Fomalhaut (Alpha Piscis Austrini) was an A class star that was located a number of parsecs away from Earth and the Sol system, in Federation space, near the border between the Alpha and Beta Quadrants.
This star is located a very short distance from Nakarat, which is considered to be its companion star.
The Federation starship USS Fomalhaut was named for this location. (TOS reference: Star Fleet Technical Manual)
This system is the location of planet Fomalhaut V. (TOS novel: The Truth Machine)