According to the Star Trek: Star Charts (pg. 62), the Epsilon system was located in a nebula that was located in or near to Klingon space, in the Beta Quadrant. This system, also known as Epsilon Hydrae, was a five star system. Primary was a Class G star with a magnitude of +7, which was 1/10 as bright as Sol. The secondary and tertiary were Class G stars. The quarternary and quinary were Class K stars.