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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 ...
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 VIII: 210 ± 7: 44: ≈ 1.3: moon of Neptune ... This list contains a selection of objects 50 and 99 km in radius (100 km to 199 km in average diameter).
It orbits Neptune at a distance of about 23,571,000 km and is about 42 kilometers in diameter (assuming albedo of 0.04). [5] It is named after Laomedeia , one of the 50 Nereids . References
Ground observations of Varuna's thermal emission from 2000 to 2005 yielded large diameter estimates ranging from 900 km (560 mi) to 1,060 km (660 mi), making it comparable to the size of Ceres. [43] Contrary to the ground-based estimates, space-based thermal observations from the Spitzer Space Telescope provided a smaller diameter range of 450 ...
Psamathe is about 38 kilometers in diameter. It orbits Neptune at a distance of between 25.7 and 67.7 million km (for comparison, the Sun- Mercury distance varies between 46 million and 69.8 million km) and requires almost 25 Earth years to make one orbit.
The surface of Proteus is heavily cratered and shows a number of linear features. Its largest crater, Pharos, is more than 150 km in diameter. [6] [23] All of Neptune's inner moons are dark objects: their geometric albedo ranges from 7 to 10%. [25]
S/2021 N 1 is the smallest, faintest, and most distant natural satellite of Neptune known, with a diameter of around 16–25 km (10–16 mi). It was discovered on 7 September 2021 by Scott S. Sheppard, David J. Tholen, Chad Trujillo, and Patryk S. Lykawka using the 8.2-meter Subaru Telescope at Mauna Kea, Hawaii, and later announced on 23 February 2024. [1]