If you start a new game, then go to "Custom Game", then choose "Star System", no matter where you start with "Star System", on a planet, or on a moon, or in space, all the asteroids will be in the same place with the same ore(s) every time.

... required Star System

which value exactly has to be 0?
Because if I take it over, it would have to fit on my mod server too, right? that would then quasi load the same positions ... thought about it correctly?

The reason is because the games uses a seed of "0" to spawn the asteroids. Since the seed never changes, the asteroids always spawn the same ores at the same locations.

all added, thank you, its helpfull for vanilla server, greatefully

hm o.O

If you play "Star System" where the planets are already placed by the game (in other words, you don't spawn in Mars or Alien or any of the other planets or moons and place them somewhere randomly), then the asteroids I've identified will always be in the same place. Always.

is the spawn of a asteroid alltime same? i think ever the spawn is random`?

Far from it. Just a guy trying to be helpful. But I'm glad you like it.

you are a god