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Psi Aquilae
Psi Aquilae, Latinized as ψ Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. It is a faint star with an apparent visual magnitude of 6.25,[2] which, according to the Bortle Dark-Sky Scale, can be seen with the naked eye in dark rural skies. The orbit of the Earth causes an annual parallax shift of 2.83 mas,[1] which indicates a distance of approximately 1,150 light-years (350 parsecs). The spectrum of Psi Aquilae matches a stellar classification of B9 III-IV,[3] with the luminosity class of III-IV indicating the spectrum lies part way between that of a subgiant and a giant star. The effective temperature of the star's outer atmosphere is 10,814 K,[8] giving it the blue-white hue of a B-type star.[11] It has nearly four[7] times the radius of the Sun and has a projected rotational velocity of 20 km/s.[9] References
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