WR 134 & SH2-104 & SH2-101 The Tulip Nebula (Roland Schliessus)

WR 134 & SH2-104 & SH2-101 The Tulip Nebula

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

WR 134 is a variable Wolf-Rayet star located around 6,000 light years away from Earth in the constellation of Cygnus, surrounded by a faint bubble nebula blown by the intense radiation and fast wind from the star. It is five times the radius of the sun, but due to a temperature over 63,000 K it is 400,000 times as luminous as the Sun.

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.

SH2-101 is a H II region[1] emission nebula located in the constellation Cygnus. It is sometimes also called the Tulip Nebula because it appears to resemble the outline of a tulip when imaged photographically. It was catalogued by astronomer Stewart Sharpless in his 1959 catalog of nebulae. It lies at a distance of about 6,000 light-years (5.7×1016 km; 3.5×1016 mi) from Earth.

=============== Source: Wikipedia ==================

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Status	Advanced success
Started	...
Astrometry.net job	7676155
PixInsight job	KD3TRU2MR5TT51B2VU4P81B6W4F8MPY3
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h07m54s.44
RA (top/left)	20h22m24s.50
RA (top/right)	20h01m43s.63
RA (bottom/right)	19h53m32s.19
RA (bottom/left)	20h13m40s.50

Dec (center)	+36°10′14″.1
Dec (top/left)	+36°26′13″.6
Dec (top/right)	+38°50′01″.10
Dec (bottom/right)	+35°47′49″.10
Dec (bottom/left)	+33°29′21″.4

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