Zeta Ophiuchi

O-type main sequence star in the constellation Ophiuchus

Zeta Ophiuchi (ζ Oph, ζ Ophiuchi) is a single star located in the constellation of Ophiuchus. It has an apparent visual magnitude of 2.6, making it the third-brightest star in the constellation. Spectroscopic measurements give an estimated distance of roughly 440 light-years (135 parsecs) from the Earth.

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