Lambda Librae
Binary star system in the constellation Libra
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λ Librae (Latinised as Lambda Librae) is the Bayer designation for a binary star system in the zodiac constellation of Libra. It can be faintly seen with the naked eye, having an apparent visual magnitude of 5.03.[2] With an annual parallax shift of 10.54 mas,[1] it is roughly 310 light years from the Sun. At that distance, the visual magnitude of this system is diminished by an extinction factor of 0.22 due to interstellar dust.[6] It is 0.1 degree north of the ecliptic.
This is a single-lined spectroscopic binary star system with an orbital period of 14.48 days and an eccentricity of 0.27.[7] The visible component is a B-type main sequence star with a stellar classification of B3 V.[3] It is a helium-weak chemically peculiar star[13] and a rotating ellipsoidal variable.[4] The star has an estimated 3.9[9] times the radius of the Sun and five times the Sun's mass.[8] This is a candidate Vega-like star, meaning that it shows an infrared excess characteristic of a circumstellar debris disk.[14] The system is a source of X-ray emission.[15]