IC5146 - Cocoon Nebula (Ha)  
Cygnus

Reflection, emision and absorption nebula 		 
 
The Cocoon Nebula is a small round nebula centered near the apex of several dark lanes in the otherwise rich star fields of Cygnus. It floats within a sea of dark clouds and huge amount of stars. It is a star forming region, embedded in an open cluster of about 80 young stars, and contains emission, reflection and absorption nebulas. The large central star within the Cocoon has blown a hole in the nebula gas and is likely responsible for exciting the surrounding hydrogen to emit in Ha light.

IC 5146, also Caldwell 19 and the Cocoon Nebula, is located near the naked-eye star Pi Cygni, the open cluster NGC7209 in Lacerta, and the bright open cluster M39.

The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago; the nebula is about 12 arcmins across. 		 
 
Technical details:  
Location:  
 Valdemorillo - Spain
Date:  
 04/09/2009 (dd/mm/yyyy)
Conditions:  
 Bad
Temperature:  
 20ºC
Humidity:  
 40
 
Telescope:  
 GSO Reflector 200mm f/4
Reducer/corrector:  
 Baader MPCC
Filter:  
 Baader Ha 7nm 2"
Mount:  
 Meade LXD Autostar
Camera:  
 Canon 350D no filter
Exposure:  
 20x300s@800iso
Guiding tube:  
 B&C 60/350 f7
Guiding camera:  
 Meade DSI Pro
Guiding software:  
 PHD Guiding
 
Procesing:  
  
Notes:  
  
     

 
All Contents Copyright by Jaime Fernández and Copyright of their respectives owners. Text mainly extracted from Wikipedia.
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