Cygnus X-1 Shock Front and Tulip Nebula Sh2-101 LBN 168 (Mau_Bard)

Cygnus X-1 Shock Front and Tulip Nebula Sh2-101 LBN 168

Image taken during 4 short summer nights (17, 18, 19, 20 July 2022), from my Bortle 7 Vienna city backyard.

The only two stars visible in the picture, together with their waves of matter, tell us two different stories.

Tulip Nebula
Sharpless 101 (Sh2-101) is a H II region emission nebula located in the constellation Cygnus. It is 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.
Nearly 70 light-years across, the Tulip Nebula is about 8,000 light-years away. Ultraviolet radiation from young energetic stars at the edge of the Cygnus OB3 association, including O star HDE 227018, visible near the center of the image, ionizes the atoms and powers the emission from the Tulip Nebula.

Cygnus X-1
The micro-quasar Cygnus X-1, one of the strongest X-ray sources in planet Earth's sky is in the field. Blasted by powerful jets from a lurking black hole is the faint bluish curved shock front, visible in the right side of the frame.

(Excerpts from Wikipedia and NASA APOD 1 September 2022)

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