Fradon was a star system, located somewhere in 24th century Federation space in the galaxy's Alpha or Beta Quadrants.
History and specifics[]
The Fradon system's orbit was the location of a number of worlds, including second planet Fradon II, location of a Federation supply depot that was attacked by Cardassians in the 2350s decade, in the year 2357. (ST - The Fall novel: Peaceable Kingdoms)