See a high quality version of this dataset on Astrobin, here processed by Gamaholjad and here processed by Turtlecat.
NGC 2359 (Thor’s Helmet) is an emission nebula in the constellation Canis Major. The nebula is approximately 11,960 thousand light years away and 30 light-years in size. The central star is the Wolf-Rayet star. The dataset provided has both Narrow Band and RGB. The SII signal is somewhat weak, and in fact I prefer the version processed without it (above). The RGB data is cluttered with stars, which I did not try to reduce. Maybe someday…
