SciFi world generator system notes.

Last Fall I posted a quickie and general world generation system and noted I had an older one I used for traveller that I was updating to the 21st century. Some of it is here in this post, it's a big old mess of charts and a few notes, it's incomplete but I felt like sharing and wondered if anyone else out there would ever be interested in seeing more?

World Class

RR	Ring
AS	Asteroidean	Under 0.0001 Earth Masses,Small Minor Planet
SD	Sub-Dwarf	Under 0.001 Earth Masses, Large Minor Planet
DD	Dwarf	Between 0.01 and 0.001 Earth Masses
MM	Mercurian	Under 0.1 Earth Masses but over 0.01 Earth Masses
ST	SubTerran	0.1 to 0.5 Earth Masses
TT	Terran	0.5 to 2.0 Earth Masses
XT	SuperTerran	2-10 Earth Masses
CH	Chthonian	2.5-25 Earth Masses
HN	Helian/Neptunian	10-50 Earth Masses
JJ	Jovian	50-200 Earth Masses
XJ	SuperJovian	Over 200 Earth Masses, up to 80 times the mass of Jupiter
BDW	Brown Dwarf	A cool dim near-star

Hot Zone World Table (roll 2d6, 1d6 times)

2	SD - Sub-Dwarf
3	DD - Dwarf
4	MM - Mercurian
5	ST - SubTerran
6	XJ – Super Jovian
7	JJ – Jovian
8-9	TT - Terran
10	XT - SuperTerran
11	CH - Chthonian
12	HN - Helian/Neptunian

Warm Zone World Table (roll 4d6, 1d6-1 times)

4-7	AS - Asteroidean
8-9	SD - Sub-Dwarf
10-11	DD - Dwarf
12-13	MM - Mercurian
14-15	TT - Terran
16-17	JJ –Jovian
18	XJ – Super Jovian
19-20	ST - Terran
21	XT - SuperTerran
22	CH - Chthonian
23	HN - Helian/Neptunian
24	BDW - Brown Dwarf

Cold Zobe World Table (roll 2d6, 2d6-2 times)

3	AS - Asteroidean
4	SD - Sub-Dwarf
5	DD - Dwarf
6	MM - Mercurian
7	TT - Terran
8-10	JJ –Jovian
11-12	HN - Helian/Neptunian
13-14	XJ – Super Jovian
15	ST - SubTerran
16	XT - SuperTerran
17	CH - Chthonian
18	BDW - Brown Dwarf

Determine World Size within a Class

2d6-2, if result is 0 roll 1 d6 on 1-3 go Down A World Class, 4-6 use size 1; on 10 roll 1d6 on1-3 use size 9, 4-6 go up a world class

(Many more charts/tables after the break. I had to trim a bunch just from the selection I'm posting here. )

Asteroidean Atmosphere Density (roll 2d6)

Size Code	Mass	2-10	11	12
1	0.00001	0	0	1
2	0.00002	0	0	1
3	0.00003	0	0	1
4	0.00004	0	1	1
5	0.00005	0	1	1
6	0.00006	0	1	1
7	0.00007	0	1	2
8	0.00008	0	1	2
9	0.00009	0	1	2

Not able to hold stable atmosphere.

Asteroidean Class will Vary from 100 km (or less) to 500 km in diameter

Sub-Dwarf Atmosphere Density (roll 1d6)

Size Code	Mass	Atmosphere Density
		1	2	3	4	5	6
1	0.0001	0	0	0	0	1	2
2	0.0002	0	0	0	1	1	2
3	0.0003	0	0	1	1	2	2
4	0.0004	0	0	1	1	2	3
5	0.0005	0	0	1	1	2	3
6	0.0006	0	0	1	2	2	3
7	0.0007	0	0	1	2	2	3
8	0.0008	0	0	1		3	3
9	0.0009	0	0	1	2	3	3

May only hold substantial atmosphere in the cold zone. +2 to results in cold zone if originally over 1.

