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Beta Andromedae, 43 Andromedae

Proper NameMirach
Bayer DesignationBeta Andromedae
Flamsteed Number43 Andromedae
HR (BSC)337
Right Ascension1h 9m 44s
Declination+35° 37' 14"
Distance197 light years
61 parsecs
MagnitudeApparent: +2.1
Absolute: -1.8
Spectral ClassM0IIIa red giant
Optimum VisibilityOctober
NotesMirach is an immense red giant, with a diameter approaching 0.8 AU, that emits thousands of time the energy of the Sun. It appears to be a semiregular variable star, and has at least one companion star in a distant orbit.

Andromeda's Beta star is a red giant almost exactly 200 light years from the Solar System. It lies in the central parts of the figure of Andromeda, hence its name: Mirach means 'girdle'.


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