Gas Giant Classification

Gas Giants are not included in the earth-like world classification scheme due to the different criteria used to divide them in classes.
Gas giants are divided by size and temperature. Both characteristics being expressed as prefixes to the word Jovian. If no prefix is present the gas giant in question is assumed to be similar in size and temperature to Jupiter in Sol.
In order for a world to be classed using this scheme it must be composed primarily of gasseous materials. Gas giants that lost most of their atmosphere, leaving only a solid core, are considered rocky worlds.

Temperature prefixes

  • Hyperthermal: Giants with a surface temperature above 1400 K, generally very close to their parent star
  • Epistellar: Giants with a temperature between 800 K and 1400 K
  • Azuri: Giants with a temperature between 350 K and 800 K, generally blue in colour
  • Hydro: Giants with a temperature suitable for primarily water vapour clouds
  • Typi: Giants with a Jupiter-like temperature with clouds consisting primarily of ammonia
  • Cryo: Giants too cold for even ammonia clouds, generally completely cloudless and monochrome.

Size prefixes

  • Sub: Giants of up to 0.2 Jupiter masses.
  • Meso: Giants between 0.2 and 8.0 Jupiter masses
  • Super: Giants between 8.0 and 13.0 Jupiter masses, larger worlds are classed as brown dwarfs.