Tags: Star.
Alpha Tucanae (α Tuc α Tucanae) is a binary star system in the southern circumpolar constellation of Tucana. With an apparent visual magnitude of 2.86 it can be seen with the naked eye from the southern hemisphere. Using parallax measurements the distance to this system can be estimated as 200 light-years (61 parsecs). A cool star with a surface temperature of 4300 K it is 424 times as luminous as the sun and 37 times its diameter. It is 2.5 to 3 times as massive.
