Designating the first world colonised in a system with more than one habitable world 'Prime' is yes good and very STAR TREK.
But rather than sticking with Latin (secundus etc.), if there is only one habitable world in the system I go with it's number, Eridani II, Rigel IV, etc. Where it's the only habitable 'world' and the satellite of a planet I generally name it colony, for example Altair colony.
Wonder what others to ?
But rather than sticking with Latin (secundus etc.), if there is only one habitable world in the system I go with it's number, Eridani II, Rigel IV, etc. Where it's the only habitable 'world' and the satellite of a planet I generally name it colony, for example Altair colony.
Wonder what others to ?