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Monday, October 10, 2016

A little different view to the North America nebula, NGC 7000

I have planned to shoot this area of the North America Nebula for years. NGC 7000 is very well known and much imaged area of the sky. I always trying to find new visual aspects from the popular objects. Nebula itself is relatively bright, only five hours of exposures was needed for a good signal.

A detail from the North America nebula
Please, click for a large image

Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen.

An experimental starless view reveals details in the actual nebula
Please, click for a large image

There is a somehow eerie feel in this starless version

Image in visual spectrum
Please, click for a large image

Image is in Natural colour palette from the emission of ionized elements, 
R=Hydrogen + Sulphur, G=Oxygen and B=Oxygen + ~10% Hydrogen.

Please, click for a full size photo

Area of interest is marked as a white rectangle 

Technical details

Processing work flow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f10 with 0,7 focal reducer for Edge HD 1100 telescope

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2 and SXV-AOL

Astrodon filter, 5nm H-alpha
Astrodon filter, 3nm O-III
Astrodon filter, 3nm S-II

Exposure times
H-alpha, 9x 1200s = 3h
O-III, 3 x 1200s binned 2x2 = 1h 
S-II,  3 x 1200s binned 2x2 = 1h 
Total 5h

A single uncropped, calibrated and stretched 20 min. H-alpha, O-III and S-II frames as they comes from the camera

H-alpha emission

S-II emission

O-III emission

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