22 Vulpeculae

22 Vulpeculae is a binary star system in the northern constellation Vulpecula. Based on its parallax, it is located some 1,490 light-years away, and it has an apparent magnitude of about 5.176, making it visible to the naked eye. The system is moving closer to the Earth with a heliocentric radial velocity of −23 km/s.
The pair have an orbital period of in what is assumed to be a circular orbit. The primary component is a G-type bright giant. It is over five times as massive as the Sun, and over 77 times as wide. Its companion is a B-type main-sequence star, 3.4 times as massive as the Sun. The stars have an orbit that are oriented in such a way that they periodically eclipse each other, blocking the other star's light. For that, it has been given the variable star designation QS Vulpeculae; "22 Vulpeculae" is the Flamsteed designation.