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NGC 7023 IRIS NEBULA

 
 
  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.
ngc7023 rgb

 

Location Varia Agrinion, Greece.
Date 1-2/07/2011.
Telescope Sky-Watcher 190mm Mak-Newtonian.
Mount NEQ6-Pro.
Camera QHY8 Colour.
Guiding Finder 8x50+QHY5+PHD 1.12.3
Exposures RGB 57x10min= 09:30 Hours.
Calibration Frames 40xBIAS,40xFLATS,40XDARK FLATS.
Capture Nebulosity.
Stack Deep Sky Stacker.
Processing Pixinsight 1,6 core, Photoshop, CS5.