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IC5146
- The Cocoon Nebula
Emission/Dark
Nebula in Cygnus
Uploaded
9/11/05
There
are two deep sky objects in this image: the Cocoon nebula in
the center, and the galaxy MAC2154+4707 located just below the
very bright star on the lower left. The Cocoon nebula is a mix
of pink emission nebulosity and blue reflection illuminated by
the star cluster seen here in its core. It is more than 10 arcminutes
in size, my field here is 30 minutes wide. Inside you can see
dark nebula superimposed on the pink part but no Bok globules
making stars.
Equally interesting
is the nearly edge on spiral seen at the lower left. Very dim
at 17.0 magnitude, it is .7 x .1 minutes in size (yes that's
6 arcseconds wide) and yellowed by interstellar extinction which
is quite a lot in this part of the sky.
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Instrument: 12.5" f/5 Home made Newtonian
Platform: Astrophysics 1200 QMD
CCD Camera: SBIG 10XME NABG with Enhanced Cooling
Guider: SBIG ST4
Exposure: LRGB = 60:20:20:20 (RGB Binned 2x2)
RGB Combine Ratio: 1: 1.05: 1.11
Filters: AstroDon RGB Tricolor
Location: Payson, Arizona
Elevation: 5150 ft.
Sky: Seeing FWHM = 4.3 arcsec (Maxim DL - 10min subframe), Transparency 8/10
Outside Temperature: 60 F
CCD Temperature: -30 C
Processing Tools: Maxim DL, Photoshop, PixInsight, CCDOps Debloomer.
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