Gallery News

NGC7023 Iris Nebula

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.


Technical Data

Bortle Scale / SQM-L Bortle 4/5  / -20.10 - 20.34
Period June 2021 - August 2023
Primary Scope  CCA250 / FSQ106  
Camera CMOS IMX455 / CCD  KAF-8300
Mount AP 1100 GTO CP4
Total Exposure Time 7,5h
Composition LRGB
Location Val Imagna (Bergamo) Italy



 © Efrem Frigeni Astrophoto

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