Ptah, also known as Regulus V, was a planet, the fifth in the Regulus star system. (TOS - Star Trek II Short Stories short story: "The Blaze of Glory")

Regulus V was one of over twenty planets inhabited by Regulan felinoids, who are also known as Caitians. Some references call Regulus V the homeworld of this species, although their identity is also centralized to the 15 Lyncis system. (Decipher RPG module: Starfleet Operations Manual)

By the 2370s, Regulus V was a full-fledged Federation member planet. (ST reference: Star Charts)

Regulus V had at least one native lifeform, the eel-bird. (TOS episode: "Amok Time")



planets of the Regulus system
I. Horus • II. Arodi ~ Osiris • III. Khepri • IV. Khonsu • V. Ptah • VI. Rhamses • VII. Nefertari • VIII. M-113Regulus IXRegulus XRegulus XIRegulus XIIRegulus XIII

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