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Proper Name	None
Bayer Designation	Zeta Herculis
Flamsteed Number	40 Herculis
HR (BSC)	6212
HD	150680
Constellation	Hercules
Right Ascension	16h 41m 17s
Declination	+31° 36' 10"
Distance	35 light years 11 parsecs
Magnitude	Apparent: +2.8 Absolute: +2.7
Spectral Class	G0IV yellow subgiant
Optimum Visibility	June
Notes	Zeta 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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