Delos IV was the inhabited fourth planet in its star system. Lieutenant Adele Simmons, a crewmember aboard both the USS Enterprise-D and USS Voyager, was born on this non-Federation planet.

In 2352, Beverly Crusher interned under Dr. Dalen Quaice on this planet. (TNG: "Remember Me")

In 2369, this planet was listed on the chart USS Enterprise Personnel Database, which was seen on Jean-Luc Picard's PADD on aboard the Enterprise-D. (TNG: "The Chase", okudagram)

According to, there were two systems named Delos and this Delos IV was not the same planet as Brekka.
According to the Star Trek: Star Charts ("United Federation of Planets I"), in 2378, Delos IV was listed as a Federation member.

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