The planet was contacted and colonized before the Prime Directive, so the native culture of Athena is a modern Federation world, except for archeology (still an exciting science on Athena) and some cranky hold outs, deep in the jungle.
Athena stands in for Venus of the Pulp Age. If Heinlein or Burroughs sends someone to a warm, wet, jungle-world Venus, I mentally substitute Athena. It's can't be too far away from Earth since there was travel there in the old days when Warp Drives were new, men were men, women were women and small furry creatures from Alpha Centauri were small furry creatures from Alpha Centauri.
See Omicron Ares