Sigma Draconis system

A map of the Sigma Draconis system

Sigma Draconis VII was the seventh planet in the Sigma Draconis system. This was one of six planets in this system that was not classified as M class.

The position and orbital path of Sigma Draconis VII was depicted on a system map that was displayed on the main viewscreen of the USS Enterprise bridge in 2268. (TOS: "Spock's Brain")

While in command and recording his only log entry in TOS, Sulu inadvertently called Sigma Draconis VI "Sigma Draconis VII". Kirk also inadvertently refers to Sigma Draconis VI as "Sigma Draconis VII" in his own later captain's log, even though he himself referred to the planet as "VI" twice earlier in the episode.
According to Star Trek: Star Charts (pp. 18, 19, 44) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Sigma Draconis system was located in Sector 004 (Sigma Draconis sector), in the Alpha Quadrant. This was a Federation system in the late 24th century.
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