Starship Encounters: are there any more detailed 2e rules beyond the Core Book?

[MarcusIII]

One of my specific questions is why is it only ever a 6 on 1D per day for an encounter?

I don't think the reason I'm going to give is why the rules are the way they are but here goes: When you jump to a planet you are not exiting at the same place, relative to the planet, that other ships are. The planet is of course always in motion (Earth is moving at 29.8 km/s, or about 66,615 mph) The timing isn't likely the same either. Therefore, the likelihood that your ship's route to the planet is close to that of another ship is remote. The odds of you being within "encounter distance" of any other inbound or outbound ship is close to nil.