Gallery News

  • M87 - Black Hole's Relativistic  Jet

    M87 - Black Hole's Relativistic Jet

    Resegone Observatory

    Efrem Frigeni - 2025

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  • IC 2169

    IC 2169

    Resegone Observatory

    Efrem Frigeni - 2024

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  • LDN 1622

    LDN 1622

    Resegone Observatory

    Efrem Frigeni - 2024

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  • NGC 2264

    NGC 2264

    Resegone Observatory

    Efrem Frigeni - 2024

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  • NGC1333

    NGC1333

    Resegone Observatory

    Efrem Frigeni - 2024

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  • DOUBLE CLUSTER

    DOUBLE CLUSTER

    Resegone Observatory

    Efrem Frigeni - 2024

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  • News

    News

    Resegone Observatory

    Efrem Frigeni - 2024

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  • TULIPAN NEBULA

    TULIPAN NEBULA

    Resegone Observatory

    Efrem Frigeni - 2024

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  • NARROW BAND COMPOSITION

    NARROW BAND COMPOSITION

    Resegone Observatory

    Efrem Frigeni - 2024

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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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