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Planetary classification

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Planetary classification systems were used by many races to categorize planets. Various factors were taken into consideration, including atmospheric composition, surface temperature, vegetation, and size. The classification system used by the Federation used single-letter designations such as class M to describe a planet able to support humanoid life for long periods, while the Vulcans used the term "Minshara class" to describe a similar planet.

Planetary classesEdit

Class Description Examples
Class D Planetoid or moon; little to no atmosphere. Uninhabitable. Regula, Weytahn
Class H Generally uninhabitable. Tau Cygna V
Class J Gas giant Jupiter, Saturn
Class K Adaptable with pressure domes Mudd, Theta VIII, Mars (class K transjovian)
Class L Marginally habitable. No animal life. Only vegetation life. Indri VIII
Class M Terrestrial Earth, Vulcan, Cardassia Prime, Risa, Bajor
Class N Sulfuric Venus
Class T Gas giant
Class Y "Demon" Silver Blood planet, Elba II

Appendices Edit

Background information Edit

The Star Trek: Star Charts book, which was authored and advised by Trek staffers, listed many other planetary classes which may one day be recognized on-screen, but as of now they remain conjectural.

One such was "class F", which was geologically inactive with no atmosphere. Janus VI was given as an example of this.

According to the Star Charts, a class P planet is a "glaciated" planet. They have an age that ranges from three to ten billion years and a diameter between 10,000 to 15,000 kilometers. Class P planets are located in the ecosphere of a star system. A glaciated planet is categorized by a surface comprised of 80%+ water ice and an atmosphere consisting of nitrogen, oxygen, and trace elements. Lifeforms found on class P planets include hardy vegetation, animal life, and occasionally native humanoids. It is widely believed that Breen is also a class P planet. However, according to Weyoun, it was in fact a lush world with a temperate climate, in which case it would have to be categorized as class M. (DS9: "When It Rains...")

Examples of class P planets:

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