Talos I was the first planet in the Talosian star system. This small planet orbited the binary stars of Talos at a distance of over one astronomical unit. (TOS: "The Cage", "The Menagerie, Part I")
The Explored Galaxy: The location of Talos
The location of Talos I
Background
The planet was never mentioned in dialog; this name came from a map of the Talosian system.
The Explored Galaxy
This chart was first seen, chronologically, in 2293. (Star Trek VI: The Undiscovered Country) This chart was also seen in several Star Trek: The Next Generation and Star Trek: Deep Space Nine episodes set in the 24th century, from the year 2364 to 2370. These were: TNG: "Conspiracy", "The Measure Of A Man", "The Emissary", "The Mind's Eye", "The Game" and DS9: "In the Hands of the Prophets", "Cardassians".
Star Trek: Star Charts
Talos I was a B-class planet. (page 40)