Ket-Cheleb (also known as Vulcan/Vulcanis A I, Nevasa I, Ko'vel I or 40 Eridani A I) was a planet, the first planet in the 40 Eridani star system, in orbit of the star 40 Eridani A. (Last Unicorn RPG modules: The Way of Kolinahr, Planets of the UFP) The first planet of Vulcan's system was first mentioned as early as ST reference: Spaceflight Chronology, although it was never named except in two installments of the Last Unicorn RPG. ST reference: Star Trek Maps identified the system's first world as Vulcan itself, omitting all references to additional planets beside Vulcan's sister world.