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Neptune's equatorial radius of 24,764 km [11] is nearly four times that of Earth. Neptune, like Uranus , is an ice giant , a subclass of giant planet , because they are smaller and have higher concentrations of volatiles than Jupiter and Saturn. [ 73 ]
This list contains a selection of objects 50 and 99 km in radius (100 km to 199 km in average diameter). The listed objects currently include most objects in the asteroid belt and moons of the giant planets in this size range, but many newly discovered objects in the outer Solar System are missing, such as those included in the following ...
Proteus orbits Neptune at a distance of approximately 117,647 km (73,102 mi), nearly equal to 4.75 times the equatorial radius of the planet. The orbit of Proteus is nearly circular, having a small orbital eccentricity, and is inclined by about 0.5 degrees to Neptune's equator. [3]
He obtained a value of 3,800 km. Subsequent measurement attempts arrived at values ranging from 2,500 to 6,000 km, or from slightly smaller than the Moon (3,474.2 km) to nearly half the diameter of Earth. [81] Data from the approach of Voyager 2 to Neptune on August 25, 1989, led to a more accurate estimate of Triton's diameter (2,706 km). [82]
Neptune: 6.836 529 (9) × 10 15: Pluto: 8.71(9) × 10 11 [10] ... the unit km 3 ⋅s −2 is ... where r is the radius of the gravitating body, L is the length of the ...
Solar radius is a unit of distance used to express the ... ) to be equal to exactly 695 700 km. [5] The nominal value, which ... Neptune: 0.03559 24,764 [18 ...
The smallest natural satellite that is gravitationally rounded is Saturn I Mimas (radius 198.2 ± 0.4 km). This is smaller than the largest natural satellite that is known not to be gravitationally rounded, Neptune VIII Proteus (radius 210 ± 7 km).
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).