The second-closest star to the Sun, 5.9 l.y. away in Ophiuchus. It is an M4 dwarf of apparent magnitude 9.5, with a luminosity 2000 times less than the Sun's. It has the largest proper motion of any star known, 10″.36 per year, as was discovered in 1916 by E. E. Barnard, after whom the star is named.
Subjects: Astronomy and Astrophysics.