr 60,182 days 89,666 Neptunian solar days[4]
Synodic period	367.49 days[5]
Average orbital speed	5.43 km/s[5]
Mean anomaly	256.228°
Inclination	1.767975° to ecliptic  6.43° to Sun‘s equator  0.72° to invariable plane[6]
Longitude of ascending node	131.784°
Argument of perihelion	276.336°
Known satellites	14
Physical characteristics
Mean radius	24,622±19 km[7][b]
Equatorialradius	24,764±15 km[7][b]  3.883 Earths
Polar radius	24,341±30 km[7][b]  3.829 Earths
Flattening	0.0171±0.0013
Surface area	7.6183×109 km2[8][b]  14.98 Earths
Volume	6.254×1013 km3[5][b]  57.74 Earths
Mass	1.02413×1026 kg[5]  17.147 Earths  5.15×10−5 Suns
Mean density	1.638 g/cm3[5][c]
Surface gravity	11.15 m/s2[5][b]  1.14 g
Moment of inertia factor	0.23[9] (estimate)
Escape velocity	23.5 km/s[5][b]
Sidereal rotation period	0.6713 day[5]  16 h 6 min 36 s
Equatorial rotation velocity	2.68 km/s (9,650 km/h)
Axial tilt	28.32° (to orbit)[5]
North pole right ascension	19h 57m 20s[7]  299.3°
North pole declination	42.950°[7]
Albedo	0.290 (bond)[10]  0.442 (geom.)[11]
Surface temp. min mean max 1 bar level 72 K (−201 °C)[5] 0.1 bar (10 kPa) 55 K (−218 °C)[5]
Apparent magnitude	7.67[12] to 8.00[12]
Angular diameter	2.2–2.4″[5][13]
Atmosphere[5]
Scale height	19.7±0.6 km
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)

Further details here.

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Neptune’s Moons:

There are 14 publicly-acknowledged moons of this gas giant.  Keeping with the deities-based naming system for all of the planets in the Sun solar system, Neptune’s moons are named after minor water deities; the moons’ names reflect the nature of the planet’s namesake deity.

Details here and here.

 

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History:

TBA

 

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