A1-C is a large sector with only two incredibly distant planets. Judging by the several massive asteroids orbiting A1-C, there was most likely a third planet close to it that suffered some catastrophic event early in its development. The event could also be responsible for A1-C's abnormal radiation output.
A1-C1 is the first planet orbiting the star A1-C.
Main article: A1-C1
A1-C2 is the second planet orbiting the star A1-C.
Main article: A1-C2