NGC 7023 – IRIS nebula



The Iris Nebula, also NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus. NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by a magnitude +7 star, SAO 19158.[1] It shines at magnitude +6.8. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alphirk). It lies 1,300 light-years away and is six light-years across.[2]Credit : Wikipedia

no star version (only PS minimum filter ) :






Optics:Celestron C11 @  f6,3 Optec Lepus reducer ; wide data : C11 hyperstar @ f1,9
Mount:Avalon M1 Fast Reverse
Camera:SX H694 unbinning
Location:Viterbo, W. Herschel obs./ Forca Canapine 
Exposure:Lum  : 340 min ( f6 )  +  174 min (hyperstar mode) RGB : Alessandro Milani .
Cooling: avg – 5°
Acquisition: Astroart, Sequence Generator Pro, PHD2, Avalon Star Go
Processing: Iris, PS, PixInsight, CCD sharp, 
SQM-L: 20.2
Note um: 78%





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