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Proper NameNone
Bayer DesignationZeta Herculis
Flamsteed Number40 Herculis
HR (BSC)6212
Right Ascension16h 41m 17s
Declination+31° 36' 10"
Distance35 light years
11 parsecs
MagnitudeApparent: +2.8
Absolute: +2.7
Spectral ClassG0IV yellow subgiant
Optimum VisibilityJune
NotesZeta Herculis is a binary system, in which the primary is a yellow subgiant in the late stages of its life. Its companion, Zeta Herculis B, is a yellow dwarf star similar to (though rather less luminous than) the Sun, pursuing a highly eccentric orbit around the subgiant Zeta Herculis A.


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