Welcome to Starship Asterisk*, Franceso! Nice image!fmeschia wrote: ↑Sat Jul 20, 2019 6:17 pmMy image captures the molecular cloud LDN 1235, also known as the Dark Shark Nebula, in the constellation Cepheus. This cloud captures the viewer’s attention for its remarkable shape, while showing examples of dark absorption nebula, bright reflection nebula, and extended red emission nebula.
For this image I integrated 19 sub-exposures, each 480 second long, via a 65 mm f/6.5 apochromatic quadruplet astrograph, with a Nikon D5500 DSLR (modified to let H-alpha radiation reach the sensor) from a dark site (SQM 21.7 mag/arcsec2). Each sub-exposure was calibrated with bias frames, dark frames and flat frames, and the 19 sub-exposures were stacked together. The stack was then processed using PixInsight and StarNet++.
LDN 1235, the Dark Shark Nebula
https://www.flickr.com/photos/frankz/48 ... ed-public/
Copyright: Francesco Meschia