Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_globular_clusters_winners.thumb.jpg.13b743f39f721323cb5d76f07724c489.jpg

The-MathMog

Sunflower Galaxy Debut

Recommended Posts

I'd been struggling with gettings subs longer than 60 seconds unguided, as I had to throw away over half of them. I suspected that it was due to periodic errors with the gears or similar with my Celestron AVX. I am using a 2.25 barlow, so my 130slt OTA was very prone to small errors. I looked into doing PEC training, and performed that on this night, and oh holy grail if that didn't produce miracles! I had only done two trainings and averaged them, and I then went from doing 60 second subs, and throwing half of them away, into doing 180 seconds unguided subs without hardly throwing any of them away! This really made me grin like a maniac that night, as it was just like flicking a switch and everything worked perfectly!
So I immediately went to shoot a new target, which became M63. I had looked for galaxies to photograph and this one looked very appealing to me, from the images I found. I ended up gathering a total of 42 subs (+ the ones I ended up throwing away due to satellites, focus slip, dew on secondary etc), and 25 subs! There is still a lot of aspects I can improve on, but the simple fact that my capabilities took such a leap on one single night, simply amazed me, and definitely made up for the weeks on end that it has been cloudy/too windy! My polar alignment was very good that night, so I could probably have pushed it more, but I thought I should rather stay safe, and learn gradually.
Processing is also something that still needs quite a bit of practise. I did like 5-6 versions of this one, and this is the one I liked the best of them.

42 Subs
180s Exposure
2 Hours 6 Minutes light data
25 Darks
Iso 6400
Celestron SLT 130 OTA + Celestron AVX Mount
Baader 2.25x Barlow
Nikon D5200
Nikon Backyard, Stellarium, Photoshop CS2

M63-24-04-Process-3.png

Edited by The-MathMog
  • Like 6

Share this post


Link to post
Share on other sites

Thats a really nice capture there!

Quite sharp and lots of details, especially when concidering the relatively short total exposure and equipment used (and even unguided if i understood well?)! :)

Edit: I think you've also managed to just capture the Supernova 2017dfc! :)

Edited by Jannis
Supernova info
  • Like 1

Share this post


Link to post
Share on other sites
9 hours ago, Jannis said:

Thats a really nice capture there!

Quite sharp and lots of details, especially when concidering the relatively short total exposure and equipment used (and even unguided if i understood well?)! :)

Edit: I think you've also managed to just capture the Supernova 2017dfc! :)

Thanks a lot, still a long way to go with both capturing and processing but it's getting there! :)

Weather have been terrible for months now here in Denmark, so I am lucky I even managed to get two hours. If it isn't cloudy, it is too windy. But there seems to be a few nights coming up, so I might add more data to it there. Better take the opportunity before the "astro dark" disappears for good until August, which happens in a few weeks :/

Yes, it is unguided. Before I did the PEC training, as mentioned even getting 120s subs was almost impossible. The Celestron AVX "ASPA" seems like a very powerful tool too if you do it several time. I tend to check with a drift align afterwards too, but normally I don't have to make adjustments for these exp lengths :)

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By wimvb
      This will be my last image this season. The moon is all too bright atm, and astro darkness ends in a few days.
      This image was a real challenge, both in acquisition and in processing. I haven't completely tamed the MN190 yet, collimation is still a bit off. Visually it looks ok, but when I start imaging, I get star shapes that suggest that collimation is still way out. First I thought that it might be the addition of an oag to the imaging train that was the cause of it all, but I've now come to the conclusion that it actually is collimation.
      Anyways, the details:
      MN190 on AZ-EQ6 ZWO ASI174MM-Cool at -20 C with ZWO filters Guiding was a mixture of ST80 guidescope, OAG (the new ZWO version), and finder guider (9x50) with PHD2 L. 92 x 2 minutes, gain 20, collected April 15 under a 70 % moon R, G: 30 x 4 minutes each, collected March 31 and during two nights in April B: 22 x 4 minutes, collected March 31 and during one night in April Processed in PixInsight

      Larger version is here:
      https://astrob.in/402098/0/
      If anyone wants to have a go at LRGB processing, here's the raw data. Only crop and DBE applied. Have fun!
      M63_R.tif
      M63_B.tif
      M63_G.tif
      M63_L.tif
       
    • By CKemu
      TECHNICAL: R 20x480s | G 20x480s | B 20x480s | Artificial Flat Frame | ATIK414ex, Baader RGB filters, ASI120mm guiding though PHD2 | Meade LX90 8" SCT reduced to f/6.3
      Recently moved to a small beach/hamlet near Looe in Cornwall, and despite a street lamp being 15m away from my imaging spot, the skies here are significantly dark than any where else I have lived, so thought I'd try them out with a galaxy broadband image. Needless to say, I am looking forward to more clear nights!

      I tried making flat frames via the dusk light method, and no matter how little or much exposure I gave the image, DSS made the edges glow and the image extra noisy, not sure what I am doing wrong, so used the artificial flat frame method, which works well enough, just a bit more time consuming.

      I haven't imaged galaxies regularly, indeed, this is my fourth attempt at such an object and I need more practice, I got more data, indeed got 30xchannel in the end, but somehow couldn't get back to this colour balance and detail, so kept the smaller data set version.

      Anyhow, thanks for looking, really do love galaxies!
    • By alan4908
      An LRGB image of the Sunflower galaxy. The image was taken with my SW Esprit 150 and SX Trius 814 camera and represents just over 10 hours integration time.
      I gave the very bright stars near the galaxy a very modest stretch and then blended this result with the result of the more highly stretched galaxy image. This approach generated some star colour and also reduced their distraction effect, in addition, it also allowed some faint nebulosity that surrounds the galaxy to be displayed.
      The image was processed with my normal workflow which uses three software packages:
      CCDstack: calibration, stacking & error rejection, Lum deconvolution and DDP stretch, RGB combination Photoshop: mask generation(s), High Pass Filter, colour enhancements, noise reduction Pixinsight: gradient reduction (DBE), Photometric colour calibration, green reduction (SCNR), noise reduction (TGVDenoise), sharpening (MLT). The image was previously posted in the Deep Sky imaging section.
      Alan

      LIGHTS: L:11, R:19, G:15. B:17 x 600s, DARKS:30, FLATS:40, BIAS:100 all at -20C.
       
    • By alan4908
      First go with my Esprit 150 at M63. I particular like the galaxy colours and I was pleased to capture some of the surrounding nebulosity. The image is an LRGB and represents about 10 hours integration time.  A corresponding image within my Deep Sky II album was taken with my ED 80.
      LIGHTS: L:11, R:19, G:15. B:17 x 600s, DARKS:30, FLATS:40, BIAS:100 all at -20C.
    • By alan4908
      My first go with my Esprit 150 at the Sunflower galaxy.  The image is an LRGB composition and represents just over 10 hours integration time. 
      Post processing followed by normal workflow with the exception that I found that the very bright stars required special attention to keep them under control. 
      Alan 

       
      LIGHTS: L:11, R:19, G:15. B:17 x 600s, DARKS:30, FLATS:40, BIAS:100 all at -20C.
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.