OK - a question for you.
Why is Polaris constantly in line-of-sight from practically the entire northern hemisphere of Earth? Not just the North Pole?
The upshot is that if you stand at latitude x° north, then all stars within x° if the north pole star are permanently within line-of-sight.
I'd be using this characteristic to guide the search and narrowing down the range of surface area on each candidate planet/moon.
Cheerz
Mark H
I believe this answers your question, https://youtu.be/TeMooNFtFJk