Community Science Astronomy The Solar System Neptune

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Neptune

Arthur Dayne

@arthurdayne

Information on the astronomical development, evolution and properties of Neptune, the eighth (most distant) planet from the sun in the Milky Way.

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Arthur Dayne

@arthurdayne

Information on the astronomical development, evolution and properties of Neptune, the eighth (most distant) planet from the sun in the Milky Way.

Space School Neptune - Youtube

Learn about the planet Neptune on YouTube.
https://www.youtube.com/watch?v=EmUvTH7sveg
Neptune Facts for Kids - Science Kids

Neptune is a large planet that experiences extreme atmospheric weather conditions. After the demotion of Pluto, it now holds the distinction of being further away from the sun than any other planet in our solar system.
http://www.sciencekids.co.nz/sciencefacts/planets/neptune.html
Neptune - Fact Monster

Neptune, named for an ancient Roman sea god, is a stormy blue planet about 30 times farther from the Sun than Earth.
http://www.factmonster.com/science/astronomy/planet-neptune.html
Planets For Kids - Neptune

The discovery of the planet Neptune was one of the most exciting discoveries in astronomy.
http://www.planetsforkids.org/planet-neptune.html
Kids Astronomy - Neptune

At first, Neptune was only the god of water, but later on this was extended to include the sea when he became associated with the Greek god Poseidon.
http://www.kidsastronomy.com/neptune.htm
All About Neptune - NASA Space Place

Neptune is dark, cold, and very windy. It's the last of the planets in our solar system. It's more than 30 times as far from the sun as Earth is. Neptune is very similar to Uranus. It's made of a thick soup of water, ammonia, and methane over an Earth-sized solid center. Its atmosphere is made of hydrogen, helium, and methane. The methane gives Neptune the same blue color as Uranus. Neptune has six rings, but they're very hard to see.
http://spaceplace.nasa.gov/all-about-neptune/en/
Neptune Facts: Planets

Neptune is the eighth planet from the Sun and last of the known planets. While it is the third largest planet with respect to mass, it is only the fourth largest in terms of diameter. Due to its blue coloration, Neptune was named after the Roman god of the Sea.
http://theplanets.org/neptune/
The Gas (and Ice) Giant Neptune - Universe Today

Neptune is the eight planet from our Sun, one of the four gas giants, and one of the four outer planets in our Solar System.
http://www.universetoday.com/21581/neptune/
Neptune Facts: Interesting Facts about the Planet Neptune - Space Facts

Neptune is the eighth planet from the Sun making it the most distant in the solar system. This gas giant planet may have formed much closer to the Sun in early solar system history before migrating to its present position.
http://space-facts.com/neptune
Planet Neptune: Facts About Its Orbit, Moons and Rings

Neptune is the farthest planet from the sun and was the first to be predicted before it was discovered.
http://www.space.com/41-neptune-the-other-blue-planet-in-our-solar-system.html
Neptune Information, Facts, News, Photos - National Geographic

Get information, facts, photos, news, videos, and more about planet Neptune from National Geographic.
http://science.nationalgeographic.com/science/space/solar-system/neptune-article
Neptune - Views of the Solar System

Neptune is the outermost planet of the gas giants. It has an equatorial diameter of 49500 km. If Neptune were hollow, it could contain nearly 60 Earths. Neptune orbits the Sun every 165 years.
http://solarviews.com/eng/neptune.htm
Solar System Exploration: Neptune

Dark, cold and whipped by supersonic winds, Neptune is the last of the hydrogen and helium gas giants in our solar system. More than 30 times as far from the sun as Earth, the planet takes almost 165 Earth years to orbit our sun. In 2011 Neptune completed its first orbit since its discovery in 1846. "We see (Neptune) as Columbus saw America from the coast of Spain.
http://solarsystem.nasa.gov/planets/neptune/indepth
Neptune - Wikipedia

Neptune is the eighth and farthest planet from the Sun in the Solar System. It is the fourth-largest planet by diameter and the third-largest by mass.
https://en.wikipedia.org/wiki/Neptune
Neptune: Educational Facts and History of the Planet Neptune

In Roman mythology Neptune (Greek: Poseidon) was the god of the Sea. After the discovery of Uranus, it was noticed that its orbit was not as it should be in accordance with Newton's laws.
http://nineplanets.org/neptune.html

Comments

Neptune

Neptune in true colour; ^[1] at centre is the Great Dark Spot ^[a]

Discovery^[2]

Discovered by

Discovery date

23 September 1846

Designations

Pronunciation

US: /ˈnɛptuːn/ , UK: /-tjuːn/^[3]

Named after

Latin Neptunus, via French Neptune

Adjectives

Neptunian (/nɛpˈtjuːniən/),^[4] Poseidean^[5]

Symbol

Orbital characteristics^[6]^[b]

Epoch J2000

Aphelion

30.33 AU (4.54 billion km)

Perihelion

29.81 AU (4.46 billion km)

Semi-major axis

30.07 AU (4.50 billion km)

Eccentricity

0.008678

Orbital period (sidereal)

164.8 yr
60,195 days
89,666 Neptunian solar days^[7]

Orbital period (synodic)

367.49 days^[8]

Average orbital speed

5.43 km/s^[8]

Mean anomaly

259.883°

Inclination

1.770° to ecliptic
6.43° to Sun's equator
0.74° to invariable plane^[9]

Longitude of ascending node

131.783°

Time of perihelion

2042-Sep-04^[10]

Argument of perihelion

273.187°

Known satellites

Physical characteristics

Mean radius

24,622±19 km^[11]^[c]

