13 Facts About Arcturus


Arcturus is the brightest star in the northern constellation of Bootes.

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Name Arcturus is Latinised from the Greek star name ???t????? meaning "the Guard".

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Arcturus has been seen at or just before sunset with the naked eye.

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Arcturus is visible from both of Earth's hemispheres as it is located 19° north of the celestial equator.

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Arcturus is moving rapidly relative to the Sun, and is almost at its closest point to the Sun.

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Arcturus is an evolved red giant star with an early K-type stellar classification.

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The atmosphere of Arcturus has an enrichment of alpha elements relative to iron but only about a third of solar metallicity.

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Hipparcos satellite astrometry suggested that Arcturus is a binary star, with the companion about twenty times dimmer than the primary and orbiting close enough to be at the very limits of humans' current ability to make it out.

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Aratus in his Phaenomena said that the star Arcturus lay below the belt of Arctophylax, and according to Ptolemy in the Almagest it lay between his thighs.

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Arcturus is specified as ?????? ?????? as-simak ar-ramih "the uplifted one of the lancer".

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In Indian astronomy, Arcturus is called Swati or Svati, possibly 'su' + 'ati' meaning very beneficent.

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Arcturus had several other names that described its significance to indigenous Polynesians.

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Arcturus's light was employed in the mechanism used to open the 1933 Chicago World's Fair.

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