Sigma Draconis IV was the inhabited fourth planet in the Sigma Draconis system. Classified as M-class, this moonless planet was the homeworld for the Sigma Draconis IV natives.
By 2268, the inhabitants were a pre-spaceflight culture with an industrial scale rating of G, equivalent to Earth in 2030.
The position and orbital path of Sigma Draconis IV was depicted on system maps that were displayed on the main viewscreen of the USS Enterprise bridge in 2268. (TOS: "Spock's Brain")
According to the Star Trek: Star Charts (pgs. 19, 44), Sigma Draconis IV was located in Sector 004 (Sigma Draconis sector).