Planetary classification

All of the planets in the galaxy are assigned a planetary classification by the Federation. This system is used to determine the suitability of the planet for exploration or colonization and is based on several key criteria:


 * atmospheric composition
 * surface temperature
 * vegetation
 * size of planetoid

Each class of planet is assigned a letter in the alphabet based on its suitability. For example, Class M (based on the Vulcan designation Minshara-class) is applied to planets that can support life without any special circumstances, such as Earth. (ST Reference Book: Star Trek: Star Charts).

Planetary Classes

 * Class A
 * Class B
 * Class C
 * Class D
 * Class E
 * Class F
 * Class G
 * Class H
 * Class I
 * Class J
 * Class K
 * Class L
 * Class M
 * Class N
 * Class O
 * Class P
 * Class Q
 * Class S
 * Class T
 * Class Y