Mariposa was an inhabited planet in the Ficus sector. Classified as M class, this ringed world was settled by Humans from the SS Mariposa in the mid-22nd century. This planet was only half a light year from the Bringloid system. While attempting to land on the surface, the skin of the ship was breached, killing all but five of the colonists. As a result, the Mariposa colony was comprised of numerous clones.
A deleted scene from this episode, available on the TNG Season 2 Blu-ray, referred to this planet as NB2323.