45 Aquarii is a star in the zodiac constellation of Aquarius. 45 Aquarii is its Flamsteed designation. It has an apparent visual magnitude of 5.96, which is bright enough to be dimly visible to the naked eye. The distance to this star is 332 light years based on parallax measurements, and it is drifting further away with a heliocentric radial velocity of +30 km/s.
The stellar classification of 45 Aquarii is K0 III, matching an evolved K-type giant star that has consumed the hydrogen at its core and expanded. It has an estimated 10 times the radius of the Sun and is radiating 50 times the Sun's luminosity at an effective temperature of 4,750 K.