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Glossary term: Unidade astronômica

Description: Uma unidade astronômica (UA) é uma unidade de distância conveniente igual a exatamente 149.597.870,7 quilômetros (km). Essa é aproximadamente a distância média entre a Terra e o Sol, que era uma definição anterior da UA. A UA é frequentemente usada para medir distâncias no Sistema Solar e em outros sistemas planetários ou estelares. Por exemplo, Netuno orbita a cerca de 30 UA do Sol

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

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Related Diagrams


Concentric circles for the orbits of Mercury, Venus, Earth and Mars. The Earth to Sun distance is marked as IAU

Astronomical Unit

Caption: An astronomical unit (AU) is a convenient unit of distance equal to exactly 149,597,870.7 kilometers (km). This is approximately the average distance between the Earth and the Sun, which was a previous definition of the AU. The AU is often used to measure distances in the Solar System and in other planetary or stellar systems.
Credit: Danielle Futselaar/IAU OAE

License: CC-BY-4.0 Creative Commons Attribution 4.0 International (CC BY 4.0) icons

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