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Brachium

Cornu, Zubenhakrabi, Sigma Librae, 20 Librae

Proper NamesBrachium, Cornu, Zubenhakrabi
Bayer DesignationSigma Librae
Flamsteed Number20 Librae
HR (BSC)5603
HD133216
ConstellationLibra
Right Ascension15h 4m 4s
Declination-25° 16' 55"
Distance288 light years
88 parsecs
MagnitudeApparent: +3.3
Absolute: -1.5
Spectral ClassM2.5III red giant
Optimum VisibilityMay
NotesThe primary star of this system is a variable red giant in the later stages of its life, showing complex patterns of variability that repeat over a period of twenty days. This giant primary has a distant and faint companion star, designated Sigma Librae B.

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