Planet Randomization Control and Stats

Anonymous's picture
October 5, 2007 - 1:08am
Refer to: Planet / System Generator - d100 Project Outline.

Here are the categories I think pertinent. This will be a simplified system for determining each type of planet without having to roll each and every detail. First you roll or choose the type of planet from the Orbital Body Type Table. Then you roll just a few stats: Size, Gravity, Water, Atmosphere, and Satellites. For Satellites you again roll on the Orbital Body Type Table and then roll for Size, Gravity, and Atmosphere. The Atmosphere Table receives a Solar Radiation modifier from the Star Table, a Gravitational modifier from the Gravity Table, and a Humidity modifier from the Water stat on the Size table. Gravity receives a Gravitational Modifier from the Star (or Gravity) Table and a Mass modifier from the Size Table. These modifiers apply to specific stats on the tables. Gravity and Atmosphere also provide direct modifiers to character stats and vehicles on that planet. You can either roll on the tables or you can select the options to match your vision of the planet you have in mind.


Star Type
Blue Dwarf
Yellow Dwarf
Red Dwarf
Blue Giant
Yellow Giant
Red Giant
White Dwarf
=Solar Radiation modifier
=Gravitational Modifier

Number of Planets
1d10 +1

Orbital Body Type
Jovian (Gas Giant)
Asteroid Belt

Comet Types (roll 1d10 for number of comets)
(More research needed)


Surface Area
% Surface Water (=Humidity modifier)
=Mass modifier

(apply Mass modifier and Gravitational modifier)
Orbital Distance
Orbital Velocity
=Gravitational modifier (to ships, moons, and atmosphere)

(apply Solar Radiation modifier, Gravitaional modifier, and Humidity modifier)
Air Pressure
Avg Humidity
Atmospheric Compositition
Min Polar Temperature
Avg Inhabitable Zone Temperature
Max Equitorial Temperature

Number of Moons (roll 1d10 -2)
Moons (Roll on Orbital Body Type)
Orbital Debris (Rings)

*An ice planet does not mean a frigid wasteland, but means near absolute zero. Only ice planets can orbit ice planets and ice planets can only be found on the outer edge of the solar system.

This can help provide the science and realism for games and articles while retaining playability as well as the Star Frontiers feel.

Anonymous's picture
w00t (not verified)
December 14, 2007 - 2:00pm
What types of objects are in a system?

Obviously the star. Here is my list :
  1. comets
  2. asteroid belts
  3. terrestrial planets
  4. jovian
  5. minor-planets
  6. ?

jaguar451's picture
December 26, 2007 - 9:47am
FWIW, a random Google Knight Hawks related search came up with the below, in case anything of interest...

Anonymous's picture
w00t (not verified)
December 26, 2007 - 10:49am
ty Jag, I seen that and use it for reference.


this project is taking awhile BUT I'm learning a ton of stellar stuff.

Anonymous's picture
w00t (not verified)
January 16, 2008 - 7:39pm
Is anyone for the idea of a Bespin like gas giant where the outer layer of the atmosphere is habitable or is this stretching it for SF?

Gilbert's picture
January 16, 2008 - 7:45pm
  I wouldn't think it is stretching it to far. It would probably be extremely rare to find one. The idea of it happening could happen in reality.

Gergmaster's picture
January 18, 2008 - 7:02am
Hey guys you should probably work on cutting the fluff. Not every GM wants to know the diameter, mass, and axis of a planet. They can make that stuff up as they go. If this is supposed to be simple cut out that and put it as optional material. This makes it easier for a GM to generate a star system he can use in his module, campaign, or whatevere else without having all of the useless information to a game.
Confucious Says:
     Man with one chopstick go hungry.
     Man who eat many prunes get good run for money.
     Man who live in glass house should change clothes in basement.