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Iris Nebula NGC 7023



 

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Common Name Iris Nebula
Formal Name NGC 7023 / Caldwell 4
Date 6/23/2015
Constellation Cepheus
Location BrewSky Observatory, Casa Grande, AZ
Equipment Takahashi Sky90 on Paramount, SBig ST2000XM Camera/Filter Wheel
unguided exposures
Temperature 0°C
Exposures
# Exp (sec) Filter Bin Net Time (hr)
33
33
900
180
Red 1x1 9.9
16
15
900
180
Green 1x1 4.75
15
15
900
180
Blue 1x1 4.5
Total 19.15 hrs
Processing This version uses only RGB exposures (Synthetic Lum by integrating RGB).
Reduced in Maxim
Aligned/Stacked/Processed in PixInsight
Notes 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. 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.. (Wikipedia)