Sh2-101 aka The Tulip Nebula in H-Alpha+RGB

The Tulip Nebula

The Tulip Nebula in Cygnus - the above image is an H-Alpha / RGB combination with additional support using the H-Alpha as a luminance layer

Sharpless 101 (Sh2-101) is a H II region 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 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. [Wikipedia]

Scope: AP155EDF w 4" Field Flattener and Focus Boss II motorized focuser
Camera: Moravian G4 w Astrodon Gen II filters
Mount: Paramount MX guided w an SBIG ST-402ME and Borg 60mm guidescope
22 x 20 min of H-Alpha
15 x 10 min each of RGB
Acquired with CCD-Commander and TheSkyX
Calibration and colour combine in PixInsight
Further processing including the blending of the H-Alpha into the RGB  in PS CC

Click on any image to see it 2x this resolution and to resize it in the browser.

Here is a more conventional presentation of the HaRGB:

Tulip in HaRGB

And here is the pure RGB:

Tulip Nebula in RGB

Lucknow, Ontario
July 2021

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