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

Designation Examples Images
Class D Regula, "a few unremarkable ores... a great rock in space" ("Star Trek: The Wrath of Khan")
Planet with ring system (VOY: "Emanations")
Hot, arid, rocky planet (VOY: "Gravity")
Weytahn/Paan Mokar, "uninhabitable" (ENT: "Cease Fire")
Class H Planet with 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 Briori planet, now New Earth, oxygen/argon atmosphere (VOY: "The 37's")
Cold planet, "barely habitable" (DS9: "The Ascent")
"Barely breathable atmosphere" with excess carbon dioxide (DS9: "The Sound of Her Voice")
Planet with atmosphere (ENT: "Bounty")
Class M
Oxygen/nitrogen atmosphere (countless episodes)
Earth (here in TNG: "Conspiracy")
Edo planet (TNG: "Justice")
Lambda Paz, moon of Pentarus III, "barely Class M" (TNG: "Final Mission")
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")


See Also

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



Some screen caps from TrekCore. Data taken from the Star Trek Encyclopedia III and from the Star Trek Archive.


Back to Quick Reference index

View as gallery