Jkulin Posted November 21, 2020 Share Posted November 21, 2020 Well I hope you have your sunglasses on, well it is nearly Christmas, here's my version of Sh2-185 - The Ghost of Cassiopeia created in a HOS Pallet with RGB Stars.So if you are a Vivian Westwood lover then this might appeal :-)What a very strange object to process, when I first combined in SHO, i has a green nebula and no matter how much I tried it was proving very difficult to remove and let thing look natural. I tried in a number of alternative combinations and finally settled on this.I found it wouldn't accept MLTNR noise reduction but would accept TVGNR, the RGB for the stars was fairly easy, thankfully.10.3hours in totalGSO/Altair RC10"/F7.9, iOptron 120EC, Moravian G2-8300 MkII, Pegasus UPB, 2" Chroma Filters, Ultrastar Guide Camera, QHY OAGMore Info here: - https://www.astrobin.com/kmjr6y/Here's the Bumf for those interested: -IC63 (the bright, pointed object) and IC59 (the weaker object) are commonly called Sharpless 2-185 (Sh 2-185). Both are illuminated by the B0 IV star Gamma Cas. Both nebulae are near this ionizing star, but have very different visual appearances. IC63 can be described as a "comet cloud", refers to gamma cas and is narrower and sharper defined than IC59. Spectral measurements indicate that IC59 at 590K is slightly cooler and less dense than IC63 at 630K. Both are not separate nebulae, but part of a much larger nebulous region surrounding Gamma Cas. Both nebulae have spectroscopic mid-infrared detections of molecular hydrogen and polycyclic aromatic hydrocarbons (PAHs).Experts are discussing whether the H-a signal we capture in our images is actually an emission from the nebula, or reflection of the H-alpha light emitted by Gamma Cas, which is scattered by the dust in IC59 and IC63. This light scattering and reflection is called ERE (extended red emission). Gamma Cas is the prototype of a B0 IV star that emits significant H-alpha light. As it is slightly cooler than a BO V star, it can only slightly ionize molecular hydrogen in its environment. Thus it is possible that the H-alpha we capture in our images is a mixture of both processes: direct H-a emission from ionization and ERE.https://cdn.astrobin.com/thumbs/-ghKiQe9epH-_1824x0_4udRqQyL.jpg 5 Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.