33 Boötis

33 Boötis is a single star in the northern constellation Boötes, located 188 light years away from the Sun. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.39. The object is moving closer to the Earth with a heliocentric radial velocity of −13 km/s, and is catalogued as a member of the Pleiades supercluster.

This is an ordinary A-type main-sequence star with a stellar classification of A1 V. It is a source of X-ray emission, but early A-type stars are not expected to be an X-ray source so this may indicate it has an undetected companion. 33 Boötis is 142 million years old with a projected rotational velocity of 86 km/s. The star has 2.25 times the mass of the Sun and is radiating 21 times the luminosity of the Sun from its photosphere at an effective temperature of 10,176 K.