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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.
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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