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Tuesday, November 29, 2016

A little different view to the North America nebula, part III

This photo is result from my mosaic project for this Autumn season. My purpose was to image the North America Nebula, NGC 7000, and show it little differently, than usually. This object is a popular target among astro photographers, I found some rarely imaged areas and made my composition out of them. There are three panels used for this mosaic, total exposure time for all three emission line is around 16 hours.

A detail from the North America nebula as a three panel mosaic
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Image is in mapped colours, from the emission of ionized elements, R=Sulphur, G=Hydrogen and B=Oxygen.

An experimental starless version
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The actual gas formations stand out well in this starless version.

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

Couple of individual image panels
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Please, click for a large image

Area of interest is marked as a white rectangle 
This wide field photo of the North America and Pelican Nebulae was shot with Canon EF 200 mm f1.8 camera lens, QHY9 astrocam and Baader narrowband filters.

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 for all three panels
H-alpha, 18 x 1200 s = 6 h
O-III, 18 x 1200 s binned 2x2 = 5 h 
S-II,  18 x 1200 s binned 2x2 = 5 h 
Total 16 h

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