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NGC7023 / The Iris Nebula

Classification: Reflection nebula, NGC7023, Caldwell 4
Constellation: Cepheus (CEP)
Object Location: Ra 21h 01m 49s Dec +68° 14’04° (current)
Size & Distance: 18 x 18 Apx 1,300 light-years.

Date & Location: 08-22-2014 Palomar Mountain, CA
Exposure: LRGB, L=16, RGB=15, All 5mn. (bin 1x1)
Optics: Telescope Engineering Company APO180FL @ f/5.23 using an Astro-Physics TCC160, F/L 941mm
Mount: Astro-Physics 1200 GTO / ATS 10x36 Pier
Camera: FLI-MLx694 @-20c / CFW2-7 / FLI-Atlas focuser / Guided by SBIG ST-I / w OAG.
Filters: Astrodon G2 LRGB
Software: MaxImDL 6.06, CCDStack, Photoshop CS5, Topaz Lab.

Notes: Sky conditions: Average seeing, calm winds, low 60’s
Image Field of view is 36 x 45 arc-min.

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.