Upsilon Librae
Template:Short description Template:Starbox begin Template:Starbox image Template:Starbox observe Template:Starbox character Template:Starbox astrometry Template:Starbox detail Template:Starbox catalog Template:Starbox reference Template:Starbox end Upsilon Librae (υ Lib, υ Librae) is the Bayer designation for a double star[1] in the zodiac constellation Libra. With an apparent visual magnitude of 3.628,[2] it is visible to the naked eye. The distance to this star, based upon an annual parallax shift of 14.58,[3] is around 224 light years. It has a magnitude 10.8 companion at an angular separation of 2.0 arc seconds along a position angle of 151°, as of 2002.[4]
The brighter component is an evolved K-type giant star with a stellar classification of K3 III.[5] The measured angular diameter, after correction for limb darkening, is Template:Val.[6] At the estimated distance of the star, this yields a physical size of about 31.5 times the radius of the Sun.[7] It has 1.67 times the mass of the Sun and radiates 309 times the solar luminosity from its outer atmosphere at an effective temperature of 4,135 K.[8] The star is about three billion years old.[8]
Upsilon Librae will be the brightest star in the night sky in about 2.3 million years,[9] and will peak in brightness with an apparent magnitude of −0.46, or more than 40 times its present-day brightness.[9]
This star was originally designated by Bayer as Omicron Scorpii, but it was reassigned to Libra as Upsilon Librae.[10]Template:Rp The star now known as Omicron Scorpii was a reinterpretation of o (Latin letter o) Scorpii, a designation given by Lacaille.
References
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