The Melkotian homeworld was an inhabited planet. This world was the homeworld for the Melkotians, a non-humanoid telepathic species.

First contact was made by the USS Enterprise in 2268. (TOS: "Spectre of the Gun")

According to The Worlds of the Federation, Melkot is the second planet in the Theta Kiokis system.
According to the book Star Trek: Federation - The First 150 Years, the planet is called Melkotia.