The as published Mongoose world building rules generate the main world in a system.
WITHOUT looking back at MegaTraveller or other editions, I am interested in expanding the generation process to allow building the entire system, not just what is created in the Main World UWP. Again, this is per Mongoose Traveller (1st or 2nd Edition, they are the same).
So, I am going to use a method that assumes the Referee has already rolled up everything (including Temperture) from the basic UWP rules for his main world and now wants to expand it to fill out the entire planetary system.
I DON'T want to recreate Scouts or First In or World Builders Handbook, the idea is to make something that is reasonably QUICK but also reasonably scientifically sound, based on what we now know about extra-solar planets.
For convenience, I will be using a ZOOM IN approach so that a Referee can as a little detail (equivalent to the Expanded UWP from MegaTraveller) or go all the way and generate UWPs for every planet and moon in the system. (with maybe an intermediate stop in the middle).
Since this is for Traveller, it must be D6 based, although D3 or D66 would be allowed.
First thing, is to expand the UWP CODES to include non-habitable worlds (super-Earths etc.). Here is what I had in mind.
SIZE [Diameter in Miles(Km)]:
0: <1,000 (<1,600)
1: 1,000 - 1,999 (1600 - 3199)
2: 2,000 - 2,999 (3200 - 4799) [Luna, Europa]
3: 3,000 - 3,999 (4800 - 6399) [Mercury, Ganymede]
4: 4,000 - 4,999 (6400 - 7999) [Mars]
5: 5,000 - 5,999 (8000 - 9600)
6: 6,000 - 6,999 (9600 - 11199)
7: 7,000 - 7,999 (11200 - 12799) [Venus]
8: 8,000 - 8,999 (12800 - 14399) [Earth]
9: 9,000 - 9,999 (14400 - 15999)
A: 10,000 - 10,999 (16000 - 17599)
B: 11,000 - 11,999 (17600 - 19199)
C: 12,000 - 12,999 (19200 - 20799)
D: 13,000 - 13,999 (20800 - 22399)
E: 14,000 - 14,999 (22400 - 23999)
F: >15,000 (24000 +) [Solid surface]
G: Gas Dwarf [hypothetical large solid surface with a thick hydrogen/helium atmosphere]
H: Ice Giant [Uranus and Neptune etc.]
J: Gas Giant [Jupiter and Saturn etc. but not a brown dwarf]
0: None (Moon)
1: Trace (Mars)
2: Very Thin Taint
3: Very Thin
4: Thin, Tainted
6: Standard (Earth)
7: Standard, Tainted
9: Dense, Tainted
A: Exotic, Standard
D: Very Dense
E: Thin Exotic
G: Giant (Hydrogen/Helium)
NOTE: Exotic (A) now has a density of Standard or higher, thus Titan is ATM=A adn E is not Thin EXOTIC, not Thin-High which makes no sense and should really just be ATM 2-5 depending if breathable.
Cryonic: 4K - 20K (Interstellar space)
Frigid: 20K - 120K (Outer Solar System)
Frozen: 120K - 220K (Snowline to CO2 Sublimation)
Cold: 221K - 270K (Near Sublimation point of CO2 to Liquid Water)
Temperate: 0C - 30C (271K-300K) - I know this isn't exactly right, but since the REAL scale should be in Kelvin, not Centigrade, I am going to round towards that...)
Hot: 301K - 350K (Temperate to near Boiling Point
Roasting: 351K - 400K (transitions the boiling point of water)
Furnace: 401K - 500K
Infernal: >501K (some metals begin to melt)
NOTE: The break points going Lower in temperature are based on physical things happening to water, going up, it is just a guess...
HYDROGRAPHICS: (Potentially Contriversial...)
0: 0% - 5% (Desert) (Luna, Mercury, Venus, Io)
1: 6% - 15% Liquid (Dry)
2: 16% - 25% Liquid (Small Seas)
3: 26% - 35% Liquid (Small Oceans)
4: 36% - 45% Liquid (Wet)
5: 46% - 55% Liquid (Large Oceans)
6: 56% - 65% Liquid
7: 66% - 75% Liquid (Earthlike)
8: 76% - 85% Liquid (Water world)
9: 86% - 95% Liquid (Small Islands)
A: 96% - 100% Liquid (all water)
B: 6% - 15% Ice
C: 16% - 25% Ice (Mars)
D: 26% - 35% Ice
E: 36% - 45% Ice
F: 46% - 55% Ice
G: 56% - 65% Ice (Ganymede)
H: 66% - 75% Ice
J: 76% -85% Ice
K: 86% - 95% Ice
L: 96% - 100% Ice (Europa)
NOTE: This gets rid of the problem that Traveller has with not being able to track icy worlds which could be used for refueling...
COMMENTS and CRITICISMS are most welcome!
My friends call me Richard. You can call me Sir.www.XmasDragon.com