Reflection Nebula IC 5076

IC 5076
IC 5076: Reflection nebula in Cygnus; 500 mm Cassegrain f=3625mm / f7.2; SBIG STL11K; 105+3*30 min LRGB; Bernese Highlands; © 2011 Radek Chromik

History

The British astronomer Isaac Roberts discovered a nebula around the approximately 5 mag bright star V2140 Cygni on September 13, 1895. This was included in 1910 by the Danish-Irish astronomer John L. E. Dreyer in his «Second Index Catalogue of Nebulae and Clusters of Stars» published in 1910 under the designation IC 5076. [196, 315] The Canadian astronomer Sidney van den Bergh identified this nebula as a reflection nebula on the photo plates of the «Palomar Sky Survey» and included it under the name vdB 137 in his 1966 catalog of reflection nebulae. He noted: Type II (star outside the nebula), very bright, very blue, moderate absorption, radius 6.8 arcminutes (red) to 4.8 arcminutes (blue). [255]

Physical Properties

The star V2140 Cygni (HD 199478) is a blue supergiant of the spectral type B8Ia and belongs to the pulsating variables. Its brightness fluctuates by 0.1 magnitudes over the course of 27 to 55 days. [145, 366]

«Revised New General Catalogue and Index Catalogue» Dr. Wolfgang Steinicke, 2021 [277]
DesignationIC 5076
TypeRN
Right Ascension20h 55m 33.0s
Declination+47° 23' 42"
Diameter9.00 × 7.0 arcmin
Dreyer DescriptionvF, vL, lE ns, st inv
IdentificationLBN 394, CED 185

Finder Chart

The galactic nebula IC 5076 is located in the constellation Cygnus (Swan), which is best visible from April to November.

Chart IC 5076
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

References

145SIMBAD astronomical database; simbad.u-strasbg.fr/simbad
149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
196Celestial Atlas by Curtney Seligman; cseligman.com/text/atlas.htm (2020-12-28)
255«A study of reflection nebulae» van den Bergh, S.; Astronomical Journal, Vol. 71, p. 990-998 (1966); DOI:10.1086/109995
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
315«Second Index Catalogue of Nebulae and Clusters of Stars; containing objects found in the years 1895 to 1907, with Notes and Corrections to the New General Catalogue and to the Index Catalogue for 1888–94» Dreyer, J. L. E. (1910); Memoirs of the Royal Astronomical Society. 59: 105–198; Bibcode:1910MmRAS..59..105D
366«Spectral variability of luminous early type stars. I. Peculiar supergiant HD199478» Markova, N.; Valchev, T.; Astronomy and Astrophysics, v.363, p.995-1004 (2000); Bibcode:2000A&A...363..995M