Although you said there is not much literature around the subject, did you find anything? This has always been one of my favorite aspects of The Elder's Scrolls and, of course, Tolkien.
https://youtu.be/J5xU-8Kb63Y How to build a classical solar system
Although reading reference books like this can be a bit dry, it helps you recognize the elements that an author makes up for his or her world when you see them.