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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 ...
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.
Beta Librae (β Librae, abbreviated Beta Lib, β Lib), formally named Zubeneschamali / z uː ˌ b ɛ n ɛ ʃ ə ˈ m eɪ l i /, [10] [11] is (despite its 'beta' designation) the brightest star in the zodiac constellation of Libra. From parallax measurements, its distance can be estimated as 185 light-years (57 parsecs) from the Sun. [1]
σ Librae (Latinised to Sigma Librae) is the system's current Bayer designation (the star originally bore the designation Gamma Scorpii [16] and did not receive its current designation until the new designation was agreed upon by Commission 3 of the International Astronomical Union (IAU) on July 31, 1930. [17])
A light curve for Iota 1 Librae plotted from STEREO data, adpated from Wraight et al. (2012) [7]. Iota 1 Librae is a four star system. [3] The inner pair, designated components Aa and Ab, form a spectroscopic binary with an orbital period of 22.35 years and an eccentricity of 0.35. [5]
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ζ 2 Librae (abbreviated Zeta 2 Librae, Zeta 2 Lib, ζ 2 Lib), also known as 33 Librae, is a variable star in the constellation Libra. It is approximately 261 light-years away from the Sun. [2] Zeta 2 Librae does not have an HR number, although it is included in the Bright Star Catalogue Supplement. [3] [4]
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.