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21 Canum Venaticorum

BK Canum Venaticorum

White Star in Canes Venatici

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Proper Name	None
Bayer Designation	None
Flamsteed Number	21 Canum Venaticorum
Variable Designation	BK Canum Venaticorum
HR (BSC)	5023
HD	115735
Constellation	Canes Venatici
Right Ascension	13h 18m 15s
Declination	+49° 40' 55"
Distance	279 light years 85 parsecs
Magnitude	Apparent: +5.2 Absolute: +0.5
Spectral Class	B9IV(Si) blue subgiant (uncertain, some sources prefer A0VSi: white main sequence star)
Optimum Visibility	April / May (Usually visible from northern latitudes)
Notes	21 Canum Venaticorum is a variable star of the Alpha² Canum Venaticorum type. Stars of this kind show variations in their brightness and their spectrum as they rotate (in this case over a period of some eighteen hours) due to variations on the surface of the star itself.

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