Psi_Eridani
Psi Eridani
Star in the constellation Eridanus
Psi Eridani, Latinized from ψ Eridani, is a star in the constellation Eridanus. With an apparent visual magnitude is 4.81,[2] it can be seen with the naked eye on a clear, dark night. Based upon an annual parallax shift of 4.41 milliarcseconds,[1] it is located roughly 740 light-years away from the Sun.
This is a B-type main-sequence star with a stellar classification of B3 V.[3] However, Houk and Swift (1999) classed it as a more evolved subgiant star. It is about 32[10] million years old and has a projected rotational velocity of 52 km/s.[3] The estimated mass is seven times that of the Sun,[7] and it has around 4.5 times the Sun's radius.[8] Psi Eridani shines with 2,878[7] times the solar luminosity from its outer atmosphere at an effective temperature of 18,700 K.[7]