This dark nebula,
B33, a collection of
gas and dust, is only
seen due to its
being silhouetted
against
a backround
emission nebula, IC
434 -- the Horsehead
may be the most
recognizable icon in
all of astronomy.

Other wider field
versions of the
Horsehead appear on
this site, but none can
match this one for
resolution, albeit at the
price of a smaller field
of view.
16" RCOS @ f/11.3
Apogee U9 imager
SBIG 402 guider
Astrodon Series I LRGB

(HaR)(HaRGB)

Ha =   19 hours, 1x1
R  =    4.5 hours, 1x1
G  =    2 hours, 1x1
B  =    3 hours, 1x1

Data acquired at
CTIO

Processed with CCD
Inspector,  Maxim,
PixInsight, Neat Image,
and Adobe PS.
            Horsehead Nebula
      Click on image to enlarge