I have discovered space travel and unlocked the first 3 planet, gleba, fulgora and vulcano, but the planet is still locked, im not yet travelled to any off those, and I have istalled other planets mods... but the planet is fully surraunded by unlocked planets and still it doesn't appear like a travelling option

I've noticed it's listed in the unsorted category, not the space category like the other planets in the almanac and there is no ulocking tecnology to it ( feature?).
Thanks for the support