The Taurean system was an uninhabited star system. This system was located at the extreme edge of an uncharted sector. This system consisted of a small primary and at least two planets, including Taurean II. This system was located less than 90 light years from the Sol system.
Over 150 years prior to 2269, Taurean II had been colonized by a humanoid species. In 2119, the first Earth ship was reported as missing. In 2269, the Federation had a recent discussion with the Klingons and the Romulans, in which it was revealed that ships were disappearing every 27.346 star years. The USS Enterprise was ordered to investigate the cause of the disappearances. On approach to the system, a signal sent from the Taurean system by the female Taureans temporarily affected the starship's male officers and thereby lured the vessel to the second planet, which was evacuated shortly thereafter. (TAS: "The Lorelei Signal"; ENT: "Two Days and Two Nights")