The result being 29541.266m, or ~29.54km, not 6 km. My guess would be to round it up to 30 km.
Note: There's also a lot of problems in ALL solars throughout the game, where the diameter, escape velocity and mass aren't correct. I plan on working on them later, but don't worry, I won't post one for each, I'll make sure to DM or whatever since it's on infocard and doesn't have gameplay consequences (not really, some could have I guess?) and coordinate with staff if needed/wished.
Do not repeat this template for unrelated bugs, each needs their own thread.