Periphery (1st Edition) stated that there were 10 "almost ideal" worlds within the Hyades Nebula suitable for human colonization. However, in canon, we only have Taurus, Ishtar, Samantha, Jamestown, Ina, Megaris, Menion, and Parian . . . and of those, apparently Ina, Megaris, Menion, and Parian 'dropped off the map' sometime during the Succession Wars.
So I needed two more systems . . . and I made them up. New Columbia and Aurora. They ain't canon. They are mine. Homebrew.
As for the location? Somewhere within 1 jump of Taurus, Ishtar, Samantha, Jamestown, and the other worlds of the Nebula. Certainly less than a dozen light-years. Where exactly? I don't know. Because it doesn't really matter to my head-canon.
MA