02 September 2019
Supernova Remnant Sh2-221


By  Ron Brecher
astrodoc.ca )

In addition to Sh2-221, this image shows Sh2-217, on its own at lower right, and smaller Sh2-219 tucked up against the bottom right of Sh2-221. The dark nebula Barnard 25 is at lower left, beneath the two bright stars. The field is littered with faint galaxies, but they are extremely difficult to see in the crowded star field.

Moravian G3-16200 EC camera (on loan from O’Telescope), Optolong Ha, O3, R, G and B filters, Takahashi FSQ-106 ED IV at f/3.6, Paramount MX, QHY5 guide camera, 175mm f.l. guide scope. Acquisition with the SkyX, focused with FocusMax. All pre-processing and processing in PixInsight. Acquired from my SkyShed in Guelph. No moon for Ha and O3, crescent moon for RGB, average transparency and seeing.

5x10m R, G and B; 10x20m Ha and 8x20m O3 unbinned frames (total=8hr30m).



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