The Sigma Draconis star system was an inhabited planetary system consisting of its primary star and nine planets.

Three planets, Sigma Draconis III, Sigma Draconis IV, and Sigma Draconis VI, were classified as M class and populated by native species. The other planets in the system - Sigma Draconis I, Sigma Draconis II, Sigma Draconis V, Sigma Draconis VII, Sigma Draconis VIII, and Sigma Draconis IX - were not M-class. There were surveys and long-range scans of this system. Information on the system was stored in the library computers of Federation starships. In 2268, the USS Enterprise entered the system to search for Commander Spock's brain. (TOS: "Spock's Brain")

Lieutenant Commander Dan Curry was born on a non-Federation planet in this system. (TNG: "The Chase")

According to Star Trek: Star Charts (pp. 18, 19, 44) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), this Alpha Quadrant star was named Sigma Draconis and was located in Sector 004 (Sigma Draconis sector). This was a Federation system in the late 24th century.
In the Ninth UK Story Arc comics, the Enterprise returned to the Sigma Draconis system and discovered a planet composed entirely of liquid. It continued exploring the system in the Tenth UK Story Arc, discovering it to be a theater of warfare in the conflict between the Eldorians and the Norusians.

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