From Bravo Fleet Infobase
Built just outside the Sinelan star system, Starbase 440 is a Regulus class base with three capital ships attached. The primary purpose of SB440 is to provide the Sinelans the protection and support they agreed to with the protectorate status. The starships assigned to the base also serve to patrol and protect trading lines, be it for the Sinelans or other Federation trade vessels still operating in the region. While the Federation can't interfere with Sinelan politics, mainly the rampant crime on the planet, SB440 can arrest any Sinelans that interfere with Starfleet operations or a criminal act outside of Sinela an in Federation space.