Hansen's Planet was a Class M planet that had previously been explored by Federation anthropologists by 2267.
Hansen's Planet was home to a species of anthropoids similar to the ones found on Taurus II. Lieutenant Kelowitz was aware of the anthropological lifeforms found on Hansen's Planet and noted their similarities in his report to Captain James T. Kirk following a violent encounter on Taurus II. (TOS: "The Galileo Seven")
Hansen's Planet is in close proximity to the Veridian system. (Star Trek Generations)
(Hansen's Planet can be seen in noted in the stellar cartography display as Picard and Data track the path of the Nexus ribbon.)