As Mariposa was the name of both the ship and the final destination planet, it is not clear which was named after the other. The captain of the ship was stated to be one of the colonists to the planet Mariposa.
The SOS was used by the European Hegemony. It is possible that only the Irish colonists were affiliated with this alliance.
There is a discrepancy between dialog and the okudagram, an alternate legible version of which has appeared in Star Trek: The Next Generation - The Continuing Mission (page 85). Picard orders up a list of all "Earth deep-space launches from 2123 to 2190 with the destination in or near the Ficus sector" and sees no launches to Ficus. The okudagram, in contradiction, reads seven launches to Ficus sector from that time period. Even the Mariposa is listed as one of two colony ships. An additional discrepancy is that the dialog consistently describes a span of over three hundred years, putting the episode in the mid to late 25th century (2400s), rather than the canon-established 2365.