Star chart of surrounding area
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")
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 titled Spaceflight Chronology. This chart showed Earth commercial and exploration routes in the 2050s and 2060s, but no text attesting to this fact was included in the portion used on screen, just the labeled names of the stars. However, as the book was published before Trek-history established, that Earth's first warp flight took place in 2063 (rendering interstellar travel more or less impossible before), the star chart, or at least its dating, must be erroneous.
Lalande 21185 is a real star in the Ursa Major constellation. Modern scientists have determined it is spectral class M2nV.