(covers information from several alternate timelines)
In 2364, the location of Procyon was labeled in a star chart of a stellar neighborhood with Sol at the center. This chart was stored in the USS Enterprise-D library computer. Later that year, the chart was scanned by Outpost 63. (TNG: "The Naked Now", production art; TNG: "The Last Outpost")
Background information Edit
The star chart naming the stars within 20 light years of Sol was drawn by Rick Sternbach for the Star Trek Spaceflight Chronology in the late 1970s. Found on page 77, this chart showed Earth commercial and exploration routes after the use of warp drive began. There were no commercial or exploration routes to this system.
According to Star Trek: Star Charts, (Pgs 19, 45, 60) Procyon, also known as Alpha Canis Majoris was located in the Beta Quadrant, in or near the Federation, in the Andorian Sector (Sector 006). The homeworld of the Andorians, Andor (Andoria), was located in the system. Procyon A of the binary star system was a F class star with a magnitude of +3, ten times brighter than Sol. Procyon B was an A class star.