The Border system was so named because it lied exactly on the border of the Expansion Region. Its star, Pin, was yellow-white and medium in size. Pin was surrounded by six planets, one of which, Holt, was habitable. Of the others, four were gas giants and the other was too small to contain an atmosphere. There were also four charted dwarf planets, and 213 charted moons, most of them which orbited the gas giants.