|Tau Ceti system|
|Tau Ceti Prime • Tau Ceti III • Tau Ceti IV|
According to Star Trek: Star Charts (p. 44) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Kaferia (Tau Ceti) system was located in the Alpha Quadrant. In the late 24th century, this was a Federation system, with Tau Ceti III listed as a member.
In The Autobiography of Kathryn Janeway, Admiral Janeway's death was described as occurring while piloting a test vehicle that could transition quickly from orbital to suborbital to underwater flight on Tau Ceti Prime because the planet was the closest approximation to Etaris IV, a planet in contention during the Cardassian Wars. (pp. 63-64)