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Nusakan

Beta Coronae Borealis, 3 Coronae Borealis

Bright yellow dwarf in Corona Borealis

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Proper Name	Nusakan
Bayer Designation	Beta Coronae Borealis
Flamsteed Number	3 Coronae Borealis
HR (BSC)	5747
HD	137909
Constellation	Corona Borealis
Right Ascension	15h 27m 50s
Declination	+29° 6' 21"
Distance	117 light years 36 parsecs
Magnitude	Apparent: +3.66 Absolute: 0.89
Spectral Class	F2VpSrCrEuSi bright yellow dwarf
Optimum Visibility	May / June
Notes	Nusakan is a binary system, with two hot main sequence stars orbiting one another over a period of more than ten years. The more massive and luminous of the two components, Beta Coronae Borealis A, is chemically peculiar star that shows variability of the Alpha² Canum Venaticorum type, causing its brightness to change as it rotates rapidly on its axis.

Nusakan is the westernmost of the stars of the Northern Crown, a yellow-white star with a close binary companion. It is characterised by an irregular distribution of heavier elements, causing its brightness to fluctuate.

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