-Removed-My degree is in Maths, and my career is programing, so if I am a scientist is it more in spirit than education or career. I have looked up the figures and I think you are correct. I pulled the 6 mins figure out of my memory.
I calculate 4 light years as being about 2 million AU.
I calculate the radius of the largest star at about 3.38 light days. The nearest star is about 430 times that distance.