SH2-104 & LBN 195 (Roland Schliessus)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: HD228754 · HD228801 · LBN 195 · Sh2-104

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SH2-104 & LBN 195

Link: http://www.roland-schliessus-astro.de/

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SH2-104 & LBN 195

Link: http://www.roland-schliessus-astro.de/

SH2-104 is a visible emission nebula in the constellation Cygnus. It is located in the central-southern part of the constellation, about 4 ° to SSW of the star Sadr (γ Cygni); the best period for its observation in the evening sky falls between the months of June and November and is facilitated by the regions located in the terrestrial northern hemisphere. It is a roughly circular H II region with a darker area that crosses its north-central region; in its direction extends a long and thick nebulous filament belonging to the great nebula region of Cygnus X. In the Sharpless Catalog it is hypothesized that it belongs physically to this complex, while subsequent studies have shown that its distance is much greater than that of Cygnus X, around 4400 parsecs (over 14300 light years); a similar distance places SH2-104 in the outer regions of the Milky Way, probably in correspondence with the Arm of Perseus. The mass of the nebula is estimated at 450 M⊙, while the main source of gas ionization would be a main sequence blue star with spectral class O6V. The action of the stellar wind of the young ionizing massive star has generated an expanding ring-shaped bubble, along which four large molecular condensations are observed, in turn divided into some dense nuclei. The center of the nebula instead hosts a very young open cluster clearly visible in the infrared band, where some sources have been observed (including IRAS 20156 + 3639 and IRAS 20160 + 3636; among the components of the cluster there is at least one massive star, responsible for the ionization of an ultra-compact H II region.

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Status	Advanced success
Started	...
Astrometry.net job	6496978
PixInsight job	LNPFRTJ931YZB1AI51DZLH19ZLLNUT46
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h17m47s.887
RA (top/left)	20h16m51s.948
RA (top/right)	20h17m33s.101
RA (bottom/right)	20h18m43s.717
RA (bottom/left)	20h18m02s.762

Dec (center)	+36°45′34″.77
Dec (top/left)	+36°53′10″.23
Dec (top/right)	+36°32′22″.12
Dec (bottom/right)	+36°37′58″.80
Dec (bottom/left)	+36°58′47″.72

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SH2-104 & LBN 195

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SH2-104 & LBN 195

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