A 8130 anos luz. At 8130 light years. M103, NGC 581 Enxame aberto - Open cluster , mag 7.4 *9.0, dim 6', n* 172 Cas, 01:33:22.0 +60 39 30

M103 Takahashi SKY90 f/4.5 (400mm)+ATIK-1HS 2.9" res 60% Takahashi P2Z exp: 9' (18x30")