moon, code

A planet’s code is five numbers.  Earth, for instance, is 17-48-87-90-03.  You make the code for a moon by adding a sixth number, found by counting the moons out from the planet.  Earth has only one moon.  Its code is 17-48-87-90-03-01.  The planet Jupiter’s code is 17-48-87-90-05, and its largest moon, Ganymede, is the seventh nearest – 17-48-87-90-05-07.