Marsic or Kappa Herculis is an optical double, a pair of stars that appear close together in the sky, but are actually separated from one another by some considerable distance. Of the two, the yellowgiant Kappa Herculis A is the closer to Earth, while orange Kappa Herculis B lies some twenty light years farther away. A third faint star in this region is designated Kappa Herculis C, and this seems to be in orbit around the giant Kappa Herculis A.
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