I havent wrote it down because they could change position as new planets come out.
Currently the list is
Maraxsis: Hydraulic plant merge if active, Greenhouse and Core Miner
Corrundum: Petrochemical Facility and Arc Furnace
Secretas: Salvager
Tenebris: Advanced Assembling Machine
Terra Palus: Biochemical Facility
Castra: Forge
Lignumis: Lumber Mill merge if active
