ADC Bahtinov C/2023 A3 (Tsuchinshan-ATLAS) C8 C9.25 callisto CANON EOS 100D chat collimation cyrillus dioné donut europe Evolux 62ED focuser France 3 ganymède Hartmann IC1396 IC1805 IC434 IC5070 Io jupiter lune M100 M101 M106 M13 M31 M32 M33 M42 M45 M51 M63 M64 M65 M66 M81 M82 markarian mars musk NDC2237 NDC6992 nectars NGC1977 NGC2237 NGC3628 NGC4248 NGC4312 NGC6888 NGC6960 NGC6992 NGC7000 Nuit des étoiles Réducteur de focale rhéa Rosette satellite saturne soleil starlink téthys théophilus titan vénus ZWO ASI 120 MC