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The following outline is provided as an overview of and topical guide to Neptune: . Neptune – eighth and farthest known planet from the Sun in the Solar System.In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.
South-up map orientation is the orientation of a map with south up, at the top of the map, amounting to a 180-degree rotation of the map from the standard convention of north-up. Maps in this orientation are sometimes called upside down maps or reversed maps .
Neptune brightened about 10% between 1980 and 2000 mostly due to the changing of the seasons. [177] Neptune may continue to brighten as it approaches perihelion in 2042. The apparent magnitude currently ranges from 7.67 to 7.89 with a mean of 7.78 and a standard deviation of 0.06. [18] Prior to 1980, the planet was as faint as magnitude 8.0. [18]
The Atlantic Neptune is a monumental four volume atlas which was the most important collection of maps, charts and views of North America published in the eighteenth century. [1] It was created by Colonel Joseph Frederick Wallet Des Barres .
The following outline is provided as an overview of and topical guide to North America. North America is a continent [ 1 ] in the Earth 's Northern and Western Hemispheres . It is bordered on the north by the Arctic Ocean , on the east by the North Atlantic Ocean , on the southeast by the Caribbean Sea , and on the south and west by the North ...
Triton orbits Neptune in a retrograde orbit—revolving in the opposite direction to the parent planet's rotation—the only large moon in the Solar System to do so. [ 3 ] [ 13 ] Triton is thought to have once been a dwarf planet from the Kuiper belt , captured into Neptune's orbit by the latter's gravity .
A celestial object's axial tilt indicates whether the object's rotation is prograde or retrograde. Axial tilt is the angle between an object's rotation axis and a line perpendicular to its orbital plane passing through the object's centre. An object with an axial tilt up to 90 degrees is rotating in the same direction as its primary.
The second would fly by Neptune in 2038 at a distance of 1,000 km and drop an atmospheric probe en route to the tail of the heliosphere. planned [14] Freya: ESA/NASA: orbiter Main focus would be to map the gravitational fields in deep space, including the Outer Solar System (up to 50 AU) proposed [15] [16] OSS ESA/NASA: flyby proposed [17 ...