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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).
A size comparison of Neptune and Earth. Neptune's mass of 1.0243 ... The average distance between Neptune and the Sun is 4.5 billion km (about 30.1 ...
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(613490) 2006 RJ 103 is a Neptune trojan, first observed by the Sloan Digital Sky Survey Collaboration at Apache Point Observatory, New Mexico, on 12 September 2006. [2] It was the fifth and largest such body discovered, approximately 180 kilometers in diameter. As of 2016, it is 30.3 AU from Neptune.
2008 LC 18 is a Neptune trojan first observed on 7 June 2008 by American astronomers Scott Sheppard and Chad Trujillo using the Subaru Telescope at Mauna Kea Observatories on Hawaii, United States. [6] It was the first object found in Neptune's trailing L 5 Lagrangian point and measures approximately 100 kilometers in diameter. [5]
340 km – diameter of Nereid, the third-largest moon of Neptune which has a highly elliptical orbit; 350 km – lower bound of Low Earth orbit; 420 km – diameter of Proteus, the second-largest moon of Neptune; 468 km – diameter of the asteroid 4 Vesta; 472 km – diameter of Miranda, one of Uranus's major moons
The Great Dark Spot was captured by NASA's Voyager 2 space probe in Neptune's southern hemisphere. The dark, elliptically shaped spot (with initial dimensions of 13,000 × 6,600 km, or 8,100 × 4,100 mi), was about the same size as Earth, and was similar in general appearance to Jupiter's Great Red Spot.
Based on a generic magnitude-to-diameter conversion, it measures approximately 71 kilometers in diameter using an absolute magnitude of 8.9 and an assumed albedo of 0.10. [5] It is one of the smaller bodies among the first 17 Neptune trojans discovered so far, which measure between 60 and 200 kilometers (for an absolute magnitude of 9.3–6.6 ...