Dwarf Atmosphere Density (roll 2d6)

Size Code	Mass	Atmosphere Density
		2	3	4	5	6	7	8	9	10	11	12
1	0.001	0	0	0	0	1	2	2	2	3	3	3
2	0.002	0	0	0	1	2	2	2	3	3	3	3
3	0.003	0	0	1	2	2	2	3	3	3	3	3
4	0.004	0	1	2	2	2	3	3	3	3	3	3
5	0.005	0	1	2	2	2	3	3	3	3	3	4
6	0.006	0	1	2	2	2	3	3	3	3	4	5
7	0.007	0	1	2	2	2	3	3	3	4	4	5
8	0.008	0	1	2	2	2	3	3	3	4	5	5
9	0.009	0	1	2	2	3	3	3	4	4	5	6

Dwarf Worlds will vary in diameter from 1,500 to 2,500 km

May only hold substantial atmosphere in the cold zone. +1 to density rolls in cold zone.

Sub-Terran Atmosphere Density (Roll 2d6)

Size Code	Mass	Atmosphere Density
		2	3	4	5	6	7	8	9	10	11	12
1	0.1	0	1	2	2	3	3	3	4	5	6	7
2	0.15	0	1	2	2	3	3	4	5	6	7	8
3	0.2	0	1	2	3	3	3	4	5	6	7	8
4	0.25	0	1	2	3	3	3	4	5	6	7	8
5	0.3	0	1	2	3	3	4	5	6	7	8	9
6	0.35	0	1	2	3	3	4	5	6	7	8	9
7	0.4	0	1	2	3	4	5	6	7	8	9	A
8	0.45	0	1	2	3	4	5	6	7	8	9	A
9	0.5	0	1	2	3	4	5	6	7	8	9	A

May hold atmosphere in outer reaches of warm zone and further out. -2 to density rolls in hotzone.

Sub-Terran worlds will vary in in diameter from 5,000km to 10,000km.

Terran Atmosphere Density (roll 2d6)

Size Code	Mass	Atmosphere Density
		2	3	4	5	6	7	8	9	10	11	12
1	0.5	0	1	2	3	4	5	5	5	6	6	7
2	0.625	1	2	3	4	5	5	6	6	7	7	8
3	0.75	2	3	4	5	6	6	6	6	7	8	8
4	0.875	3	4	5	5	6	6	6	6	7	8	9
5	1.0	3	4	5	5	6	6	6	7	7	8	9
6	1.25	4	4	5	6	6	6	7	7	8	8	9
7	1.5	4	5	5	6	6	6	7	7	8	9	9
8	1.75	4	5	6	6	6	6	7	7	8	9	A
9	2.0	4	5	6	6	7	7	7	8	8	9	A

Can hold significant atmosphere with water. Terran worlds with density 0-2 atmospheres likely underwent horrible cosmic tragedies, are very close to their sun, or are moons to much more massive worlds.

Terran worlds will  be 8,000 km to 12,000 km in diameter.

Super-Terran Atmosphere Density (roll 2d6)

Size Code	Mass	Atmosphere Density
		2	3	4	5	6	7	8	9	10	11	12
1	2	4	5	6	7	8	8	8	8	8	9	A
2	3	4	2	7	8	9	9	9	A	A	A	A
3	4	6	7	8	9	9	9	A	A	A	A	B
4	5	7	8	9	9	9	A	A	A	A	B	9
5	6	7	8	9	9	9	A	A	A	A	B	9
6	7	7	8	9	9	9	A	A	A	A	B	9
7	8	7	8	9	9	9	A	A	A	A	B	C
8	9	7	8	9	9	9	A	A	A	A	B	C
9	10	8	9	9	9	A	A	A	A	B	C	D

Can have dense atmosphere with liquid water in warm zone.

Super-Terran worlds will range from 12,500 to 20,000 km in diameter.

