Grid Epsilon is the region of space in which Babylon 5 and Epsilon III were located, at coordinates 470 by 18 by 22. In 2258, Catherine Sakai came across a class 2 planetoid in Grid Epsilon at coordinates 471 by 18 by 25. The planetoid's atmosphere was too thin to sustain sentient life, but its mineral content included high levels of platinum, derinium, and any number of valuable materials.