Random Dungeons & Dragons Scripts

I love D&D. I've made a bunch of random generators that aren't quite covered with other websites.

Star System Generator

Star System Generator

PLEASE NOTE: The sheer amount of information here makes it impossible to format the system generator for small screens. Please use this on a medium or higher screen for best display results.

I've been involved in star system generation code for quite a while. There was one in particular that offered everything I needed: Aina's Star Generator.

Unfortunately Aina stopped updating the code over twenty years ago and can no longer be reached. He published his code base online back in the day so others could use and improve it.

Here we are in the here and now. I've updated his code to work with php and have made quite a number of modifications. The goal is to make a few tweaks here and there and test out the random generator in a gravity simulator like Universe Sandbox 2 to see just how viable these star systems are.

temperatures: planet temperatures are seriously out of whack. I've left them in until I can figure out the problem.

System Summary

orbit description mass radius ecc inc moons
primaryG0V : Yellow Dwarf (M-S)1.0571 sol2.082 sol
0.252 auDesert0.01984 earth2,175 km0.03 4
0.428 auDesert0.89559 earth7,742 km0.02 4
0.428 auHot House2.16344 earth10,388 km0.03 0
0.899 auHot House7.57203 earth11,470 km0.09 2
1.528 auIce Ball0.88938 earth8,321 km0.02 0
3.208 auIce Ball0.01087 earth3,042 km5.85 29° 1
4.492 auGas Giant3,964.51880 earth127,120 km0.08 8
13.026 auIce Ball0.07098 earth3,130 km0.0 2
41.685 auGas Giant4,468.53381 earth179,550 km0.11 7

Full System Details

Star 1: G0 V Yellow Dwarf (M-S)

Mass 1.0571 sol
Diameter 2.082 sol
Temp 5,986°K (Lux: 1.2487 sol)
Age 3,350.777 Myears (MAX: 8,465.484 Myears)
Orbits min: 0.112 AU
inner max: 0.916 AU
life max: 1.341 AU
max: 42.284 AU

Planet 1 - Inner Zone - Desert - Rocky
Orbit dist: 0.252 AU
period: 6.49 earth days
Ecc: 0.03
Inc: 3°
Body rad: 2174.5 km
mass: 0.020 earth
grav: 0.171 earth
rot: 155.870 hours
tilt:
Temperatures avg: 1,395.386°C
day: 1,412.042°C
night: 1,186.078°C
Water Type: Ice - 10.5%
Atmosphere type: Thin
pres: 0.084 atm
comp: Carbon Dioxide
oxyg: 0
Mineral Resources Metal Ore: 1
Radioactive Ore: 1
Precious Metals: 1
Raw Crystals: 1
Precious Gems: 1

Moons
Moon 0: core: Rocky
orbit: 304430 km
incline: 3°
ecc: 0.03
radius: 1005.5 km
mass: 0.0015695857253175 earth
tilt: 40°
Moon 1: core: Rocky
orbit: 217450 km
incline: 0°
ecc: 0.08
radius: 500 km
mass: 0.00062723775182251 earth
tilt: 39°
Moon 2: core: Rocky
orbit: 43490 km
incline: 5°
ecc: 0.03
radius: 1557.5 km
mass: 0.011666832887534 earth
tilt: 52°
Moon 3: core: Rocky
orbit: 43490 km
incline: 13°
ecc: 0.01
radius: 1214.5 km
mass: 0.006223201900009 earth
tilt: 11°



Planet 2 - Inner Zone - Desert - Rocky
Orbit dist: 0.428 AU
period: 96.71 earth days
Ecc: 0.02
Inc: 5°
Body rad: 7742 km
mass: 0.896 earth
grav: 0.608 earth
rot: 2,321.003 hours
tilt: 20°
Temperatures avg: 1,183.140°C
day: 1,195.915°C
night: 1,005.669°C
Water Type: Ice - 10.5%
Atmosphere type: Thin
pres: 0.286 atm
comp: Carbon Dioxide
oxyg: 0
Mineral Resources Metal Ore: 29.71
Radioactive Ore: 1
Precious Metals: 1
Raw Crystals: 1
Precious Gems: 1

Moons
Moon 0: core: Rocky
orbit: 1393560 km
incline: 4°
ecc: 0.05
radius: 1752.5 km
mass: 0.02077556790354 earth
tilt: 28°
Moon 1: core: Rocky
orbit: 929040 km
incline: 7°
ecc: 0.04
radius: 1685 km
mass: 0.014772994183248 earth
tilt: 15°
Moon 2: core: Rocky
orbit: 1083880 km
incline: 6°
ecc: 0.15
radius: 1563 km
mass: 0.008843150345162 earth
tilt: 24°
Moon 3: core: Rocky
orbit: 108388 km
incline: 2°
ecc: 0.01
radius: 500 km
mass: 0.00062723775182251 earth
tilt: 39°



