Helios Alpha

Helios Alpha is a main sequence star of spectral class G2V and has a mass of 1.0, and was the first system settled by the Colonials after the exodus from Kobol, having first set foot on Gemenon. It and Helios Beta orbit a common barycenter maintaining a separation of 63 SU. Helios Alpha is more massive and is closer to the system's barycenter. The pair complete an orbit once every 373 years.

• Planets and Other Astronomical Bodies
  • Icarus - A small planet located close to the star. It has a molten surface which makes mining and exploration impossible.
  • Picon - This colony has an inclined orbit.
  • Caprica and Gemenon - These two colonies form a binary planet.
  • Tauron - One of only three colonies to feature a moon, named Minos. It is the only moon with a ring, and home to several mining and scientific outposts.
  • Erebos asteroid belt - This asteroid belt is rich in minerals, which were mined by Tauran prospectors for hundreds of years.
  • Zeus - A gas giant located at the outer edge of the system. This gas giant is the largest planet in the four systems, with a diameter of 153,000 km at the equator. The planet has 74 moons, the largest of which are Nike and Hebe. Constant upper atmosphere lightning creates an aurora effect that can be seen with the naked eye.
  • Persephone - Classified as a dwarf planet, Persephone is the outermost planet in the system and features an inclined and eccentric orbit. Colonial scientists believe this planet could be an escaped moon of Zeus.

This system is unique in the fact that Caprica and Gemenon share an orbit around a common barycenter. According to the Colonial map, the planets orbit each other once every 28.2 days, and are separated by a distance of 493,000 km. Based on these numbers, Kepler's Third Law tells us that the combined mass of these colonies is about twice that of Earth.