NGC 7023

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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.

Imaging telescopes or lenses: TPO 8″ Ritchey–Chrétien
Imaging cameras: SBIG ST-8300M
Mounts: Orion Atlas EQ-G
Guiding cameras: SBIG ST-i Planetary and Guide Camera Mono
Focal reducers: CCDT67
Filters: Astrodon Tru-Balance Generation 2 E-Series – LRGB 36mm Round Fil
Accessories: SBIG OAG-8300
Dates: Aug. 26, 2014
Frames:
Astrodon Tru-Balance Generation 2 E-Series – LRGB 36mm Round Fil: 12×600″ -10C bin 1×1
Astrodon Tru-Balance Generation 2 E-Series – LRGB 36mm Round Fil: 18×600″ -10C bin 2×2
Integration: 5.0 hours

Author: Mike Carroll
AstroPhotography of the day by SPONLI 05 Sep 2014