This may be a bit late, your mission is either completed or expired by now.
I am some 200+LY from G 97-54, but according to my map, I haven't fully explored the system.
There are 4 planets that have bases on them, the one you are looking for is the furthers one away.
It's on the landable planet on the bottom left on the map, 28,281.25LS from arrival point.
I've selected the planet in this image: