The Denobula Triaxa System was added along with the sector space revamp of Season 10. It can currently not be visited and merely serves as an aesthetic asset. It is also not specified whether Denobula is a Federation member.
Star Trek Online places the system in the same location, where Iota Boötis would be located in a Galactic planview projection. This seems to be a nod to most soft canon sources, which consistently equate the Denobula Triaxa and Iota Boötis systems.
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