NGC7023

My third color image captured with a mono CCD camera. A great challenge especially the color handling. I followed the normal procedure for combining and color calibration whiteout any “smart” trick that often leads to bad results. The combination with the luminance was done with stretched images. The rest of the processing was then easy.

Final Colorful

Final

Luminanse

Colorful

Experimental

LRGB

Telescope

Boren-SImon 8" F3.6

Imaging Camera

Starlight Xpress H9 Mono

 

 

Exposures :

20*300 L, 10*600L

20*300 R, 20*300 G and 20*300 B

 

 

 

 

 

 

Reduser/Corrector

ASA 2" x 0,73 Corrector/Reducer 2KORRR

FIlters

Astrodon LRGB CCD Imaging Filters (E-Series),

Date

Nov and Dec.. 2014

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..(WIKI)