North American and Pelican Nebulae, Widefield Mosaic

       NGC 7000

All Images
Copyright Steve Cannistra

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Please click here or on image for a higher resolution view.
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Magnitude:  8.0
Size: About 2 x 3 degrees for this two frame mosaic.
Distance: ?
RA: 20h 50m 57s
Dec: 44 degrees 21' 52"


The region around NGC 7000 in Cygnus is a favorite target for widefield astrophotography in Ha light.  The deep shadows and rifts in this nebula are caused by dust that obscures visible light emitted by ionized gas such as hydrogen, oxygen, and sulfur.  This represents a two-frame mosaic using the CM10 camera in conjuction with the Sky90 at f4.5, resulting in a FOV of about 2 x 3 degrees at an image scale of 3.46 arcsec/pixel.  Click on the links above to view the higher resolution images.  Note:  Higher resolution files are large- please allow full download before viewing.

Photographic Details:

Dates:  Taken on two consecutive nights, 6/19/05 and 6/20/05.

Takahashi Sky 90 at f4.5 with field flattener/focal reducer, on the G11 Losmandy Mount.
Autoguider:  SBIG STV with e-finder.
Camera:  Maxcam CM10.
AstroDon Ha filter (6 nm bandpass).
Exposures (unbinned):  Lower half:  20 x 10' each.  Upper half:  16 x 10' each.  Total exposure 6 hours.
Conditions:  6/19/05- average transparency; good seeing; calm; 6/20/05- good transparency, poor seeing, full moonlight.
Image Processing:  Calibrated subs were debloomed with Ron Wodaski's Debloomer software, and then aligned in Registar.  Sigma combined using RC Sigma Reject MaximDL, followed by DDP in ImagesPlus (IP).  Mosaic construction, levels, curves, high-pass sharpening in Photoshop CS (16 bit format).  The Shadows/Highlights tool in Photoshop CS was particularly useful for enhancing contrast in this image.

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