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0002,Nunki 2 2,6366,59%,0.59,3755.94,Honor,-23,-19
0005,Nunki 2 5,2615,24%,0.24,627.6,Bananiel,-44,-47
...
0018,Rigel 2 6,4160,59%,0.59,2454.4,Khouri,-49,75
0019,Rigel 2 7,5801,18%,0.18,1044.18,ThrevenGuard,-69,103
0023,Fornacis 2 4,5483,52%,0.52,2851.16,unoccupied

use warnings;
use strict;
...
sub changeID {
return sprintf "%04d", $_[0];
}