What I mean by the Anoat system being a planetary system (as opposed to a solar system) is that it’s a system which consists of a planet and its moons. So the Bespin and Anoat planets (and their satellites) both orbit the same star as the Ice Planet, and this entire system is called the Hoth system. However, since they have just left the asteroid field when Leia asks where they are, it may be that the Anoat system was once a planet but this got destroyed and it is now the asteroid field.

And yeah, all this is pretty far from the purview of the filmmakers, but it’s fun to try and fit the pieces into a plausible model instead of the Flash Gordon-y vagueness that it is currently. The only reason I consider that sub lightspeed travel must take a long time is that if it didn’t, Han and company would cross a single solar system within hours at a large fraction of the speed of light, yet their journey would still take years if they had to travel between solar systems. Given that the plot purpose of a long trip to Bespin was so that Luke could have a reasonable amount of time to train with Yoda, the speed of spaceships in Star Wars is then limited based on how long you think it should take to train Luke.