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Proper NameNone
Bayer DesignationTheta Coronae Borealis
Flamsteed Number4 Coronae Borealis
HR (BSC)5778
ConstellationCorona Borealis
Right Ascension15h 32m 56s
Declination+31° 21' 33"
Distance375 light years
115 parsecs
MagnitudeApparent: +4.2
Absolute: -0.7
Spectral ClassB6 Blue Dwarf
Optimum VisibilityMay / June
NotesA binary system whose primary star is a blue dwarf surrounded by a disc of matter; its companion is a white star of less than half the mass of the primary.

A binary system: the primary star is a blue dwarf with a surface temperature considerably greater than that of the Sun. Theta Coronae Borealis is more than three hundred light years from Earth's Solar System.


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