Memory Alpha
Memory Alpha

The Delos system was an inhabited planetary system which was located somewhere in the Alpha or Beta Quadrant. This was a single star system with a primary and at least four planets, including Ornara and Brekka.

Before 2164, a Federation scout ship made contact with this system. The ship discovered two inhabitable planets; one of which was on the verge of acquiring spaceflight. Two centuries later in 2364, the starship USS Enterprise-D visited the system to chart the solar flare activity of the star Delos. (TNG: "Symbiosis")

StarTrek.com identified two systems as being named Delos. The other Delos system was a Federation system. [1](X)
In the script for "Symbiosis", Delos was listed in the pronunciation guide, where the term was pronounced as "DELL-ose". [2]

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