|
Exposure |
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. |
|
Software |
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 |
|
Comment |
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.
|
