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Io was a moon in orbit of the planet Jupiter, the fifth planet of the Sol system, located in Sector 001 of the galaxy's Alpha and Beta Quadrants. (ST reference: Star Charts)


Like the innermost large moon of Cherela, the tidal forces of the Jovian's gravity kneaded the moon's crust, turning Io into a volcanic hell. The intense magnetosphere conducted with the erupting gases, creating a plasma torus which the moon then plowed through. (TOS novel: The Face of the Unknown)


In 2270, the innermost large moon of Cherela, the elected homeworld of the First Federation's Web of Worlds, was reminiscent of Io. (TOS novel: The Face of the Unknown)

In 2369, the USS Progress was reassigned to the Earth-Io run. (SCE - What's Past eBook: Progress)

In 2379, the Luna-class starship USS Io was named for the Jovian moon. (TTN novel: Sword of Damocles appendix)

Kelvin timeline[]

In the Kelvin timeline, Section 31 constructed the USS Vengeance in the Io Facility in orbit of the moon between 2258 and 2259. Lieutenant Commander Montgomery Scott infiltrated the drydock shortly before the launch of the Vengeance. He had learned the coordinates indirectly from Khan Noonien Singh. (TOS movie: Star Trek Into Darkness)

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