It is sometimes called the "runaway star"  due to its large tangential velocity which moves it a moon width in 180 years.
It is the fifth-closest star, after the sun and the three stars of the Alpha Centauri system.  A red dwarf in the constellation Ophiuchus, it's so faint it wasn't discovered until 1916.  It is sometimes called the "runaway star"  due to its large tangential velocity which moves it a moon width in 180 years. For 10 points, what star, named for an American astronomer, has the greatest known proper motion
It is the fifth-closest star, after the sun and the three stars of the Alpha Centauri system.  
Barnard's star