Galactic Nebula NGC 6813

NGC 6813
NGC 6813: Galactic nebula in Vulpecula; 500 mm Cassegrain 3625 mm f/7.2; SBIG STL11K; 290+3*60 min LRGB; Bernese Highlands; © 2015 Radek Chromik

History

The emission nebula NGC 6813 was discovered on August 7, 1864 by the German astronomer Albert Marth using William Lassell's 48 inch f/9.4 Newtonian telescope in Malta. [277, 396] He described the object as «two stars in very faint, small nebula». [313]

In 1946 the German astronomer Rudolph Minkowski published a list of emission nebulae which he discovered on photographic plates exposed by William C. Miller with the 10 inch telescope at Mount Wilson Observatory. There he classified NGC 6813 (also Min 1-93) as a diffuse one or strange nebula, noting that Heber D. Curtis observed a visually continuous spectrum in 1918, but the nebula showed fairly strong Hα emission. [397]

Physical Properties

On Simbad, NGC 6813 is classified as interstellar matter. No distance information can be found. [145] The designation IRAS 19383+2711 indicates an infrared source, which is due to a star cluster embedded in dense gas and dust from which only the far-infrared emission can be seen. [398] A strong source of microwave radiation in the 6.7 GHz line, a so-called methanol maser, was also found, indicating the formation of massive stars. [399] NGC 6813 is an ultra-compact H-II region in which stars are formed.

«Revised New General Catalogue and Index Catalogue» Dr. Wolfgang Steinicke, 2021 [277]
DesignationNGC 6813
TypeEN
Right Ascension19h 40m 24.0s
Declination+27° 18' 34"
Diameter3.00 × 3.0 arcmin
Dreyer Description** in vF, S neb
IdentificationSG 3.148

Finder Chart

The galactic nebula NGC 6813 is located in the constellation Vulpecula. The best observation time is May to October.

Chart NGC 6813
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
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
313«A New General Catalogue of Nebulae and Clusters of Stars, being the Catalogue of the late Sir John F.W. Herschel, Bart., revised, corrected, and enlarged» Dreyer, J. L. E. (1888); Memoirs of the Royal Astronomical Society. 49: 1–237; Bibcode:1888MmRAS..49....1D
396«William Lassell's (1799-1880) telescopes and the discovery of Triton» Pedro Ré; astrosurf.com/re/william_lassell_telescopes.pdf (2021-06-25)
397«New Emission Nebulae» R. Minkowski; Publications of the Astronomical Society of the Pacific, Volume 58, Number 344, 1946; DOI:10.1086/125855
398«New infrared star clusters in the Northern and Equatorial Milky Way with 2MASS» E. Bica, C. M. Dutra, J. Soares and B. Barbuy; A&A Volume 404, Number 1, June II 2003; DOI:10.1051/0004-6361:20030486
399«New detections of 51-60 A+-methanol masers towards IRAS sources.» van der Walt, D. J. ; Gaylard, M. J. ; MacLeod, G. C.; Astronomy and Astrophysics Supplement, v.110, p.81; April 1995; Bibcode:1995&AS..110...81V