Magnitude 6.25 | ||
People also search for Upsilon Aquilae, Tau Aquilae, Phi Aquilae | ||
Psi Aquilae (ψ Aql, 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, 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 3.22 mas, which indicates a distance of roughly 1,000 light-years (310 parsecs).
The spectrum of Psi Aquilae matches a stellar classification of B9 III-IV, 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, giving it the blue-white hue of a B-type star. It has nearly four times the radius of the Sun and has a projected rotational velocity of 20 km/s.