Rigel V was the inhabited fifth planet of the Rigel system.

Prior to stardate 3842, an experimental medical trial of a chemical stimulant was successfully completed on Rigelian test subjects on this planet. This stimulant sped up reproduction and replacement of blood in the body. (TOS: "Journey to Babel")

During the Whale Probe crisis of 2286, a Starfleet Command Table Operator reported that they were updating graphics from Rigel V. The line mentioning this location was scripted for Star Trek IV: The Voyage Home, but was ultimately unused in that film. [1]
According to Star Trek: Star Charts (pp. 52, 59, "United Federation of Planets I"), Rigel V, also known as Beta Rigel V, was an M-class planet. The planet was a member planet of both the United Rigel Colonies and the United Federation of Planets. Rigel IV was admitted, along with the United Rigel Colonies, to the Federation in 2202. According to The Worlds of the Federation (p. 36), Rigel V became a Federation member in 2184

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