Perseii

Perseii is the planet that was the setting for Wrong Way Up from partway through the 5th week until the end. It is placed right up against Elysium such that their gravity fields and atmospheres overlap, allowing vehicles to transition between them without space travel, usually by accident.
The mod for the planet was created by Splitsie and can be found on the Steam Workshop here: https://steamcommunity.com/sharedfiles/filedetails/?id=2645965110