Astral Imaging at Dogwood Ridge Observatory

Latitude: 3748'51.0" N"
Scottsville, Virginia 24590


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NGC 7023 The Iris Nebula

Image Information

Quoted from Wikipedia, the free encyclopedia:

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.[1] 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.[2]


  1. Jump up ^ Perkins, Philip (2005). "NGC 7023". Retrieved 2008-08-06. 
  2. Jump up ^ Nemiroff, Robert; Bonnell, Jerry (2004-11-04). "APOD: 2004 November 4 - NGC 7023: The Iris Nebula". APOD (NASA). Retrieved 2008-08-06. 


  • Pasachoff, Jay M. (2000). "Atlas of the Sky". Stars and Planets. New York, New York: Peterson Field Guides. pp. 578 pg. ISBN 0-395-93432-X. 
  • Caldwell-Moore, Sir Patrick (2003). Firefly Atlas of the Universe. Firefly Books Limited. ISBN 1-55297-819-2. 

External links[edit]

Wikimedia Commons has media related to NGC 7023.







 NGC7023 The Iris Nebula

NGC 7023 The Iris Nebula

1600         2000


A Bit Darker

1600D         2000D


A Bit Darker w/Noise Ninja Applies to Background

1600Dnn         2000Dnn


  NGC7023 The Iris Nebula

NGC 7023 Full Crop

A Bit Darker


This image consists of 19 red, 20 green, and 19 blue RGB images all taken at -15C at bin 2x2 for 15 minutes each. A total of 49 luminance images binned 1x1 each 15 minutes long taken at -15°C were used. A total of 26.75 hours LRGB data used. All data was acquired using MaxImDl/CCD version 5.24 using ACP7.1.  Pix Insight version was used for processing. Dithered guiding was on.

Equipment and Location Information

Date July 25 - Aug. 4, 2014
Location Dogwood Ridge Observatory
Optics Optical Guidance Systems 12.5" RC @f/9
Mount Astro Physics AP1200GTO
Camera SBIG STL-11002M/CW8
Filters Baader LRGB Ha 7nm,SII 8nm, OIII 8.5nm - 50.8mm Unmounted Filters
Conditions Temperature low to mid 20s with moderate to good  seeing. Transparency good to moderate.

  Last Modified :10/02/12 01:10 PM