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The average distance between Neptune and the Sun is 4.5 billion km (about 30.1 astronomical units (AU), the mean distance from the Earth to the Sun), and it completes an orbit on average every 164.79 years, subject to a variability of around ±0.1 years. The perihelion distance is 29.81 AU, and the aphelion distance is 30.33 AU.
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).
In astrodynamics, canonical units are defined in terms of some important object’s orbit that serves as a reference. In this system, a reference mass, for example the Sun’s, is designated as 1 “canonical mass unit” and the mean distance from the orbiting object to the reference object is considered the “canonical distance unit”.
Halley's Comet on an eccentric orbit that reaches beyond Neptune will be moving 54.6 km/s when 0.586 AU (87,700 thousand km) from the Sun, 41.5 km/s when 1 AU from the Sun (passing Earth's orbit), and roughly 1 km/s at aphelion 35 AU (5.2 billion km) from the Sun. [7] Objects passing Earth's orbit going faster than 42.1 km/s have achieved ...
Average distance from the Sun — Uranus: 19.2 — Average distance from the Sun — Kuiper belt: 30 — Inner edge begins at approximately 30 au [59] Neptune: 30.1 — Average distance from the Sun — Eris: 67.8 — Average distance from the Sun — Voyager 2: 137 — Distance from the Sun in October 2024 [60] Voyager 1: 165 — Distance from ...
The formula suggests that, extending outward, each planet should be approximately twice as far from the Sun as the one before. The hypothesis correctly anticipated the orbits of Ceres (in the asteroid belt) and Uranus, but failed as a predictor of Neptune's orbit. It is named after Johann Daniel Titius and Johann Elert Bode.
170 km/h (110 mph) Titan: 0.138 1.3455 4.414 12.2 s: 59 km/h (37 mph) Uranus: 0.917 9.01 29.6 4.7 s: 153 km/h (95 mph) Titania: 0.039 0.379 1.24 23.0 s: 31 km/h (19 mph) Oberon: 0.035 0.347 1.14 24.0 s: 30 km/h (19 mph) Neptune: 1.148 11.28 37.0 4.2 s: 171 km/h (106 mph) Triton: 0.079 0.779 2.56 16.0 s: 45 km/h (28 mph) Pluto: 0.0621 0.610 2.00 ...
Evolution of the solar luminosity, radius and effective temperature compared to the present-day Sun. After Ribas (2009) [3] The uncrewed SOHO spacecraft was used to measure the radius of the Sun by timing transits of Mercury across the surface during 2003 and 2006. The result was a measured radius of 696,342 ± 65 kilometres (432,687 ± 40 miles).