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Astrophotography by Bob Franke

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NGC 7000

The Cygnus Mountains AKA Cygnus Wall - Color Mapped

      Click the full screen zoom button           ^
Click the image to Zoom and Pan              

Click here to view the image without Zoomify (1950 x 1275)  


      Click the full screen zoom button           ^
Click the image to Zoom and Pan              

Click here to view the image without Zoomify (1950 x 1275)    


12.5" RCOS @  ~f/9 (2880 mm fl) 0.643 arcsec / pixel.  Zoomify image scale is 1.28 to 3.33 arcsec / pixel.


Paramount ME


SBIG STL-11000 w/ internal filter wheel, AstroDon 6nm Filters

Acquisition Data

8/26/2009 to 10/16/2009 Chino Valley, AZ... with CCDAutoPilot3 & CCDSoft.


SII   540 min. (18 x 30 min. bin 1x1)

Ha   480 min. (16 x 30 min. bin 1x1)
OIII  480 min. (16 x 30 min. bin 1x1)

SII,Ha & OIII are mapped to RGB respectivly. 

Click here for an RGB natural color version.

Click here for an Ha filtered b/w version.


CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin and Noel Carboni's actions.

PixFix32 (pre-beta) to repair hot/cold pixels and column defects.

CCDStack to calibrate, register, normalize, data reject, combine the sub exposures.

PhotoShop for on-linear stretching and LRGB color combine


The image is rotated 130 degrees CCW.

This image shows the Cygnus Wall, in the southern part of the North American Nebula... NGC 7000. The emission nebula is in the constellation Cygnus, at a distance of about 1600 light years. When shown rotated 130 degrees CCW, the Cygnus Wall becomes the Cygnus Mountains. This area of the Nebula, correlates geographically to southern Mexico. The famous wall, an energized shock front, provides contrast to the adjacent dark "Gulf of Mexico" area, filled with dark gas and dust lanes.

Discovered by William Herschel on October 24th 1786 from Slough England.

These false color images were acquired with Ha, SII and OIII filters mapped to the RGB channels respectively. The colors of top image more closely follow the Hubble Palette, with the color channels pretty much stretched to equal levels.  The presence of sulfur, hydrogen and oxygen are clearly shown. Red indicates the presence sulfur, green hydrogen and blue oxygen. With no color manipulation, the image would be basically green, due to the dominance of hydrogen.

The lower image was severely processed to produce ever popular orange and blue colors, but still reveals a similar structure to the nebula.