Starbase 15 is one of the original seventeen Federation starbases provided for in the original Articles of the Federation, and as such was likely constructed in the mid or late 22nd century.

As per the Articles of the Federation section and galactic star chart in Franz Joseph's 'Star Fleet Technical Manual'.

In 2266, Starbase 15 was the closest base to the USS Enterprise when she encountered the telepathic group hive mind labelled "The Winged Dreamers".

(TOS short story: "The Winged Dreamers", from the TOS novel Star Trek: The New Voyages)

The year of her appearance is based on the story's placement in the Trowbridge Timeline.
Community content is available under CC-BY-SA unless otherwise noted.