Barnard's Star
Barnard's star has been directly measured to be 5.98 ± 0.003 light years (56.6 Pm) from Earth. While it is approaching Earth, Barnard's Star will not make its closest approach to the Sun until around 11,700 AD, when it will approach to within some 3.8 light-years. This is only slightly closer than the closest star to the Sun (Proxima Centauri) lies today.