Neptune | | | | | |
|  Automatic translation | | | | | | The planet Neptune | | | | category : planets |  | | | | | This photograph of Neptune was reconstructed from two images taken by the traveler through the 2 narrow-angle camera.
The image shows three functions that the traveler 2 photographed during her fly around Neptune. In the center, we see the Great Dark Spot, accompanied by bright clouds, white undergoing rapid changes in appearance.
South of the great dark spot shows another bright spot that scientists have dubbed "the Scooter".
More farther south, a smaller spot is called "Dark Spot 2," at the heart shine.
Each object of the atmosphere of Neptune is moving eastward at a different speed, so it is difficult to see them close to each other. Only rarely they appear close to each other.
2 The passenger is the only spacecraft that has visited the planet Neptune.
"A planet is a celestial body that is in orbit around the Sun, which has sufficient mass for its gravity overcomes the forces of cohesion of solid body and maintain hydrostatic equilibrium (spherical), which eliminated any body moving in an orbit close."
This definition was approved on 24 August 2006 at the 26th General Assembly of the IAU (International Astronomical Union) by a show of hands of about 400 scientists and astronomers after ten days of discussions. | |  * photograph sent by traveler 2, this stunning image of storms in the windy atmosphere of Neptune was taken on 24 August 1989.
Image credit: NASA.
| | | Neptune | | |
|---|
| masse | | 1,0243 x1026 | | gravity | | 11,15 m/s2 | | rayon equatorial | | 24 961 km | | rayon polar | | 24 287 km | | semi-major axis | | 4,498 253x109 km | | aphelion | | 4 526 874 325 km | | perihelion | | 4 459 631 496 km | | circumference orbital | | 28,142x109 km | | average albedo | | 0,41 | | eccentricity | | 0,00858587 | | period de revolution | | 60 224,9036 days | | average orbital speed | | 5,4317 km/s | | inclination | | 1,76917° | | number of known satellites | | 13 | | liberation speed | | 23,5 km/s | | average temperature | | -220°C (53 K) |
nota : Neptune represents 3% of the total mass of the planets of the solar system.
| | | | | | | | Neptune: Poseidon in Greek | | | | | | | | | | Neptune (Poseidon in Greek sea god) is the eighth and last planet in our solar system and appears with powerful instruments. It is 4,526 874 325 billion km from the Sun (30 times farther than Earth).
The French astronomer Urbain Le Verrier calculated the hypothetical position in the sky, the eighth planet, which was called Neptune.
It was discovered in 1846 at the predicted position. Neptune was not discovered by observation, but with pencil and paper from the trajectory and characteristics of Uranus.
Neptune, like all the Jovian planets have rings discovered from 1984, but their existence has been confirmed by Voyager 2 in 1989, 3 key rings very narrow and dark orbit around the planet.
The blue color of Neptune is the result of absorption of red light by methane in its atmosphere.
The atmosphere of Neptune has a thickness of more than 8 000 km. It is composed primarily of hydrogen (H2) for 85%, helium (He) for 13% and methane (CH4) to 2%.
In the 1960s, in the outer solar system, it was spring in the southern hemisphere of Neptune. | | As Neptune goes around around the Sun every 165 years, ie 41.5 years last season, now it's summer for southern Neptune.
Astronomers have found that in recent years Neptune has been particularly brilliant, as shown in this beautiful image of the Hubble Space Telescope in 2002.
Compared to the pictures taken by Hubble, in 1996, the 2002 image shows a large increase in reflective white cloud bands in Neptune's southern hemisphere.
The Neptune's equator is tilted 29.58 degrees to the plane of its orbit, much like on Earth (23.5 °).
The weather on Neptune seems to be changing dramatically with the seasons, despite the low intensity of light that reaches the sun. It is 900 times less intense than on Earth.
Since 2005 and for 40 years, it's summer in the southern hemisphere of Neptune.* Since 2005, it is summer in the southern hemisphere of Neptune and another 4 decades. | | 
| | | | | | | | The 13 moons of Neptune | | | | | | | | | | Neptune (Greek Poseidon, god of the sea) is the 8th and final planet in the solar system and might prove as powerful instruments.
It is 4 526 874 325 km of the Sun (30 times farther than Earth).
The French astronomer Urbain Le Verrier calculated the hypothetical position in the sky, the eighth planet, known as Neptune.
It was discovered in 1846 in the position predicted.
Neptune was not discovered by the observation, but with pencil and paper from the trajectory and characteristics of Uranus.
Neptune planets like Jupiter have rings discovered in 1984, but their existence has been confirmed by Voyager 2 in 1989, 3 key rings and dark narrow orbit of this planet around.
The blue color of Neptune is the result of absorption of red light by methane in its atmosphere. | | | Satellite | distance | diameter | mass |
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| Triton | 354 800 | 2 706 | 2 140x1019 | | Proteus | 354 800 | 418 | 5000x1016 | | Nereid | 5 513 400 | 340 | 3100x1016 | | Larissa | 73 500 | 193 | 490x1016 | | Galatea | 62 000 | 176 | 370x1016 | | Despina | 52 500 | 150 | 210x1016 | | Thalassa | 50 100 | 82 | 37x1016 | | Naiad | 48 200 | 66 | 19x1016 | | S/2002 N4 | 48 387 000 | 60 | 9x1016 | | S/2002 N1 | 15 686 000 | 48 | 9x1016 | | S/2002 N2 | 19 345 000 | 48 | 9x1016 | | S/2002 N3 | 20 723 000 | 48 | 9x1016 | | Psamathea | 46 738 000 | 28 | 1,5x1016 |
* Triton is the seventh and the largest satellite of Neptune. Its orbit is retrograde (opposite direction of rotation than the rotation of Neptune). | | 
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* photograph sent by traveler 2, this stunning image of storms in the windy atmosphere of Neptune was taken on 24 August 1989. 
