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In page Alpha Herculis:
"Alpha Herculis A and B are more than 500 AU apart, with an estimated orbital period of approximately 3600 years.[citation needed] A presents as a relatively massive red bright giant, but radial velocity measurements suggest a companion with a period of the order of a decade.[2] B's two components are a primary yellow giant star and a secondary, yellow-white dwarf star in a 51.578 day orbit.[3]
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