Barnett's World was a namesake planet that was located somewhere in the Alpha or Beta Quadrant. This planet's position was labeled on a star chart displayed on the guidance system S/COMS panel aboard the Amargosa observatory in 2371. (Star Trek Generations)
This planet was only mentioned in writing.
In August 2024, this panel was put up for auction in the Entertainment Memorabiliia Live Auction: Los Angeles Summer 2024 by Propstore Auction. [1]