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NGC7023 / The Iris

Classification: Reflection & Dark nebula NGC7023, C4, LBN 487, Ced 187 and LDN 1170, LDN 1172 A-1, A-2, A-3. LDN1174
Constellation: Cepheus (Cep)
Object Location: Ra 21h 01m 49s Dec +68° 14’04° (current)
Size & Distance: The Iris-18 x 18 Apx 1,300 light-years

Date & Location: 09-02-2016 Palomar Mountain, CA.
Exposure: LRGB 150, 60, 60, 60. Lum-15x10, RGB-4x15 ea. (bin 1x1)
Optics: Telescope Engineering Company APO110FL @ f/5.74, 631mm.
Mount: Astro-Physics 1200 GTOCP3 / ATS 10x36 pier.
Camera: FLI-ML16200 G1 @-25c / FLI CFW2-7 / Guided by SBIG ST-I / w OAG.
Filters: Astrodon 50mm G2 LRGB
Software: MaxImDL 6.10, Photoshop CS5, CCDStack Topaz Studio.

Notes: Sky conditions: Good seeing, No wind, Temp Low 60’s
Image Field of view is 125 x 106 arcmin.

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.