Barnard's Star /ˈbɑːrnərdz/ is a red dwarf about 6 light-years away from Earth in the constellation of Ophiuchus. It is the fourth nearest known individual star to the Sun after the three components of the Alpha Centauri system and the closest star in the Northern Celestial Hemisphere. Its stellar mass is about 14% of the Sun's. Despite its proximity, the star has a dim apparent magnitude of +9. 5 and is invisible to the unaided eye; it is much brighter in the infrared than in visible light.