A ninth magnitude star in the constellation Ophiuchus that has the largest known proper motion of any star, a fact discovered by the American astronomer E. E. Barnard in 1916. Its position in the sky changes by 10.3 arc seconds each year as it moves through space relative to the Sun. It is the third-nearest star to the Sun at a distance of 5.88 light years. Possible wobbles in the motion of Barnard’s star have been interpreted as indicating the presence of unseen planets, but this suspicion has not been confirmed.