M20, the Trifid Nebula, is
located in Sagittarius, and
displays areas of
emission, reflection, and
dark nebulosity within its
borders. It is probably
about 5000 lightyears
distant. M20 is a low
object in my sky, and from
a visual perspective is
completely lost in the light
dome of Philadelphia, 30
miles to my southwest.
Nevertheless, I did a
reasonably good wide field
version of M20 from my
home, and it can be found
here. This image, taken
remotely from pristine skies
in Chile, is much better in
terms of resolution and
color, but also presents a
narrower field of view.
16" RCOS @ f/11.3
Apogee U9 imager
SBIG 402 guider
Astrodon Series I LRGB

with Ha added at the

  5 min x 36, 1x1
R=  1
0 min x 18, 1x1
G=  1
0 min x 18, 1x1
B=  1
0 min x 18, 1x1

Data acquired at

Processed with CCD
Inspector,  M
ixInsight, Neat Image,
and Adobe PS
         M20 -- the Trifid Nebula
  Click on image to enlarge