Chthonian Atmosphere Density (roll 2d6)

Size Code	Mass	Diameter	Atmosphere Density
			2	3	4	5	6	7	8	9	10	11	12
1	6	8,000	0	1	1	2	3	3	4	D	D	D	D
2	12		0	1	1	2	3	3	4	D	D	D	D
3	18		0	1	1	2	3	3	4	D	D	D	D
4	24		0	1	1	2	3	3	4	C	D	D	D
5	30	24,000	0	1	1	2	3	3	4	C	D	D	D
6	36		0	1	1	2	3	3	4	C	D	D	D
7	42		0	1	2	3	3	3	4	C	C	D	D
8	48		0	1	2	3	3	3	4	B	C	D	D
9	54	40,000	0	1	2	3	3	3	4	B	C	D	D

Not likely to have much atmosphere as it is a failed giant stripped of much of its atmosphere.

Chthonian Worlds will vary from 8,000 to 40,000 km in diameter.

Jovian Atmosphere Density (roll 1d6)

Size Code	Mass	1	2	3	4	5	6
1	60	8	9	9	A	A	A
2	90	8	9	9	A	A	A
3	120	8	9	9	A	A	A
4	170	8	9	9	A	A	A
5	210	8	9	A	A	A	A
6	250	8	9	A	A	A	A
7	285	8	9	A	A	A	A
8	325	8	9	A	A	A	A
9	360	8	A	A	A	A	A

Can have superdense atmosphere in hot zone.

Jovian worlds will range from 45,000 to 140,000 km in diameter.

Atmospheric Composition for Sub-Terran to Super-Terran Worlds

Atmos Density	2	3	4	5	6	7	8	9	10	11	12
1	1	1	1	2	2	A	A	A	A	A	C
2	1	1	1	2	2	A	A	A	B	B	C
3	1	1	2	3	3	4	A	A	B	B	C
4	1	2	3	4	5	6	8	A	A	B	C
5	1	2	3	4	5	5	6	8	A	B	C
6	1	2	3	4	5	5	5	6	7	A	C
7	1	2	3	4	5	5	6	7	8	A	C
8	1	2	3	4	5	5	6	7	8	B	C
9	1	2	3	4	5	6	7	8	9	B	D
A	1	2	3	4	5	6	7	8	9	B	D
B	1	2	3	4	5	6	7	8	9	B	D
C	1	2	3	4	5	7	8	9	A	B	D
D	1	2	3	4	5	7	9	A	B	C	D

Atmosphere Composition of Chthonian Worlds

Atmos Density	2	3	4	5	6	7	8	9	10	11	12
1	1	1	1	A	A	A	A	A	B	B	C
2	1	1	1	1	A	A	A	B	C	D	D
3	2	4	1	1	1	A	B	B	C	D	D
4	4	3	2	1	1	A	B	C	C	D	D
B	4	3	2	1	1	A	C	C	D	D	D
C	3	4	2	1	1	A	C	D	D	D	D
D	2	1	1	1	1	A	D	D	D	D	D

Jovian and Super-Jovian Atmosphere Composition and Temperature

Zone and Atmos Density	2	3	4	5	6	7	8	9	10	11	12
Hot,8	A	B	C	D	E	E	F	F	G	G	G
Hot,9	B	C	D	E	E	F	F	G	G	G	G
Hot,A	C	D	E	F	F	G	G	G	G	G	G
Warm,8	6	7	8	9	A	B	C	D	E	F	G
Warm,9	7	8	9	A	B	C	D	E	F	F	G
Warm,A	8	9	A	A	B	C	D	E	F	G	G
Cold,8	3	2	1	0	0	0	0	0	8	B	D
Cold,9	4	3	2	1	0	0	0	0	9	C	E
Cold,A	4	3	2	1	1	0	0	0	A	D	F

