![]() Rho Ophiuchi AB is a visual binary, and the sky-projected distance between the two stars appears to be 3.1″, corresponding to a separation of at least 344 astronomical units (au). It consists of at least two blue-colored subgiants or main-sequence stars, designated Rho Ophiuchi A and B, respectively. The central pair is known as Rho Ophiuchi AB. Rho Ophiuchi is the small group of stars in the blue nebulosity (IC 4604). System Rho Ophiuchi cloud complex (N is up): Antares is the bright star that looks yellow in this image, σ Scorpii is in the red nebula ( Sh2-9), and the globular cluster M4 is in between. The other stars in the system are slightly farther away. Based on the central system's parallax of 9.03 mas, it is located about 360 light-years (110 parsecs) away. The central system has an apparent magnitude of 4.63. Rho Ophiuchi (ρ Ophiuchi) is a multiple star system in the constellation Ophiuchus. ![]()
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