Memory Alpha
Memory Alpha

Cepheus was the primary of a planetary system. This was a single star system with a sole planet, Terra 10. The star was located in the Beta Quadrant and was near the gas cloud of the nova Arachna. The nearest starbase was Starbase 23.

Prior to stardate 5577, no radio transmissions were ever produced in this system. In 2269, an intersat code message was transmitted from Terra 10. It was later determined by the USS Enterprise that an Earth expedition had established a colony on the system's only planet. The colony was later evacuated to a new planet, Verdanis. (TAS: "The Terratin Incident")

StarTrek.com located both Cepheus and Arachna in the same sector. [1](X)
The location of this system was inferred from the location of Starbase 23, which had been shown in star charts for Star Trek: Discovery, Star Trek: Picard, and Star Trek: Strange New Worlds to be in the Beta Quadrant.

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