HADAR - also known as Beta Centauri, is the second brightest star in the constellation Centaurus and the tenth brightest star in the nighttime sky. Beta Centauri is a blue-white giant star that is approximately 525 light-years from the solar system. The name Beta Centauri comes from the Arabic word for "ground", while the name Agena comes from Latin words for "the knee".
Hadar is well-known in the Southern Hemisphere as the inner of the two "Pointers" to the Southern Cross. A line made from the other pointer, Alpha Centauri, through Hadar leads to within a few degrees of Gacrux, the star at the top of the cross. Using Gacrux, a navigator can draw a line with Acrux to effectively determine south.
