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 theMira-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.
Imaging telescopes or lenses: CELESTRON Edge HD 800
Imaging cameras: Canon EOS 450D / Digital Rebel XSi / Kiss X2
Mounts: Orion Atlas EQ-G
Guiding telescopes or lenses: SkyWatcher 80/400
Guiding cameras: SBIG STV
Software: DeepSkyStacker, Adobe Photoshop CS5
Dates: July 14, 2012
Integration: 5.5 hours
Autor: Hata Sung
29 December 2013
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