If size 7+ Hot Jovian add 2 to roll, If  size 6+ Hot Super-Jovian add 3 to roll

Asteroidean Composition (roll 3d6 an check as per zone)

Hot Zone	Warm Zone	Cold Zone	Code	Majority of composition
3-4	3-4	3	R	Rubble- mixed materials in very close proximity or bound by forces of collision.
5-7	5-6	4-5	M	Metal- Hot zone
8-13	7-12	6-7	S	Silicate- warm zone
14-16	13-15	8-12	C	Carbon- cold zone
17	16	13-15	W	Water Ice
18	17-18	16-18	I	Ices (frozen gases other than water)

Roll 2d6-2 for Value code of Asteroidean Bodies.

Asteroidean Value code indicated general relative worth of Asteroidean body for economic exploitation.

Asteroidean Value (2d6-2)

Code	Access	Quality	Demand	Reserve
0	Hazardous	Low	Low	Low
1	Hazardous	Moderate	Moderate	Moderate
2	Hazardous	High	High	High
3	Difficult	Low-Moderate	Low	Low
4	Difficult	High	Moderate-High	Moderate-High
5	Moderate	Low	Low	Low-Moderate
6	Moderate	Moderate	Moderate	High
7	Moderate	High	High	Hgh
8	Unrestricted	Low	Low	Low
9	Unrestricted	Moderate	Moderate	Moderate
A	Unrestricted	High	High	High

If a ref wishes they can create asteroids with variance in notes for Access, Quality, Demand, and Reserve.  Codes in each column are maximal for each code so by example an Asteroid with Unrestricted Access Low Quality, High Demand, and Moderate reserve would have a Asteroidean Value Code of 8 as Access is Unrestricted and quality is Low.

Note: If Radiation Level is B or C Access will be downgraded and best code for Asteroid Value is 7.

If Radiation Level is D+ Access will be Hazardous ar best resulting in best code for Asteroid Value of 2.

Atmosphere Density/Pressure

0	Vacuum	Vacc Suit
1	Transient	Vacc Suit
2	Trace	Vacc Suit
3	Very Thin	Respirator
4	Breathable at low altitude only
5	Thin
6	Terrestrial
7	Dense
8	Very Dense
9	Crushing	Unbreathable by humans
A	Super Dense	Unbreathable by humans
B	Unusual, Breathable at high altitude only
C	Unusual, Breathable at poles or equator only
D	Unusual, Pressure fluctuates dangerously

Atmosphere Composition

0	Vacuum
1	Inert- unbreathable mixture of inert gases.
2	Very Hypoxic- far too low to breathe for non-native life forms
3	Hypoxic- low oxygen content, breathable to humans but may cause hypoxia over extended periods or intense physical activity.
4	Hypoxic, Tainted
5	Normoxic- moderate oxygen content, breathable to humans.
6	Normoxic, Tainted
7	Hyperoxic- high oxygen content, breathable to humans but may cause hyperoxia over extended exposure or intense physical activity.
8	Hyperoxic, tainted
9	Extremely Hyperoxic- toxic level of oxygen in atmosphere.
A	Exotic- an unbreathable mix of gases that doesn’t qualify for the other ratings given here.
B	Volatile – not normally corrosive in the short term but may react violently (flammable or explosive) in contact with water or oxygen. Flames may ignite explosively.
C	Corrosive- humans suffer immediate damage over the short term.
D	Insidious- as corrosive but will eventually defeat equipment as well. Equipment will typically fail in hours.

Determine Hydrology Class

Hydrology class determines the basic chemistry of the hydrographic presence of a world.

