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The Jellyfish Nebula (IC443) is a fairly large nebula and bright in the H-alpha and SII bands, but weak in OIII. Captured over 3 nights at Wa-chur-ed Observatory (SW Washington).
9 x 30 min. H-a, 6 x 30 min. each, SII and OIII
AT111EDT at f/5.6
QSI583wsg with Astrodon 3nm filters
AP Mach1 mount