Adelphous IV was the fourth planet orbiting the primary Adelphous, in the Beta Quadrant.

In 2367, the USS Enterprise-D was on course to this planet when Data assumed command of the Federation starship at the beginning of the night watch. (TNG: "Data's Day"; DIS: "Magic to Make the Sanest Man Go Mad")

This planet was only mentioned in dialogue.
Adelphous, the primary of Adelphous IV, was located in the Beta Quadrant on a star chart seen in the Star Trek: Discovery episode "Magic to Make the Sanest Man Go Mad".

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