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IC 5146



IC5146 - Cocoon Nebula in Cygnus

RA= 21hrs 53 min; Dec = 47 deg 16 min

Date & Site:

Imaged on 6/25/17; Mt Laguna, CA

Conditions: temps in the mid-60's; mild winds; below average seeing


Telescope: DSI RC10c, 1867mm at f/7.3

Guider: Internal guider

Mount: AP 1100 CP3
Camera: ST-10XME; CFW10; Astrodon Hydrogen alpha (3nm) and RGB Gen II filters


Exposures: 135 minutes of Ha (15 min subs) and 30 minutes each RGB (10 min subexposures) for total of 3.75 hours

The Cocoon Nebula is a reflection/emission nebula; reflecting radiated stardust (blue-grey dusty stuff in this image) and emitting hydrogen alpha (color mapped as red). Inside the nebula is a newly developing cluster of stars. The bright star near the center of this nebula is likely only a few hundred thousand years old. The designation IC 5146 refers to the star cluster while the nebula itself is listed as Sharpless 2-125.

Distance: 4,000 light years away

(image reduced to 60% of original size)

FOV = 22 x 14.5 arc minutes

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