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. (Source: Wikipedia)
Technical Details
Date: 22/2/2018
Location: Cologne, Germany
Imaging Telescope: 8″ GSO f/4
Imaging Camera: Nikon D7000
Filter: Baader Planetarium UHC-S
Mount: Skywatcher EQ-6
Guiding Telescope: TSO 80mm
Guiding Camera: QHY 5L-II
Integration: 70 x 2.5 min. (ISO 1000)
Software: PixInsight, SofortBild, OpenPhDGuiding, INDI
Plate Solution
(Source: astrometry.net)