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Alphekka, Gemma, Alpha Coronae Borealis, 5 Coronae Borealis

Proper NamesAlphecca, Alphekka, Gemma
Bayer DesignationAlpha Coronae Borealis
Flamsteed Number5 Coronae Borealis
HR (BSC)5793
ConstellationCorona Borealis
Right Ascension15h 34m 41s
Declination+26° 42' 53"
Distance75 light years
23 parsecs
MagnitudeApparent: +2.2
Absolute: -0.4
Spectral ClassA0V white main sequence star
Optimum VisibilityMay / June
NotesAlphecca is a binary system. The main white star is orbited by a yellow dwarf, which causes its magnitude to increase slightly over a period of a little more than seventeen days. Beyond the dwarf companion, a wide disc of material extends far out into space, reaching some 60 AU from the primary star.

Imagery provided by Aladin sky atlas

Location of Alphecca

The jewel in the Crown: the location of Alphecca, brightest of the stars of Corona Borealis, the Northern Crown.

A variable white star some seventy-five light years from Earth, the brightest in the northern constellation of Corona Borealis.


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