Lalande 21185
From Memory Alpha, the free Star Trek reference.
Lalande 21185 was a star located about 8.3 light years from Sol.
On several occasions in 2364, viewscreen readouts aboard the USS Enterprise-D showed the location of Lalande 21185, 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. Lalande 21185 was not a destination on any of the routes.
Lalande 21185 is a real star in the Ursa Major constellation. Modern scientists have determined it is spectral class M2nV.
