Phi Aquilae (φ Aql, φ 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 (67 parsecs) 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.
Famous quotes containing the word phi:
“Adolescents have the right to be themselves. The fact that you were the belle of the ball, the captain of the lacrosse team, the president of your senior class, Phi Beta Kappa, or a political activist doesn’t mean that your teenager will be or should be the same....Likewise, the fact that you were a wallflower, uncoordinated, and a C student shouldn’t mean that you push your child to be everything you were not.”
—Laurence Steinberg (20th century)