Harry refers to the octopus as number 42 but the credits calls the octopus number 49.
The star plot that Harry draws indicates his home planet likely orbits the star that humanity identifies as 47 Ursae Majoris which is estimated to be 45.9 light years from Earth and has 3 known planets. It is spectral type G1V similar to the Sun, although it is estimated to be about a billion years older and 60% brighter.
In a previous episode Harry says his people are descended from octopuses however in this episode he says they are descended from his people.