Roll 3 dice on triples check On Hydrology Class Table II otherwise use Hydrology Class Table I

Hydrology Class Table I

Temperature + Atmos. Density	2	3	4	5	6	7	8-9	10-12
1-3	1	1	1	2	2	3	3	4
4-6	1	2	2	4	4	7	7	8
7-9	2	2	4	7	7	6	8	9
10-12	3	7	7	6	6	8	9	A
13-15	7	6	5	8	A	A	A	A
16-18	5	5	A	A	A	A	A	A
19+	B	5	A	A	A	A	A	A

Hydrology Class Table II

Die roll	Hydrology Class
2	1
3	2
4	3
5	4
6	5
7	A
8	9
9	8
10	7
11	6
12	B

For atmosphere compositions of 3,5 or 7 shift to 4,6, or 8 respectively if hydrology differs from Water. On a world with Atmos. Densities 0-2 and temperature A or higher there will be no water on a world in hot zone of Terran-Class or smaller as such they will be Hydrology Class 0

Hydrology Class Code Definition

0-     Dry

1-     Condensed Atmosphere

2-     Hydrocarbon

3-     Methane/Ethane

4-     Methane

5-     Sulphur

6-     Chlorine

7-     Ammonia

8-     Ammonia/Water

9-     Water/Ammonia

A-     Water

B-     Phosphorus

Hydrographic Occurrence

2d6-2 Warm and Cold Zone Worlds

3d6-12 Hot Zone Worlds

Temperature- will be tied to world type and zone

	Degrees C	Gas Giant Upper Deck	Note
0	0 to -200	Methane
1	-200 to -150	Ammonia
2	-150 to -100	Ammonia
3	-100 to -50	Amonia/Water
4	-50 to 0	Water	Psychrothermal
5	0 to 25	Water	Cool-Mesothermal
6	26 to 50	Water	Warm-Mesothermal
7	50 to 100	Water/Sulfur	Thermoplanet
8	100 to 150	Water/Sulfur	Hyper-Thermoplamet
9	150 to 200	Sulfur
A	200 to 400	Sulfur
B	400 to 600	Cloudless	Lava
C	600 to 800	Cloudless	Lava
D	900 to 1000	Alkali	Lava
E	1000 to 1500	Alkali/Ferro-Sillicate	Lava
F	1500 to 2000	Ferro-sillicate	Lava, Precious metals would be liquids.
G	Over 2000	Carbon	Lava, Precious metals would be liquids.

Radiation Levels

Rad Level
0	negligible
1	Chest x-Ray
2	terrestrial background exposure
3	Abdominal X-Ray, High altitude terrestrial expo.
4	Uranium miner annual exposure limit
5	Low Cancer Rate in Humans
6	Mild Radiation Sickness
7	Light Radiation Poisoning
8	Moderate Radiation Poisoning
9	Severe Radiation Poising
A	Acute Radiation Poisoning
B	Near Instant Terminal Radiation Exposure Data Loss possible
C	Data Loss Likely
D	Equipment Damage Likely
E	Catastrophic Data Loss Likely
F	Catastrophic Equipment Damage Likely

Terran Radiation Levels

Atmos. Density	2	3	4	5	6	7	8	9	10	11	12
0	1	2	2	3	3	4	4	5	6	7	8
1	1	2	2	3	3	4	4	5	6	7	7
2	1	2	2	3	3	4	4	5	6	6	7
3	1	2	2	3	3	3	4	4	5	6	6
4	0	1	2	2	3	3	3	4	4	5	6
5	0	1	1	2	3	3	3	4	4	5	6
6	0	1	1	2	3	3	3	3	4	5	6
7	0	0	1	2	3	3	3	3	4	5	6
8	0	0	1	2	2	3	3	3	4	5	6
9	0	0	0	1	2	3	3	3	4	5	6
A+	0	0	0	1	2	3	3	3	3	4	5

If in Hot Zone add 1 results (not die roll), if in Cold Zone subtract 2 from results (not die roll)

If moon of Jovian or Super Jovian raise radiation level to that of parent if atoms. density of moon is 7 or less, raise by 1 otherwise if parent has higher radiation level from that rolled here.

More notes: The basics of the planet aren't done yet. There's some biosphere codes and civilization codes that have to be worked up too.