39 Aquarii
39 Aquarii is a star in the zodiac constellation of Aquarius. "39 Aquarii" is its Flamsteed designation. It is a faint naked eye star with an apparent visual magnitude of 6.03. Based upon an annual parallax shift of 23.78 measured with a 3% margin of error, this star is at a distance of around from Earth. It is a double star with a magnitude 9.3 companion at an angular separation of 0.6 arcseconds along a position angle of 257°. The stellar classification of this star is F0 V; hence it belongs to the category of F-type  main sequence stars that generate energy through hydrogen fusion at the core. It is 1.8 billion years old with 1.35 times the mass of the Sun and 1.79 times the Sun's radius. The star is radiating 6.1 times the luminosity of the Sun from its photosphere at an effective temperature of 6,806 K.