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  • Phi Aquilae is the Bayer designation of a binary star system in the equatorial constellation of Aquila. It has an apparent visual magnitude of +5.28 and is visible to the naked eye. With an annual parallax shift of 14.86 mas, this star is located at a distance of approximately 219 light-years from Earth. Phi Aquilae is a single-lined spectroscopic binary with an orbital period of 3.32068 days. The primary component is a subgiant star with a stellar classification of A1 IV. The outer atmosphere has an effective temperature of 9,509, giving it a white-hued appearance of an A-type star. The orbiting companion may be the source of the X-ray emission from this system, as stars similar to the primary component do not generally produce detectable levels of X-rays.

Freebase Commons Astronomy /astronomy