Alpha Delphi IX

Alpha Delphi IX was the inhabited ninth planet in its star system. This planet was located somewhere in the Alpha or Beta Quadrant.

In 2336, Leah Susan Brahms was born on this planet in Damascus City. (TNG: "Booby Trap", okudagram)

This planet was only mentioned in writing.
In the Bayer designation, which was a system of stellar classification, the Greek letter indicated the brightness of a star in a constellation. In this case, Alpha Delphi would be the 1st brightest star in its constellation.