Sh2-22 in RGB Ha

Sh2-22 is also known as GUM 71 or RCW 144. This is a ring nebula surrounding the O8 III giant 63 Ophiuchi. Most published images don't appear to reveal the full extent of the nebulosity surrounding this star, something which I have attempted to do in this HaRGB version

 

Total integration: 4h 40m

 

Integration per filter:

- Hα: 3h 40m (22 × 600")

- Multiband: 1h (12 × 300")

 

Equipment:

- Optics: Sharpstar Z4, William Optics Redcat 51

- Cameras: ZWO ASI533MC Pro, ZWO ASI533MM Pro

- Mounts: Sky-Watcher HEQ5, ZWO AM3

- Filters: Antlia 3nm Narrowband H-alpha 2", Optolong L-eXtreme F2 2"

- Accessory: ZWO ASIAIR Plus

- Software: Adobe Photoshop, Aries Productions Astro Pixel Processor (APP), Pleiades Astrophoto PixInsight, ZWO ASIAIR

 

Ha and RGB versions processed separately; starless Ha layered on RGB with stars in Photoshop and processed as recommended by Andy Campbell in his Photoshop Secrets eBook

Done