The Iris Nebula, also known as 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)
Imaging Data:
Image: NGC 7023
Date 6/10/19, 8/22/19, 7/9/20, 7/11/20
Exposure: 120 sec & 180 sec for 12 hours of images
Binning = 1×1
Gain = 120
Camera Temperature= 0 deg C
Filter= STC Astro Duo-Narrowband Filter
Camera = ASI294MC PRO in Hyperstar position