Deep Sky Object in Summer
Cocoon Nebula (IC5146 in Cygnus)

Date & Time: Aug 2 2008, from 23:50 to 24:06 JST(+0900)
Composed 4 shots with 5 minutes exposed
Optical: TAMRON SP f=300mmF2.8, Aperture: F2.8
with IDAS LPS-P2 light-pollution suppression filter
Auto-guided with TAKAHASHI EM-200 equatorial
Digital Camera: Nikon D50 (Remodeled)
Location: Koumi town, Nagano pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3008×2000)
CCD Sensitivity...ISO1600

IC5146 / Diffused Nebula, type 1 E
R.A.21h 53m 24.0s (2000.0)
Dec.+47° 16' 00" (2000.0)
Apparent Size12'
Real Size19 light yrs.
Magnitude -
Distance5500 light yrs.
Other IDsSh2-125, LBN424
IC5146 is a small round reflection nebula near a border to Cepheus, with a size of 12 arc minutes. A nickname of "The Cocoon Nebula" has came from its round shape and dimmed impression. A dark filament of B168 is stretched westward from the cocoon nebula itself, and it seemingly looks like that the nebula is drifting in the Milky Way, very humorous view. The nebula is estimated about 5500 light years away.

Jump to Close-up of Cocoon Nebula (85KB)


Diffused Nebulae in Cygnus

Copyright(c) 2008 by Naoyuki Kurita, All rights reserved.
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