Bayard's Planet on a star chart
Bayard's Planet was a planet. In 2165, a concussion ring created by the supernova of Phi Puma had reached this planet.
On several occasions in 2364, viewscreen readouts aboard the USS Enterprise-D showed the location of Phi Puma's nova, in the form of star charts from the Enterprise library computer. (TNG: "The Naked Now", "The Last Outpost", "Datalore", "Conspiracy")
This star chart was drawn by Rick Sternbach for the Star Trek Spaceflight Chronology in the late 1970s. This chart was found on page 151.