Procyon V
Procyon V was the fifth planet orbiting Procyon, located in the Andorian system.

In a possible future, the historic Battle of Procyon V was fought at this location in the 26th century, between the United Federation of Planets and the Sphere-Builders, wherein the forces of the Federation were successful in driving the Builders back into their transdimensional realm. ()

Appendices

Background information 
A picture of a star chart supposedly used for  was tweeted by Ted Sullivan on 28 November 2017. According to this map, the star Andoria was also known as Procyon, or Alpha Canis Minoris. 

Confirmation of Andoria being in the Procyon system, or Andorian system, was made in the star chart created for the  episode . Unlike the earlier star chart, this one was seen in the episode. In the newer chart, the label "Procyon (Andoria)" was used.

Apocrypha 
In the game Star Trek Online, the Procyon system is not the Andorian system but rather a system directly adjacent to it, and Procyon V is said to be one of the first exoplanets visited by Andorian space explorers.

External link 
 

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Procyon 05