The Iris Nebula, also NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation of Cepheus. NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by the mag 7.4 star SAO 19158. It lies 1'300 light-years away and is six light-years across.
Telescope: RCOS 14.5" f/8
Mount: ASA DDM85
Filters: Astrodon Gen 2
Exposures: LRGB 540:140:160:100 min (20 min subframes)