Adelphous IV was the fourth planet in the Adelphous system which sustained a population prior to 2381.
The USS Enterprise was headed for this world in 2367 when Data relieved Worf of command at the beginning of the night shift. (TNG episode: "Data's Day")
During the Borg Invasion of 2381, over seven thousand Borg cubes launched a simultaneous attack on the Alpha and Beta Quadrants from the Azure Nebula; Adelphous IV was one of the planets attacked and its population wiped out. (ST - Destiny novel: Mere Mortals)
- Startrek.com spells the planet as Adelphus IV.
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