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Her A is about 113 parsecs (370 light-years) from the Sun and ? Her B is 600 parsecs (2,000 light-years); more recent parallax measurements suggest that B is around 5% more distant than A.

A faint third component Kappa Herculis C is just over 1 arc-minute away. It is at the same distance as ? Her A and has an almost-identical space motion.

The star 8 Herculis forms a naked eye

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