Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  B168  ·  Cocoon nebula  ·  IC 5146  ·  IC5146  ·  NGC 1664  ·  Sh2-125  ·  VdB147
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IC5146 Cocoon Nebula, vdB147, B168, LDN1055; Cygnus, 


            Thomas V. Davis
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IC5146 Cocoon Nebula, vdB147, B168, LDN1055; Cygnus

Technical card

Astrometry.net job: 2120603

RA center: 21h 47' 9"

DEC center: +47° 31' 56"

Pixel scale: 3.509 arcsec/pixel

Orientation: 3.351 degrees

Field radius: 1.508 degrees

Resolution: 3905x2548

Locations: Thomas Davis, Inkom, ID, United States

Data source: Backyard


IC5146 Cocoon Nebula, vdB 147, B168, LDN1055; Cygnus
Astro Systeme Austria N12 f/3.5 astrograph (Lum)
Takahashi FSQ-106 f/5 astrograph (RGB)
KAI-11000M; SBIG STL (Lum), FLI Microline (RGB)
Total Exposure Time: 14 hours; LRGB 650:80:80:80 minutes, unbinned
June 2008; Inkom, ID

Comments: This was my first attempt at a mosaic image. It was taken, processed and published in 2008.

This nebula, which is about 3,300 light years distant, lies among some of the richest star fields in the northern Milky Way (as one can see, there are a lot of stars). First noted by British double-star observer Thomas E. Espin, this complex nebula seems to sit at the end of a long, star poor path. This "path" is actually dense gas and dust which obscures the light of the stars more distant to it. In this image, the background has been carefully adjusted so to show the obscuring dust in the region. As you can see, the dark dust lanes vary from moderately opaque to deeply obscuring. There is a lot of dust in the region. Van den Bergh 147 is the small reflection nebula just to the lower right of the Cocoon.

vdB147: Size (arcmin): 1.8
Type: illuminating star inside nebula
Surface brightness: moderate
Color: blue
Absorption: strong
Illuminating star ID1: BD+46 3471
Mag. of illuminating star: 10.16
Spectral type of star: B9.5Ve


Sky plot

Sky plot


IC5146 Cocoon Nebula, vdB147, B168, LDN1055; Cygnus, 


            Thomas V. Davis