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Delta Ophiuchi: Wikis


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Delta Ophiuchi (δ Oph / δ Ophiuchi) is a star in the constellation Ophiuchus. It has the traditional name Yed Prior (and the star Epsilon Ophiuchi, with which it forms a naked eye optical double, is Yed Posterior).

The traditional name Yed is derived from Arabic meaning "the hand", and the two stars are the left hand of Ophiuchus (the Serpent Bearer) that holds the head of the serpent Serpens Caput.

Delta Ophiuchi is 170 light years from Earth (while Epsilon is 108, hence they are a mere optical double). It is a red giant (class M), temperature 4850 K.

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