Barnard 's Star is the fourth-closest known individual star to the Sun , after the three components of the Alpha Centauri system , and the closest star in the Northern Hemisphere .
At a distance of about 1.8 parsecs from the Solar System , or just under six light-years , Barnard 's Star is the nearest known star in the constellation Ophiuchus , and the fourth-closest known individual star to the Sun , after the three components of the Alpha Centauri system .