Oya II is the second planet from the sun of the Oya system, United Empire of Earth (UEE). Although it lacks a metallic core, it has a magnetic field that is generated by large deposits of magnesium oxide deep in its mantle.
During the 2580s SEY, a group of Human anti-Messer separatists set up a small settlement on Oya II, choosing it over the naturally-inhabitable Oya III due to the presence of a small Xi'an colony there. They were able to remain undetected by the Xi'an colonists until MXY III.882 (SEY 2587), when the UEE Navy located the Oya-Castra jump point while trying to track down the separatists who had been conducting raids in the Castra system when they were low on supplies.
Xi'an colonists who witnessed the UEE Navy ships attacking and killing their own people reported to the Xi'an government that there seemed to be elements within the UEE that rejected Messer leadership. Currently, the planet is home to several active mining operations.