Sh2-101 and Cygnus X-1 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: B144 · Sh2-101

Sh2-101 and Cygnus X-1

This image captures 2 beautiful objects located in the constellation of Cygnus at a declination of +35 degrees.

Sh2-101, nicknamed the Tulip Nebula, is the cosmic flower at center. Ultraviolet radiation from stars power the emission, specifically star HDE 227018 which is the brightest blue star in the image, inside the bluish arc near the tulip's center. Also, note the two prominent dark nebulae, comprised of dust, emanating from the center of the tulip, one up and one to the right. This gorgeous nebula is about 6,000 light years away from Earth. It is 25 arc-minutes wide to our apparent view, close to the size of our full moon, and is about 50 light years in width.

The second object in the image is the binary star system Cygnus X-1, believed to contain a black hole. This object is one of the brightest X-ray sources on the sky, with a name indicating that it is the brightest X-ray source in the Cygnus constellation. The black hole is of course invisible, but the bright blue supergiant star HDE 226868 is believed to be contacted to its black hole companion by a stream of gas. The faint blue bubble nebula is believed to be an expanding bow shock shell that is related to this black hole. This is the northern bow shock front – the likely corresponding southern bow shock front has yet to be seen.

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Status	Advanced success
Started	...
Astrometry.net job	4029277
PixInsight job	MLLO2RPK52PKQTSOQZ1AZGXR47RY44L0
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h00m03s.825
RA (top/left)	20h03m09s.910
RA (top/right)	19h56m59s.850
RA (bottom/right)	19h57m00s.867
RA (bottom/left)	20h03m06s.327

Dec (center)	+35°20′26″.29
Dec (top/left)	+35°50′20″.92
Dec (top/right)	+35°50′28″.92
Dec (bottom/right)	+34°50′13″.88
Dec (bottom/left)	+34°50′06″.18

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Sh2-101 and Cygnus X-1

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