IC 5146  - Cocoon Nebula

IMAGE DETAILS

Object ............................................ IC 5146 - Cocoon nebula
Constellation ..............................  Cygnus
RA / DEC ..................................... 21h:53m.29sec / +47 16m.01sec
Distance + Ap. Magnitude.........  3300 Light Years - 7.2
Date + Time .................................  20/7 - 2/8 -2014
Location ....................................  
Remote imaging from "Nunki Observatory" - Skiathos
Optics .........................................    Officina Stellare Advanced RILA 400
f/5.25
Tools ..........................................    The SKY X
Camera .....................................  
SBIG STXL11002  with FW8G-STXL (Astrodon filters)
Exposure Time.......................     Luminance: 12 X 600 sec , RGB : 6 X 600 (each)
More Details ...........................    Environment Temperature : 29oC Camera Temperature -25οC
Mount .......................................   Paramount ME
Guiding ....................................   Self guided
Processing Details ................    Photoshop , Maxim DL v6 , CCDStack 2
Notes ........................................   Weather: Clear   Transparence: Mediun  Humidity : 72-89%

Target details .........................  
IC 5146 (also Caldwell 19, Sh 2-125, and the Cocoon Nebula) is a reflection/emission nebula and Caldwell object in the constellation Cygnus. The NGC description refers to IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula. The cluster is also known as Collinder 470. It shines at magnitude +7.2. Its celestial coordinates are RA 21h 53.5m, dec+47 16′. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 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;[6] the nebula is about 12 arcmins across, which is equivalent to a span of 15 light years.When viewing IC 5146, dark nebula Barnard 168 (B168) is an inseparable part of the experience, forming a dark lane that surrounds the cluster and projects westward forming the appearance of a trail behind the Cocoon.

Nikos Paschalis