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The last of my updates/retcons of the stub system articles in relation to the Nepleslian Reds. This one took more time since there is a lot more going for this system in comparison to the industrial systems of Fujiko and Rufusland.
With this in mind, I think colonization of the Ukmirt system probably occurred after planets like Nataria. I think the first time Yamataians/Nepleslians set foot on Ukmirt's world was probably during the First Mishhuvurthyar War. Specifically, since its neighbor, the Fujiko system, was discovered in YE 28 by the YSS Sakura that's probably when it was sort of put on the map and after the defeat of the Mishhuvurthyar in YE 30, that's probably when human(oids) started moving in.