Sharpless 101 (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.

Sh2-101, at least in the field seen from Earth, is in close proximity to microquasar Cygnus X-1, site of one of the first suspected black holes. Cygnus X-1 is located just out of the field of view of the photo in the infobox. The companion star of Cygnus X-1 is a spectral class O9.7 Iab supergiant with a mass of 21 solar masses and 20 times the radius of the Sun. The period of the binary system is 5.8 days and the pair is separated by 0.2 astronomical units. The black hole has a mass of 15 solar masses and a Schwarzschild radius of 45 km. A bowshock is created by a jet of energetic particles from the black hole as they interact with the interstellar medium. It can be seen as an arc at the top of the photo on the left.
(quote from Wikipedia)

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Date and Place

Fujigane Remote Observatory, Yamanashi, Japan

Scope Takahashi Epsilon180ED + BetaSGR Focuser
Mount Skywatcher EQ8
Camera ZWO ASI6200MM-Pro : -15[deg-c]
Auto guiding QHY mini guide scope + ZWO ASI120MM mini

Astrodon Tru-balance Gen.2 E-series RGB Filter
Astrodon Ha 5[nm], S2 5[nm], O3 5[nm] Filter

Exposure Epsilon180ED + ASI6200MM-Pro
Ha  : 66×900[s], O3 : 36×900[s], S2 :20×900[s]
, R : 5×300[s], G : 5×300[s], B : 5×300[s]
Total :1,905[min] = 31.45[hr]

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PHD Guiding 2.6.10
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