Synnax
The birthplace of Gaal Dornick, it was in a stellar system orbiting a region called the 'Blue Drift', which is on the Trailing Arm of the Galaxy. Travel to Trantor is expensive, thanks to its relative position to the Galactic black hole. In this way it is similar to Hari Seldon's home world of Helicon. Synnax's system contains an asteroid field, as well as a set of gas giants.
Read more about this topic: List Of Foundation Universe Planets