Pretty much what DED said, with these elaborations:
- Breathable atmospheres will only be on planets of size 5+ in the habitable zone.
- Planets orbiting M V and late K V stars in the Habitable Zone will be tidelocked to the star.
- Replace D companions that aren't in Far orbits with Hot Jupiters (if in a Close orbit), or Brown Dwarfs (not too many though, since they don't seem that common in planetary systems), or replace them with M V stars.
You can use the GDW 2300AD system if you have that, it's not too bad but see the caveats and fixes at [2300AD] The GDW 2300AD Worldbuilding system: Part 1 - Investigation http://evildrganymede.net/2014/01/17/gdw-2300ad-worldbuilding-system-part-1/
http://evildrganymede.net/2014/01/17/gdw-2300ad-worldbuilding-system-part-1/
[2300AD] The GDW 2300AD Worldbuilding system: Part 1... http://evildrganymede.net/2014/01/17/gdw-2300ad-worldbuilding-system-part-1/ In which I examine and discuss the star and world generation system from the original GDW 2300AD rules!
View on evildrganymede.net http://evildrganymede.net/2014/01/17/gdw-2300ad-worldbuilding-system-part-1/
Preview by Yahoo
and at [2300AD] The GDW 2300AD Worldbuilding system: Part 2 â Realistic Version http://evildrganymede.net/2014/02/01/gdw-2300ad-worldbuilding-system-part-2/
http://evildrganymede.net/2014/02/01/gdw-2300ad-worldbuilding-system-part-2/
[2300AD] The GDW 2300AD Worldbuilding system: Part 2... http://evildrganymede.net/2014/02/01/gdw-2300ad-worldbuilding-system-part-2/ In which I present some fixes to make the GDW 2300AD star and world generation system more realistic!
View on evildrganymede.net http://evildrganymede.net/2014/02/01/gdw-2300ad-worldbuilding-system-part-2/
Preview by Yahoo
- Breathable atmospheres will only be on planets of size 5+ in the habitable zone.
- Planets orbiting M V and late K V stars in the Habitable Zone will be tidelocked to the star.
- Replace D companions that aren't in Far orbits with Hot Jupiters (if in a Close orbit), or Brown Dwarfs (not too many though, since they don't seem that common in planetary systems), or replace them with M V stars.
You can use the GDW 2300AD system if you have that, it's not too bad but see the caveats and fixes at [2300AD] The GDW 2300AD Worldbuilding system: Part 1 - Investigation http://evildrganymede.net/2014/01/17/gdw-2300ad-worldbuilding-system-part-1/
http://evildrganymede.net/2014/01/17/gdw-2300ad-worldbuilding-system-part-1/
[2300AD] The GDW 2300AD Worldbuilding system: Part 1... http://evildrganymede.net/2014/01/17/gdw-2300ad-worldbuilding-system-part-1/ In which I examine and discuss the star and world generation system from the original GDW 2300AD rules!
View on evildrganymede.net http://evildrganymede.net/2014/01/17/gdw-2300ad-worldbuilding-system-part-1/
Preview by Yahoo
and at [2300AD] The GDW 2300AD Worldbuilding system: Part 2 â Realistic Version http://evildrganymede.net/2014/02/01/gdw-2300ad-worldbuilding-system-part-2/
http://evildrganymede.net/2014/02/01/gdw-2300ad-worldbuilding-system-part-2/
[2300AD] The GDW 2300AD Worldbuilding system: Part 2... http://evildrganymede.net/2014/02/01/gdw-2300ad-worldbuilding-system-part-2/ In which I present some fixes to make the GDW 2300AD star and world generation system more realistic!
View on evildrganymede.net http://evildrganymede.net/2014/02/01/gdw-2300ad-worldbuilding-system-part-2/
Preview by Yahoo