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Pi2 Gruis

π<sup>2</sup> Gruis, Latinised as Pi<sup>2</sup> Gruis, is a binary star system in the southern constellation of Grus. It is faintly visible to the naked eye as a yellow-white hued star with an apparent visual magnitude of 5.622. Based upon an annual parallax shift of as seen from the Earth, the system is located 130&nbsp;light years from the Sun.

The primary, component A, is an F-type star of uncertain luminosity class. Malaroda (1975) gave it a stellar classification of F3&nbsp;III-IV, which would indicate an evolving subgiant/giant star hybrid spectrum, whereas Houk (1978) listed it as class F0&nbsp;V, suggesting that it is an F-type main sequence star. It has been considered to be a chemically peculiar star, but this is now considered doubtful. It is 758&nbsp;million years old with 1.4 times the mass of the Sun. The star is 1.9 times the Sun's radius and is radiating 7 times the luminosity of the Sun from its photosphere at an effective temperature of 6,788&nbsp;K.

The companion is a magnitude 11.3 star at an angular separation of 4.6&nbsp;arc seconds. Gaia Data Release 2 has measured a separate annual parallax for it of , almost identical to the primary star, and indicates that it is a red dwarf.

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