Planet 3 - Inner Zone - Hot House - Rocky
Orbit dist: 0.428 AU
period: 150.31 earth days
Ecc: 0.03
Inc: 7°
Body rad: 10388 km
mass: 2.163 earth
grav: 0.815 earth
rot: 3,607.396 hours
tilt: 28°
Temperatures avg: 1,562.406°C
day: 1,562.917°C
night: 312.481°C
Water Type: None - %
Atmosphere type: Massive
pres: 80.712 atm
comp: Carbon Dioxide
oxyg: 0
Mineral Resources Metal Ore: 1
Radioactive Ore: 1
Precious Metals: 1
Raw Crystals: 25.988
Precious Gems: 1



Planet 4 - Inner Zone - Hot House - Rocky
Orbit dist: 0.899 AU
period: 855.75 earth days
Ecc: 0.09
Inc: 9°
Body rad: 11470 km
mass: 7.572 earth
grav: 2.340 earth
rot: 20,537.928 hours
tilt: 31°
Temperatures avg: 1,053.345°C
day: 1,053.698°C
night: 210.669°C
Water Type: None - %
Atmosphere type: Massive
pres: 220.005 atm
comp: Carbon Dioxide
oxyg: 0
Mineral Resources Metal Ore: 76
Radioactive Ore: 50.8
Precious Metals: 21.8
Raw Crystals: 37
Precious Gems: 21.8

Moons
Moon 0: core: Rocky
orbit: 1147000 km
incline: 8°
ecc: 0.05
radius: 2499.5 km
mass: 0.036165085640477 earth
tilt: 35°
Moon 1: core: Rocky
orbit: 917600 km
incline: 2°
ecc: 0.05
radius: 500 km
mass: 0.00053073963615751 earth
tilt: 20°



Planet 5 - Outer Zone - Ice Ball - Icy
Orbit dist: 1.528 AU
period: 650.06 earth days
Ecc: 0.02
Inc: 4°
Body rad: 8320.5 km
mass: 0.889 earth
grav: 0.522 earth
rot: 15,601.535 hours
tilt: 35°
Temperatures avg: 710.779°C
day: 717.540°C
night: 604.162°C
Water Type: Ice - 34%
Atmosphere type: Thin
pres: 0.261 atm
comp: Carbon Dioxide
oxyg: 0
Mineral Resources Metal Ore: 23.282
Radioactive Ore: 1
Precious Metals: 1
Raw Crystals: 1
Precious Gems: 1



Planet 6 - Outer Zone - Ice Ball - Icy
Orbit dist: 3.208 AU
period: 218.66 earth days
Ecc: 5.85
Inc: 29°
Body rad: 3042 km
mass: 0.011 earth
grav: 0.048 earth
rot: -3,715.627 hours
tilt: 43°
Temperatures avg: 505.681°C
day: 515.012°C
night: 480.397°C
Water Type: Ice - 41%
Atmosphere type: Vacuum
pres: 0.000 atm
comp: None
oxyg: 0
Mineral Resources Metal Ore: 6.042
Radioactive Ore: 1
Precious Metals: 1
Raw Crystals: 1
Precious Gems: 1
Characteristics Orbital Eccentricity
Tidal Locked

Moons
Moon 0: core: Icy
orbit: 182520 km
incline: 5°
ecc: 0.05
radius: 2775.5 km
mass: 0.041264113898859 earth
tilt: 19°



Planet 7 - Outer Zone - Gas Giant - Icy
Orbit dist: 4.492 AU
period: 218,790.66 earth days
Ecc: 0.08
Inc: 1°
Body rad: 127120 km
mass: 3,964.519 earth
grav: 9.977 earth
rot: 5,250,975.873 hours
tilt: 28°
Temperatures avg: -25.000°C
day: -24.842°C
night: -5.000°C
Water Type: Crystals - 1%
Atmosphere type: Massive
pres: 967.730 atm
comp: Methane/Ammonia/Hydrogen
oxyg: 0
Mineral Resources Metal Ore: 73.8
Radioactive Ore: 45.2
Precious Metals: 20.4
Raw Crystals: 36.6
Precious Gems: 21.8

