Sirona

Sirona is the name given to the star and system that was eventually settled by humans pre-cataclysm. The name is taken from a Gallic goddess, usually associated with healing springs. The system had been discovered way before the first wormhole station was built, and was given a Alpha-numerical designation. When humanity began to explore the system thanks to the wormhole station, it was given its present name, and the planetary bodies (some detected beforehand) were given temporary names of Sirona I through VI.

The name refers to both the star and the system, the latter usually spoken of as the "Sirona system" or the "Sironian system". The star itself is a K-type, slightly smaller and cooler than the Sun.

= The planets = The system consists of 6 planets, four solid ones and two gas giants.

Sirona I
Sirona I is the closest planet to the star. It's somewhat larger than Mercury.

Dawn
See also: Dawn

Dawn (formerly Sirona II) is the sole remaining planet with a living, biological population of humans, descendants of early settlers and earthen refugees from the Cataclysm. It is the home of 3 million people.

Sirona III
The third planet in the system, Sirona III is about twice as massive as Dawn, but too far outside of the goldilock zone to support any life.

Sirona IV
Sirona IV is a gas giant, mostly red in colour. It sports a single but very prominent planetary ring. It is also the largest planet in the system, slightly larger than Jupiter.

Sirona V
Sirona V is a gas giant, of similar size to Jupiter. The gas clouds give it a mixed colour scheme of various shades of blue and purple.

Sirona VI
Sirona VI is the final planet in the Sirona system, and is about the same size and mass of Dawn.

Sirona VI behaves differently from the other planets. As well as being the furthest planet from the star, its orbit is highly eliptic and eccentric and slanted at an angle. There has also existed liquid water on the surface at one point, as evident by the fact that the planet is completely covered in ice. However, as the average surface temperature has never been observed to go above 60 Kelvin, there is no consensus as to how liquid water could have existed on the surface at all.

The most prominent theory is that Sirona VI was once a rogue planet, picked up by Sirona in passing and integrated into the star system. This explains the irregular orbit, and also implies that Sirona VI may once have been in another star system, much closer to the host star, allowing liquid water to exist on the surface.

= Other noteworthy features =