Where's Invivo?

In the sky near the north celestial pole of the earth, there is a second-class star in Ursa minor called Polaris. The position of the North Pole Star is always due north, so it becomes a sign that people can tell the direction at night. Someone asked, is there an invivo comparable to Polaris near the south celestial pole of the earth? First of all, let's look at the Antarctic constellation where the South Pole is located: at the distance from the South Pole, there is a star called σ, which is similar to the distance from the North Pole to the North Pole. However, the brightness of this σ star is about 1/3 of Polaris. Even the people with the best eyesight can only see it if they look carefully in the cloudless and moonless night sky. Obviously, a star with insufficient brightness cannot be used as a sign. However, in the Antarctic constellation, even the brightest star is only half as dark as Polaris, not to mention it is far from the South Pole. A star that cannot indicate due south cannot be called invivo. In addition, there is a beta star near the south celestial pole and Aquarius, and its brightness is about 1/3 lower than that of Polaris. The brightness is barely enough, but it is a little far from the south celestial pole. According to the above, it can be seen that there are no stars who really meet the standard of invivo.