Moons
Moon 0: core: Icy
orbit: 22881600 km
incline: 3°
ecc: 0.04
radius: 500 km
mass: 0.0001447471734975 earth
tilt: 34°
Moon 1: core: Icy
orbit: 1525440 km
incline: 9°
ecc: 0.01
radius: 500 km
mass: 9.6498115665002E-5 earth
tilt: 29°
Moon 2: core: Icy
orbit: 22881600 km
incline: 0°
ecc: 0.05
radius: 2183 km
mass: 0.024093022251378 earth
tilt: 33°
Moon 3: core: Rocky
orbit: 12712000 km
incline: 4°
ecc: 0.04
radius: 500 km
mass: 0.00053073963615751 earth
tilt: 16°
Moon 4: core: Icy
orbit: 15254400 km
incline: 8°
ecc: 0.03
radius: 500 km
mass: 4.8249057832501E-5 earth
tilt: 38°
Moon 5: core: Icy
orbit: 15254400 km
incline: 1°
ecc: 0.13
radius: 500 km
mass: 0.00019299623133 earth
tilt: 14°
Moon 6: core: Icy
orbit: 1779680 km
incline: 9°
ecc: 0.0
radius: 500 km
mass: 9.6498115665002E-5 earth
tilt: 24°
Moon 7: core: Icy
orbit: 5084800 km
incline: 5°
ecc: 0.02
radius: 500 km
mass: 0.00019299623133 earth
tilt: 20°



Planet 8 - Outer Zone - Ice Ball - Icy
Orbit dist: 13.026 AU
period: 4,572.02 earth days
Ecc: 0.0
Inc: 3°
Body rad: 3129.5 km
mass: 0.071 earth
grav: 0.295 earth
rot: 3.903 hours
tilt: 25°
Temperatures avg: 247.202°C
day: 250.907°C
night: 222.482°C
Water Type: Ice - 50%
Atmosphere type: Very Thin
pres: 0.027 atm
comp: Carbon Dioxide
oxyg: 0
Mineral Resources Metal Ore: 1
Radioactive Ore: 1
Precious Metals: 1
Raw Crystals: 1
Precious Gems: 1
Characteristics Strong Magnetic Field

Moons
Moon 0: core: Icy
orbit: 688490 km
incline: 1°
ecc: 0.12
radius: 1877 km
mass: 0.010210138502253 earth
tilt: 23°
Moon 1: core: Icy
orbit: 43813 km
incline: 21°
ecc: 0.03
radius: 500 km
mass: 0.000289494346995 earth
tilt: 38°



Planet 9 - Outer Zone - Gas Giant - Icy
Orbit dist: 41.685 AU
period: 6,566,561.70 earth days
Ecc: 0.11
Inc: 9°
Body rad: 179550 km
mass: 4,468.534 earth
grav: 5.637 earth
rot: 126,361,943.984 hours
tilt: 44°
Temperatures avg: -25.000°C
day: -24.948°C
night: -5.000°C
Water Type: Crystals - 1%
Atmosphere type: Massive
pres: 574.929 atm
comp: Hydrogen
oxyg: 0
Mineral Resources Metal Ore: 78.4
Radioactive Ore: 48.4
Precious Metals: 21
Raw Crystals: 38.4
Precious Gems: 21.6
Characteristics Tidal Locked

Moons
Moon 0: core: Icy
orbit: 21546000 km
incline: 8°
ecc: 0.07
radius: 3461 km
mass: 0.016002344735378 earth
tilt: 44°
Moon 1: core: Icy
orbit: 17955000 km
incline: 7°
ecc: 0.08
radius: 3385.5 km
mass: 0.089866645116031 earth
tilt: 10°
Moon 2: core: Icy
orbit: 7182000 km
incline: 9°
ecc: 0.03
radius: 500 km
mass: 0.000289494346995 earth
tilt: 20°
Moon 3: core: Icy
orbit: 5386500 km
incline: 2°
ecc: 0.02
radius: 2184.5 km
mass: 0.024142721341909 earth
tilt: 28°
Moon 4: core: Icy
orbit: 2872800 km
incline: 6°
ecc: 0.03
radius: 721.5 km
mass: 0.00028994647029182 earth
tilt: 33°
Moon 5: core: Icy
orbit: 5386500 km
incline: 15°
ecc: 0.13
radius: 2952 km
mass: 0.0099295115122401 earth
tilt: 38°
Moon 6: core: Icy
orbit: 12568500 km
incline: 3°
ecc: 0.13
radius: 2488 km
mass: 0.029723500649144 earth
tilt: 42°