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The largest star in the system, Gliese 667 A (GJ 667 A), is a K-type main-sequence star of stellar classification K3V. [2] It has about 73% [6] of the mass of the Sun and 76% [2] of the Sun's radius, but is radiating only around 12-13% of the luminosity of the Sun. [11] The concentration of elements other than hydrogen and helium, what astronomers term the star's metallicity , is much lower than in the Sun with a relative abundance of around 26% solar. [7] The apparent visual magnitude of this star is , which, at the star's estimated distance, gives an absolute magnitude of around (assuming negligible extinction from interstellar matter).

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