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Proper NameNone
Bayer DesignationBeta Trianguli
Flamsteed Number4 Trianguli
HR (BSC)622
HD13161
ConstellationTriangulum
Right Ascension2h 9m 33s
Declination+34° 59' 14"
Distance127 light years
39 parsecs
MagnitudeApparent: +3.0
Absolute: +0.1
Spectral ClassA5IV White Subgiant
Optimum VisibilityNovember
NotesThough only third magnitude, Beta Trianguli is nonetheless the brightest star of Triangulum, appearing marginally brighter in the sky than the Alpha star, Mothallah. It is a spectroscopic binary, with a very close companion star orbiting at a distance of just 5 AU (comparable with the orbit of Jupiter around the Sun) over a period of some 31 days.

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