A very difficult region containing the CTB1 supernova remnant along with a number of small hydrogen alpha regions, some of which are listed in the Sharpless catalogue including Sh-165 and sh-166. The contrast between the stars and the bubble shaped remnant is very small - ideally this region needs better skies in conjunction with a 3nm filter instead of my wider 6nm filter. I've used data from two nights to complete this image, and discarded a number of brighter frames. Aggressive processing is required to highlight the bubble structure.
Captured in ArtemisCapture, calibrated in ImagetoolsCa, combined in maxim, thuggery in photoshop. Total integration time 9.75 hours
Exposure Details :
Astrodon 6nm Ha 20x900s on 57mm @ F5 with ART285
Astrodon 6nm Ha 22x900s on 57mm @ F5 with ART285
Curdridge Observatory, Southampton,UK