|Quadra Sigma III|
|Location:||Sigma III system|
|Affiliation:||United Federation of Planets|
Quadra Sigma III was the third planet of the Sigma III system. Prior to stardate 41590, the Federation established a mining colony on this planet. The population was counted at 504, including 38 children.
In 2364, the Quadra Sigma III colony transmitted a distress signal for urgent medical help when an explosion resulting from a methane-like gas seeping from underground devastated a mining operation there. The USS Enterprise-D was fortunately close enough to render assistance to the survivors. Soon after rescuing the survivors, the colony was abandoned. (TNG: "Hide and Q")