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.

Luminance channel

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

the IRIS Nebula Recorded in September 2016

Technical Data

Bortle Scale / SQM-L	Bortle 4/5 / --
Period	September 2016
Primary Scope	FSQ106 106/530
Camera	CCD KAF-8300
Mount	NEQ6
Total Exposure Time	6H
Composition	LRGB
Location	Val Imagna (Bergamo) Italy