min. (15 x 30 min. bin 1x1)
300 min. (10 x 30 min. bin 1x1)
OIII 300 min (10 x 30 min. bin 1x1)
Ha & SII was combined
for the luminance
SII,Ha & OIII mapped
to RGB respectivly
CCDStack, Photoshop CS w/ the Fits Liberator plugin and Noel Carboni's actions.
CCDStack to register,
normalize, data reject & combine.
non-linear stretching, sharpening and color combine.
North is to the top.
The Eagle emission nebula, also known as M16 or NGC 6611, lies about
6500 light years away, spans about 20 light-years, and is visible
with binoculars toward the constellation of Serpens.
This false color image
was acquired with SII, Ha and OIII filters mapped to the RGB
channels respectively. So in this image Red indicates the presence
Sulfur, Green Hydrogen and Blue for Oxygen.