Equatorial radius

24,764±15 km^[11]^[c]
3.883 Earths

Polar radius

24,341±30 km^[11]^[c]
3.829 Earths

Flattening

0.0171±0.0013

Surface area

7.6183×10⁹ km²^[12]^[c]
14.94 Earths

Volume

6.253×10¹³ km³^[8]^[c]
57.74 Earths

Mass

1.02409×10²⁶ kg^[8]
17.147 Earths
5.15×10⁻⁵ Suns

Mean density

1.638 g/cm³^[8]^[d]

Surface gravity

11.15 m/s² (1.137 g₀)^[8]^[c]

Moment of inertia factor

0.23^[13] (estimate)

Escape velocity

23.5 km/s^[8]^[c]

Synodic rotation period

0.67125 d
16 h 6 m 36 s^[7]

Sidereal rotation period

0.6713 day^[8]
16 h 6 min 36 s

Equatorial rotation velocity

2.68 km/s^[14]

Axial tilt

28.32° (to orbit)^[8]

North pole right ascension

19^h 57^m 20^s^[11]
299.36°^[15]

North pole declination

43.46°^[15]

Albedo

0.290 (bond)^[16]
0.442 (geom.)^[17]

Surface temp.	min	mean	max
1 bar level		72 K (−201 °C)^[8]
0.1 bar (10 kPa)		55 K (−218 °C)^[8]

Apparent magnitude

7.67^[18] to 8.00^[18]

Absolute magnitude (H)

−6.9^[19]

Angular diameter

2.2–2.4″^[8]^[20]

Atmosphere^[8]

Scale height

19.7±0.6 km

Composition by volume

80%±3.2% hydrogen
19%±3.2% helium
1.5%±0.5% methane
~0.019% hydrogen deuteride
~0.00015% ethane
Icy volatiles:

Source : Wikipedia under CC-BY-SA license

Links
Media

Space School Neptune - Youtube

Learn about the planet Neptune on YouTube.
https://www.youtube.com/watch?v=EmUvTH7sveg
Neptune Facts for Kids - Science Kids

Neptune is a large planet that experiences extreme atmospheric weather conditions. After the demotion of Pluto, it now holds the distinction of being further away from the sun than any other planet in our solar system.
http://www.sciencekids.co.nz/sciencefacts/planets/neptune.html
Neptune - Fact Monster

Neptune, named for an ancient Roman sea god, is a stormy blue planet about 30 times farther from the Sun than Earth.
http://www.factmonster.com/science/astronomy/planet-neptune.html
Planets For Kids - Neptune

The discovery of the planet Neptune was one of the most exciting discoveries in astronomy.
http://www.planetsforkids.org/planet-neptune.html
Kids Astronomy - Neptune

At first, Neptune was only the god of water, but later on this was extended to include the sea when he became associated with the Greek god Poseidon.
http://www.kidsastronomy.com/neptune.htm
All About Neptune - NASA Space Place

Neptune is dark, cold, and very windy. It's the last of the planets in our solar system. It's more than 30 times as far from the sun as Earth is. Neptune is very similar to Uranus. It's made of a thick soup of water, ammonia, and methane over an Earth-sized solid center. Its atmosphere is made of hydrogen, helium, and methane. The methane gives Neptune the same blue color as Uranus. Neptune has six rings, but they're very hard to see.
http://spaceplace.nasa.gov/all-about-neptune/en/
Neptune Facts: Planets

Neptune is the eighth planet from the Sun and last of the known planets. While it is the third largest planet with respect to mass, it is only the fourth largest in terms of diameter. Due to its blue coloration, Neptune was named after the Roman god of the Sea.
http://theplanets.org/neptune/
The Gas (and Ice) Giant Neptune - Universe Today

Neptune is the eight planet from our Sun, one of the four gas giants, and one of the four outer planets in our Solar System.
http://www.universetoday.com/21581/neptune/
Neptune Facts: Interesting Facts about the Planet Neptune - Space Facts

Neptune is the eighth planet from the Sun making it the most distant in the solar system. This gas giant planet may have formed much closer to the Sun in early solar system history before migrating to its present position.
http://space-facts.com/neptune
Planet Neptune: Facts About Its Orbit, Moons and Rings

Neptune is the farthest planet from the sun and was the first to be predicted before it was discovered.
http://www.space.com/41-neptune-the-other-blue-planet-in-our-solar-system.html
Neptune Information, Facts, News, Photos - National Geographic

Get information, facts, photos, news, videos, and more about planet Neptune from National Geographic.
http://science.nationalgeographic.com/science/space/solar-system/neptune-article
Neptune - Views of the Solar System

Neptune is the outermost planet of the gas giants. It has an equatorial diameter of 49500 km. If Neptune were hollow, it could contain nearly 60 Earths. Neptune orbits the Sun every 165 years.
http://solarviews.com/eng/neptune.htm
Solar System Exploration: Neptune

Dark, cold and whipped by supersonic winds, Neptune is the last of the hydrogen and helium gas giants in our solar system. More than 30 times as far from the sun as Earth, the planet takes almost 165 Earth years to orbit our sun. In 2011 Neptune completed its first orbit since its discovery in 1846. "We see (Neptune) as Columbus saw America from the coast of Spain.
http://solarsystem.nasa.gov/planets/neptune/indepth
Neptune - Wikipedia

Neptune is the eighth and farthest planet from the Sun in the Solar System. It is the fourth-largest planet by diameter and the third-largest by mass.
https://en.wikipedia.org/wiki/Neptune
Neptune: Educational Facts and History of the Planet Neptune

In Roman mythology Neptune (Greek: Poseidon) was the god of the Sea. After the discovery of Uranus, it was noticed that its orbit was not as it should be in accordance with Newton's laws.
http://nineplanets.org/neptune.html