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Planet Classification

This list is rather short, as it is comprised only of planet classifications mentioned on screen. The system has been consistently supplemented in the book Star Trek Star Charts by Geoffrey Mandel, but its canonicity is debatable.


List of Canon Planet Classes

Class D
Name: Regula, "a few unremarkable ores... a great rock in space" ("Star Trek: The Wrath of Khan")
VOY: "Emanations"
Hot, arid, rocky (VOY: "Gravity")
Name: Weytahn/Paan Mokar, "uninhabitable" (ENT: "Cease Fire")
Class H
Oxygen/argon atmosphere (VOY: "Scorpion, Part II")
Class J 
Gas giant (DS9: "Starship Down")
Class K 
Adaptable for humanoid life with pressure domes (TOS: "I, Mudd")
Class L 
Name: Briori planet, now New Earth, oxygen/argon atmosphere (VOY: "The 37's")
Cold, "barely habitable" (DS9: "The Ascent")
"Barely breathable atmosphere" with excess carbon dioxide (DS9: "The Sound of Her Voice")
Breathable atmosphere (ENT: "Bounty")
Class M
Oxygen/nitrogen atmosphere (countless episodes)
Vulcan designation: Minshara Class (ENT: "Strange New World")
Class Y
Class nickname: Demon Class, toxic atmosphere with thermionic radiation; surface temperatures over 500K (VOY: "Demon")
"Toxic atmosphere, sulphuric deserts, no trees, no life at all" (VOY: "Flesh and Blood")
Class 9
Pre-Federation classification. Out of the four gas giants in the Sol system, none are Class 9. Klingon designation: K'Tal Class (ENT: "Sleeping Dogs")


More about Planets

Planet Mutations - recurring planets whose appearance varies

Planets in TOS and TOS Remastered - Part 1, Part 2, Part 3 - survey of the TOS planet models and how they were remastered

Re-Used Planets in TNG - all the planets that appeared from twice up to eleven times

Re-Used Planets in DS9 - all the planets that appeared from twice up to six times



Data taken from the Star Trek Encyclopedia III and from the Star Trek Archive.


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Last modified: 27.10.14