Alvacorn Major was a star.
In 2365, the Federation starships USS Enterprise-D and USS Repulse rendezvoused near this star. During this rendezvous, the Repulse transferred Doctor Katherine Pulaski to the Enterprise-D. (TNG: "The Child")
The name of this star was from the script. [1] According to the script, Alvacorn Major had a stellar companion.