Barnard's Star
From Memory Alpha, the free Star Trek reference.
Barnard's Star was a star located about 5.9 light years from Sol.
On several occasions in 2364, viewscreen readouts aboard the USS Enterprise-D showed the location of Barnard's Star, in the form of charts from the Enterprise-D library computer. (TNG: "The Naked Now", "The Last Outpost", "Conspiracy")
[edit] Background
The Enterprise computer's star chart was a drawing by Rick Sternbach that had originally been published, years earlier, on page 77 of the non-canon reference book Spaceflight Chronology. This chart showed Earth commercial and exploration routes after the use of warp drive began. Barnard's Star was a destination on an exploration route.
Barnard's Star is a real star in the Ophiuchus constellation. Modern scientists have determined it is spectral class M4V.
