Tyrellia
- Class D
- One of four known inhabited planets with no magnetic pole (TNG: "Starship Mine")
- One of seven known inhabited planets with no atmosphere (TNG: "Starship Mine")
- Assumedly meant discounting asteroid colonies and the like
- Likely formerly with an atmosphere
- Lack of atmosphere likely related to lack of magnetic pole; stripped by solar wind perhaps
- Inhabitants: Tyrellian
- Nation
- - 2369 - Present: United Federation of Planets (TNG: "Starship Mine")