Star Trek Expanded Universe
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Starbase 5 was a United Federation of Planets facility active in the 23rd century.

It was located in the Alpha Quadrant. (DIS: "New Eden"), relatively near Shertag's World. (Orion Press: "The Night Watch")

Lieutenant Christopher Warren transferred to the starbase as an administrative assistant in the late 2240s (or early 2250s). Eventually, he became the starbase's commanding officer with the honorary rank of commodore. (Starfleet Supplemental Communiqué 1:9)

The base was commanded by Captain Diego Vela in the 2250s. In 2257, Lieutenant Spock had himself admitted to its psychiatric facility. ("New Eden")