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The constellation Libra marked on a naked eye view. Overall, there are 83 stars within the constellation's borders brighter than or equal to apparent magnitude 6.5. [a] [2] The brightest stars in Libra form a quadrangle that distinguishes it for the unaided observer. Traditionally, Alpha and Beta Librae are considered to represent the scales ...
Moreover, the entire constellation of Libra was considered to be claws of Scorpius (Chelae Scorpionis) in Ancient Greek times, with a set of scales held aloft by Astraea (represented by adjacent Virgo) being formed from these westernmost stars during later Greek times. The division into Libra was formalised during Roman times. [citation needed]
α Librae (Latinised to Alpha Librae) is the system's Bayer designation.. Zubenelgenubi / ˌ z uː b ən ɛ l dʒ ə ˈ n uː b i /, also rendered Zuben Elgenubi, derives from the Arabic ّالزُبَانَى الجَنُوبِي al-zubānā al-janūbiyy "the southern claw", which was coined before Libra was recognized as a constellation distinct from Scorpius.
Gamma Librae (γ Librae, abbreviated Gamma Lib, γ Lib) is a suspected [8] binary star system in the constellation of Libra. It is visible to the naked eye, having an apparent visual magnitude of +3.91. [2] Based upon an annual parallax shift of 19.99 mas as seen from Earth, it lies 163 light years from the Sun.
An illustration from Urania's Mirror (1825) depicting the constellation Libra. This faint constellation, which has no first magnitude stars, is located between Virgo to the west and Scorpius to the east. Both Roman and Babylonian astronomy likened the constellation to a pair of scales, though the Ancient Greeks held it to be the scorpion's claws.
HD 140283 (also known as the Methuselah star) is a metal-poor subgiant star about 200 light years away from the Earth in the constellation Libra, near the boundary with Ophiuchus in the Milky Way Galaxy. Its apparent magnitude is 7.205, so it can be seen with binoculars. It is one of the oldest stars known.
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(Bayer might have called Altair "Beta Tympani Flumine" if he had been cataloguing Chinese constellations.) Some stars also have traditional names, often related to mythology or astrology. For example, Altair is more commonly known as 牛郎星 or 牵牛星 (the Star of the Cowherd) in Chinese, after the mythological story of the Cowherd and ...