Rigel IV
Rigel IV was the inhabited fourth planet of the Rigel system in the Alpha Quadrant. It was home to the Rigel IV natives, including the , and had deposits of boridium and murinite. ()

History 
Humans began moving to Rigel IV after 2156. () 

In 2266, the Redjac entity possessed Hengist, a native of Rigel IV, and killed several women on the planet. He was never caught and was only known as "Beratis". On Argelius II, Redjac committed a murder with a knife from Rigel IV's Argus River region. () 

In the 24th century, a brilliant astronomer with a fondness for the Betazoid Ambassador Lwaxana Troi resided on Rigel IV. He named a star after Lwaxana, or so she claimed in 2367. ()

In mid-2370, Rigel IV hosted a nearly week-long conference on hydroponics attended by Keiko O'Brien. ()

Rigel IV was also the site of a pergium refinery. During the Dominion War, a shipment of pergium en route to Rigel IV from the Sappora system had been destroyed by the Jem'Hadar. ()

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 .

According to StarTrek.com, Rigel IV was a M-class Federation world. 

Assuming it was in the same system as Rigel X, it was presumably located less then ninety light years from Earth. This is because Enterprise visited Rigel X before it visited Risa, which in  was said to be ninety light years away and the furthest Humans had ever traveled from their home.

A question, which was not seen on screen, from Spock's memory test in  established that Rigel IV at one point signed a peace treaty with Argus. The treaty was important because it set a legal precedent that, "All beings may not be created equal yet shall be given equal opportunity and treatment under the law."

Apocrypha 

According to Star Trek: Star Charts (pp. 52, 59, "United Federation of Planets I"), Rigel IV, also known as Beta Rigel IV, 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.

The novel Tower of Babel depicted Rigel IV as the homeworld of the Zami, who were the Vulcanoid Rigelians mentioned in "Journey to Babel" and "Inter Arma Enim Silent Leges". The Zami of Rigel IV as well as the Chelons of Rigel III were introduced to spaceflight by the Jelna of Rigel V. By the 22nd century, they had united as the system-spanning United Rigel Worlds and Colonies, which were admitted into the Federation in 2164.

External links 
 
 

de:Rigel IV
es:Rigel IV
fr:Rigel IV
ja:ベータ・ライジェル4号星
Rigel 04
Homeworlds