|Surface area||1,896,000,000 km²|
|Rotation period||24 hours|
11.857 per km²
|Capital planet of|
Bion IV is a terrestrial planet in the Appearence, the capital and largest planet of Bion Federation. It is the 13th most populated planet in the Appearance, the 5th most populated planet on its galactic arm, and the most populated in its sector. The planet was the origin of the Bion Federation, and is still autonomous despite a lot of other planets in the same nation.
Its abundant valuable resources, which allowed the civilization to become so strong, are largely traded off for commerce to other Bion planets such as Bronza II, Trano Major, and Frando Prime. It also trades water to the deprived planets of Frando Prime and Pandorum.