The Helios system is a planetary system in the United Empire of Earth (UEE), consisting of a peculiar main sequence B-type star, three terrestrial planets, and a gas giant. The system's most populated planet, Tangaroa (Helios II), has a brackish water ocean that gives rise to waves hundreds of meters high.
It was discovered in SEY 2529 by a group of outlaws known as the Daybreak Marauders, who used it as a launching point for their frequent raids on convoys in the Ellis system. That same year, it was officially annexed by the United Planets of Earth (UPE) when Advocacy agents Avon Dorville and Gia Trask tracked the Daybreak Marauders to their hidden jump point in the Taranis system.