Barkon IV was the inhabited fourth planet of its star system. This was the homeworld of the pre-industrial society of the humanoid Barkonians. The planet had a Luna-like moon and was home to the Vellorian Mountains.
In 2370, a Federation deep space probe crashed on the planet. The crash site was over a hundred kilometers from the nearest settlement. The probe's power source was radioactive and when the casing of the probe cracked on impact the radiation caused some Barkonians to suffer the effects of radiation poisoning. Lieutenant Commander Data was dispatched to retrieve and salvage the probe's components but suffered memory loss when he attempted to download the sensor logs from the probe's on-board computer and was exposed to a power surge. He lived on the planet for several weeks before being attacked by a mob and severely damaged. (TNG: "Thine Own Self")