cuivenion Posted February 12, 2019 Share Posted February 12, 2019 This was taken over two nights in January from my backyard in Morecambe. I was uncertain as to wether to use all the data as one night the seeing was fantastic, the other not so good, plus I didn't dither on the bad seeing night. I might have another go with just the data from the better night. Scope: Skywatcher 130PDS Mount: Skywatcher HEQ5 Imaging Camera: ZWO ASI224 Guiding: Finderguider with GPCAM AR0130C Software: Sharpcap 3.2, PHD2, Deepskystacker 4.2, Pixinsight 6 Hours 30 minutes of 30 and 49.2 second exposures 100 Darks, 200 Flats + Dark Flats per night Any comments and constructive criticism welcome as usual. Link to comment Share on other sites More sharing options...
tomato Posted February 12, 2019 Share Posted February 12, 2019 A great result! I’m currently trying to image a wider FOV of this galaxy encompassing NGC 4217. So far I have around 3 hours of subs, but I definitely need more data to get closer to the level of detail in your image and a similar smooth background. I am going to struggle now with the moon getting big and high in the sky. I’d be very interested to see how a process of your data from the better night comes out. Link to comment Share on other sites More sharing options...
cuivenion Posted February 12, 2019 Author Share Posted February 12, 2019 Just now, tomato said: A great result! I’m currently trying to image a wider FOV of this galaxy encompassing NGC 4217. So far I have around 3 hours of subs, but I definitely need more data to get closer to the level of detail in your image and a similar smooth background. I am going to struggle now with the moon getting big and high in the sky. I’d be very interested to see how a process of your data from the better night comes out. Thanks, it's a more difficult target than I gave it credit for. The outer arms are very faint compared to the center, good luck with your version. What camera/scope are you using? Link to comment Share on other sites More sharing options...
tomato Posted February 12, 2019 Share Posted February 12, 2019 Yes, I totally agree with your observation about the faintness of the outer arms, I have to stretch the data hard to bring them out. I have a Moravian G2-8300 on an Esprit 150, could get a clear spell here on Thursday, however the moon will be at 72% and 42 degrees elevation, but I’ll try and get some more subs. Link to comment Share on other sites More sharing options...
cuivenion Posted February 12, 2019 Author Share Posted February 12, 2019 Nice kit, looking forward to seeing the results. Link to comment Share on other sites More sharing options...
wimvb Posted February 13, 2019 Share Posted February 13, 2019 Lovely image. Did you use deconvolution? This may reveal more structure and contrast in the core. Link to comment Share on other sites More sharing options...
cuivenion Posted February 13, 2019 Author Share Posted February 13, 2019 Thanks wimvb. I did use deconvolution but I'm still getting my head round it. I made a PSF and applied it at the linear stage and that's the result. I may be better off using slight sharpening instead. There's not that many stars in the fov so maybe the PSF model isn't great. Link to comment Share on other sites More sharing options...
wimvb Posted February 13, 2019 Share Posted February 13, 2019 I think there are enough stars. If you aim at selecting stars that have a moffat profile and an amplitude between 0.1 and 1, you should be ok. In deconvolution, it's important to keep the dark deringing parameter as low as possible, otherwise there won't be much sharpening. The default value of 0.1 is usually waaaay too high. Link to comment Share on other sites More sharing options...
cuivenion Posted February 13, 2019 Author Share Posted February 13, 2019 Cheers I'll give it a try. Link to comment Share on other sites More sharing options...
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