Canopus Major was a planet.
In 2293, the location of Canopus III, a sister planet, in the Milky Way Galaxy was labeled in a star chart that was in Captain James T. Kirk's quarters aboard the USS Enterprise-A. (Star Trek VI: The Undiscovered Country, okudagram)
In 2371, the location of Canopus Major was labeled in the star chart Data and Picard were studying in stellar cartography aboard the USS Enterprise-D. (Star Trek Generations, okudagram)
Next to the identifying label, there was a number, "007".