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Botein

Delta Arietis, 57 Arietis

Proper NameBotein
Bayer DesignationDelta Arietis
Flamsteed Number57 Arietis
HR (BSC)951
HD19787
ConstellationAries
Right Ascension3h 12m 46s
Declination+19° 48' 4"
Distance170 light years
52 parsecs
MagnitudeApparent: +4.3
Absolute: +0.8
Spectral ClassG9.5IIIb Yellow Giant
Optimum VisibilityNovember
NotesBotein is a giant star at a late stage of its evolution; having consumed its reserves of hydrogen, the fusion in its core is now driven by helium. The star has swelled to a diameter more than ten times that of the Sun. Botein appears to be a variable star, though the processes driving its variability are not currently understood in detail.

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