Barnard's star

Barnard's Star, also known as Barnard's Runaway Star,^[1] is a very low-mass red dwarf star approximately six light-years away from Earth in the constellation of Ophiuchus (the Snake-holder). It is very old, and moving relatively fast.

In 1916, the American astronomer E.E. Barnard measured its proper motion as 10.3 arcseconds per year. This is the largest-known proper motion of any star relative to the Sun.^[2] 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. Despite its proximity, Barnard's Star, at a dim apparent magnitude of about nine, is not visible with the unaided eye; however, it is much brighter in infrared light than it is in visible light.

1. ↑ "Parallax of Barnard's "Runaway" Star". Nature. 99 (2484): 293. 1917. Bibcode:1917Natur..99..293.. doi:10.1038/099293a0. S2CID 3959419.
2. ↑ Barnard, E.E. (1916). "A small star with large proper motion". Astronomical Journal. 29 (695): 181. Bibcode:1916AJ.....29..181B. doi:10.1086/104156.