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Sigma Andromedae

25 Andromedae

White main sequence star in Andromeda

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Proper Name	None
Bayer Designation	Sigma Andromedae
Flamsteed Number	25 Andromedae
HR (BSC)	68
HD	1404
Constellation	Andromeda
Right Ascension	0h 18m 20s
Declination	+36° 47' 7"
Distance	140 light years 43 parsecs
Magnitude	Apparent: +4.51 Absolute: +1.34
Spectral Class	A2V white main sequence star
Optimum Visibility	October

Imagery provided by Aladin sky atlas

One of an apparent triangle of stars that lies to the south and west of the Andromeda Galaxy in the sky (the other two in this group being Theta and Rho Andromedae). Sigma Andromedae is a pulsating white variable of the Delta Scuti classification, about 140 light years from the Solar System.

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