Eridios was a planet.

In 2257, Christopher Pike, in command of the USS Enterprise, had the planet's surface destroyed in an effort to prevent space-time from disintegrating. The incident led to the creation of General Order 24. (Last Unicorn RPG module: All Our Yesterdays: The Time Travel Sourcebook)

planets visited by the USS Enterprise (NCC-1701) (2243-2264)
Robert April's command (2243-2251) EarthRomulan planetoidTarsus IVFaramond
Christopher Pike's command (2251-2264) EarthGS391AretaMagefferus IIIPharos siteworldRigel VIITalos IVDarien 224PrairieNeyda PrimeLiriaJubalTheta KalybAlgol IITemaziCorinthia VIIEridios
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