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Naiad / ˈ n eɪ ə d /, (also known as Neptune III and previously designated as S/1989 N 6) named after the naiads of Greek legend, [10] is the innermost satellite of Neptune and the nearest to the center of any gas giant with moons with a distance of 48,224 km from the planet's center. Its orbital period is less than a Neptunian day ...
35 days (high latitude) 25 d 9 h 7 m 11.6 s 35 d ~28 days (equatorial) [2] Mercury: 58.6462 days [3] 58 d 15 h 30 m 30 s: 176 days [4] Venus: −243.0226 days [ii] [5] −243 d 0 h 33 m: −116.75 days [6] Earth: 0.99726968 days [3] [iii] 0 d 23 h 56 m 4.0910 s: 1.00 days (24 h 00 m 00 s) Moon: 27.321661 days [7] (equal to sidereal orbital ...
Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune. [a] Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units (4.50 × 10 9 km).
Neptune's mass of 1.0243 × 10 26 kg [8] is intermediate between Earth and the larger gas giants: it is 17 times that of Earth but just 1/19th that of Jupiter. [g] Its gravity at 1 bar is 11.15 m/s 2, 1.14 times the surface gravity of Earth, [71] and surpassed only by Jupiter. [72] Neptune's equatorial radius of 24,764 km [11] is nearly four ...
Proteus is the second-largest moon of Neptune and is the largest of its regular prograde moons. It is about 420 km (260 mi) in diameter, larger than Nereid, Neptune's third-largest moon. It was not discovered by Earth-based telescopes because Proteus orbits so close to Neptune that it is lost in the glare of reflected sunlight. [15]
98 airports have paved runways from 4 km to 5.5 km in length. 8 km – length of Palm Jebel Ali, an artificial island built off the coast of Dubai; 9.8 km – length of The World, an artificial archipelago that is also built off the coast of Dubai, whose islands resemble a world map
Hippocamp completes one revolution around Neptune every 22 hours and 48 minutes (0.95 days), corresponding to a semi-major axis, or orbital distance of 105,283 km (65,420 mi). [5] For comparison, this distance is approximately 4.3 Neptune radii, or just over a quarter of the Earth – Moon distance.
Voyager 2 's observation phase proper of Neptune began 5 June 1989, the spacecraft officially reached the Neptunian system on 25 August, and data collection ceased on 2 October. [4] Initially it was planned to use a trajectory that resulted in Voyager 2 passing around 1,300 km (810 mi) from Neptune and 8,200 km (5,100 mi) from Triton. [5]