Neptune’s rotation period was established when Voyager 2 detected radio bursts associated with the planet’s magnetic field and having a period of 16.11 hours. As on Earth, the axial tilt gives rise to seasons on Neptune, and, because of the circularity of Neptune’s orbit, the seasons (and the seasons of its moons) are of nearly equal length, each nearly 41 years in duration. Neptune’s rotation axis is tipped toward its orbital plane by 29.6°, somewhat larger than Earth’s 23.4°.
Its orbital eccentricity of 0.0086 is the second lowest of the planets only Venus’s orbit is more circular.
Voyager 2’s encounter with Neptune resulted in a small upward revision of the planet’s estimated mean distance from the Sun, which is now thought to be 4,498,250,000 km (2,795,083,000 miles). Consequently, astronomers expect to be making refinements in calculating its orbital size and shape well into the 21st century. Having an orbital period of 164.79 years, Neptune has circled the Sun only once since its discovery in September 1846. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.
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