Magnitude 5.34 Apparent magnitude (V) 5.34 | ||
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Rho Aquarii (ρ Aqr, ρ Aquarii) is the Bayer designation for a binary star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of +5.34. Based upon parallax measurements made during the Hipparcos mission, this star is at a distance of roughly 880 light-years (270 parsecs) from Earth.
This is a single-lined spectroscopic binary, with the presence of a companion being revealed by Doppler shifts in the spectrum. The primary is a giant star with a stellar classification of B8 IIIp Mn:Hg:. It is a Mercury-Manganese star, showing a surfeit of these elements in the spectrum. With five times the Sun's mass, this star is radiating 1,035 times as much luminosity from its outer atmosphere at an effective temperature of 12,593 K. This heat gives it the blue-white hue of a B-type star. The companion may be a variable star.