Charlotte, a human colony in the Rim Worlds, voted to join the UNP last year. Work has been ongoing ever since to integrate Charlotte into the system. Part of that work has also been New Sparta's presence on the planet.
Charlotte will officially become a full UNP member next year and also be part of NS. An orbital station is already being built and a barracks for an NS Terrestrial Force detachment is being planned. Given Charlotte's strategic position in the Rim Worlds it is likely a permanent ship detachment will be stationed there.