Threus

Threus is the homeworld of the Vannah. It is a garden planet orbiting the star Yesun in the Triangulum Galaxy.

Characteristics
Threus orbits 0.85AUs from Yesun, a G6V-class star.

Size
Threus has a diameter of 13,500km and a mass of 0.9 Earths. It has a density of just over three-quarters of Earth's and a surface gravity of 0.8g.

Dynamics
The planet takes 19.9 hours to rotate. Its axial tilt is 12.3 degrees, and is stabilised by its moon. It takes 301 Earth days to revolve around its star.

Composition
The crust of Threus is 44.5% oxygen, 28.1% silicon, 7.4% aluminium, 5.2% iron, 3.9% calcium, and the remainder other elements.

Surface
Threus' surface is 45% water. Most of the remainder is desert and savannah, with no ice caps. The average global temperature is 23 degrees centigrade.

Atmosphere
The atmosphere of Threus is 79.1% nitrogen, 19.2% oxygen, 1.6% argon, and the remainder other gases.

Satellites
Phenomon is a moon of 0.64 lunar masses that orbits Threus at 400,000km.

Ecosphere
Life exists on Threus. The seas are extremely diverse, as are the coastal forests. However, the savannahs are not very biomass-rich.

Inhabitants
The Vannah come from this world. It has a current population of five billion, in very large coastal cities.