All testlab machines orbit around the gateway box, Jupiter. When I setup the first testlab in May, Jupiter had only 63 moons. Now Jupiter has 64 moons (mostly captured asteriods), so I would hope that would be enough names to use.
Power management is provided via Sol.
Io provides a subnet to the subnet
Ganymede, Callisto, Io, and Europa
Metis, Adrastea, Amalthea, and Thebe.