IC 5146 (Cocoon Nebula) and VdB 147 in Cygnus

  Size: 1800 px      
© Velimir Popov & Emil Ivanov 2011 - 2017

IC 5146 (also catalogued as Sh 2-125, Ced 198, LBN 424, Min 2-70, Caldwell 19 or Cocoon Nebula) is a reflection/emission nebula in the constellation Cygnus. Properly speacking, IC 5146 refers to the star cluster and Sh2-125 to the nebula.The small reflection nebula in the bottom right corner is Van den Bergh 147 (VdB 147). Its illuminating star is known by the abbreviation BD + 46 ° 3471 and is a main sequence blue star with spectral class B9.5Ve having apparent magnitude of 10.16. This star has strong emission lines in the band of hydrogen and is classified as a Be star. It is also a variable star of the FU Orion type and has the abbreviation V1578 Cygni. Its brightness variations are between magnitudes 10.09 and 10.24. Its distance is equal to 1012 parsec (3300 light years), the same as the Cocoon nebula. Magnified closeup of VdB 147 can be seen below:

Image details:


Center of field RA 21:53:30 (h:m:s)
Center of field DE +47:15:53 (deg:m:s)
Size 21.6 x 15.2 (arcmin)
Pixel scale: 1.03 (arcsec/pixel)
Orientation: Up is 351 degrees E of N
Charts and image details obtained from Astrometry.net
Optic(s): ASA 12" Astrograph @ f/6.8 (Newton)
Mount: ASA DDM85 Standard
Camera: SBIG STL 11000 M
Filters: Luminance, Red, Green, Blue, Astronomik filters
Dates/Times: 27-29 Jul .2011
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:14x10 min; R:12x10 min, G:13x10 min, B:13x10 min Bin 1, Total: 520 min (8hrs:40min)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013 - 2017. All Rights Reserved
e-mail: info@irida-observatory.org
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