Rho Ophiuchi (ρ Ophiuchi) is a multiple star system in the constellation Ophiuchus. It consists of at least two blue subgiants, ρ Oph A and ρ Oph B, both of which are of class B. ρ Oph AB is a visual binary, and the sky-projected distance between ρ Oph A and ρ Oph B is 3.1" (or 344 AU at the 111 pc distance of ρ Oph AB).
Two to three other blue subgiants, ρ Oph C and ρ Oph DE, are found to be related to the star system, with sky-projected distances to ρ Oph AB of ~ 17,000 and ~ 19,000 AU, respectively. ρ Oph C and ρ Oph D are also of class B.
The apparent brightness of the star system has been dimmed by about 2 magnitudes, as a result of interstellar extinction, due to its location within the Ophiuchus cloud. The star system, ρ Oph AB, is located about 360 light years away.
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