Epsilon Sagittarii (ε Sgr, ε Sagittarii) is a binary star system in the southern zodiac constellation Sagittarius. The star forms the base of the archer's "bow" in Sagittarius and also marks the base of the spout of the so-called "Teapot" asterism. Its traditional name is Kaus Australis, from Arabic قوس qaws 'bow' and Latin austrālis 'southern'. The apparent visual magnitude of +1.85[2] makes it the brightest star in the constellation. Based upon parallax measurements, the distance to this star is around 143 light-years (44 parsecs).

Excerpt from Wikipedia.