Rigel V
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. ()

Appendices

Background information 
This planet's quadrant of origin is inferred based on the position of its star system as seen in the star chart appearing in .

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 , but was ultimately unused in that film. 

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  and the United Federation of Planets. Rigel IV was admitted, along with the United Rigel Colonies, to the Federation in 2202.

Apocrypha 
According to The Worlds of the Federation (p. 36), Rigel V became a Federation member in 2184.

The novel Tower of Babel depicted Rigel V as the home of the Jelna, the Rigelians seen in Star Trek: Enterprise. They were the first species in their system to achieve spaceflight and made contact with their neighbors, the Zami of Rigel IV and the Chelons of Rigel III. Together, all three native species as well as extrasolar immigrants formed the system-spanning United Rigel Worlds and Colonies, which were admitted into the Federation in 2164.

External link 
 

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Rigel 05