Rigel IX

Rigel IX is the ninth planet of the Rigel system.

Background information
Given the number of "Rigelian" species and the large number of inhabited worlds, it is entirely possible that there is more than one "Rigel" system, that the system is actually more of a "star cluster" than a single system, or that some of the species called "Rigelian" (or "Rigellian") are not actually from the system. Source material tends to be vauge on these matters.