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. 
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.
|Rigel II • Rigel III • Rigel IV • Rigel V • Rigel VI • Rigel VII • Rigel X • Rigel XII • An asteroid belt|
|See also: • Beta Rigel • Rigel Beta|