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_dslr_mirrorlesss_winners.thumb.jpg.9deb4a8db27e7485a7bb99d98667c94e.jpg

Jannis

Trapezium Cluster in M42

Recommended Posts

Finally got done stacking the few hundred frames, aligning them, and processing them for the high dynamic range. Then came a nightmare - registar was unable to align my channels... :BangHead:
Well, after 2-3 hours i finally got them all aligned, just to find out the OIII really did more bad then good, so i dripped it and went for a bicolor instead to get more details.
It don't look too good in high/full res, especially as I've used 3x drizzle, but for this little data, manual alignment, and my poor tracking - I'm quite happy. :)

The image was captures with the Polemaster on the Explorer 200 guided by the QHY5L-II. And the bicolor consists of NIR and Ha data instead of the usual Ha and OIII.

NIR data is from 742nm and 23x 60sec, 59x 5sec, and 172x 1sec.
Ha data consists of 18x 30sec and 100x 1sec.
Total exposure is a low 41 min 45 sec, with a total of 372 frames.

NIR 23x 60 sec gain 30 dark bias v1.jpg

NIR-Ha bicolor-crop SGL.jpg

Edit: I just realised i posted this in the wrong section, if a mod could move it to deep sky i'd be thankful. 

Edited by Jannis
  • Like 3

Share this post


Link to post
Share on other sites

Interesting! Which channel is the monochrome one? Do you mind sharing both channels? The Ha and the NIR? Are there big differences between them?

Clear skies,

Alex

Share this post


Link to post
Share on other sites

Sorry, my bad. The mono channel above is the NIR channel. There may not be much difference in terms of what part of the nebulosity showing up, but it's for sure more faint in the NIR, but it shows a lot more stars then the Ha.
The unprocessed NIR data is available here, should anyone be interested: https://www.dropbox.com/s/f0x3gxiw5nyyndt/M42 Polemaster NIR 742nm.rar?dl=0

This is the Ha channel: 

Ha 18x 30 sec 13 gain dark bias.jpg

  • Like 1

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 MarsG76
      The Orion Nebula imaged in RGB through a Celestron 8" SCT at F10 (2032mm FL) using a full spectrum modded and cooled Canon 40D. Tracked using a Celestron CGEM mount. Total exposure time was 1 hour and 24 minutes.
    • By MarsG76
      Hello All,
      I was wondering whether it's possible to image a DSO and capture any depth. Every 3D astro image online is faked so at the start of the year, I decided to image M42 six months apart.
      Back in March I posted a image of M42 imaged at f10, 2032mm FL through my 8SE on 28th February 2019. Than on 3rd September (setup and captured 15 second subs on 1 September) I captured M42 at the same focal length, same orientation and very similar subs for a total exposure of 1 hr 24 minutes. This was almost to the day exactly 6 months between the two images, so the earth was 300 million km away from the original position on the other side of the sun, furthest I could hope for imaging a 3D stereo pair.
      First attached is the image from September...

       
      I color matched the above image with the image from February, aligned them and below is the end result....

      As you can see there is no detectable 3D effect... There was a 3Dish effect but this was most likely due to the differences in processing of the two stacks and when I SCALE and rotate the two images to align them, and hence no 3D effect.
      Of course the stars and nebula are certainly not on a flat plain so I believe that the reason for the lack of any discernable depth is simply due to the distance of M42 resulting in  a very small angular shift in the stars, so small in fact, that it’s beyond the sensitivity of my 8” SCT, camera pixel resolution and tracking accuracy of the CGEM.
      Calculation of the expected motion of any parallax shift when the Orion Nebula is 1344 lightyears away and the distance of Earth being 149,600,000km from the Sun:
      1344LY = 1.2715e+16km
      Θ° = Tan-1(149.6e+6/1.2715e+16)
      Parallax Shift Θ” = 2 x 3600 x Θ
      Parallax Shift Θ” = 0.0048536712567150
      An angular motion of 0.005” was not picked up by my system that tracks with an average accuracy of about 1” RMS, with a camera sensor that has a resolution of 1.16”/pixel at 2032mm focal length with a 8” SCT. Even if I could get consistent tracking at the best accuracy that I have ever seen with my gear, 0.38” RMS, this is still well above 0.005” and well beyond the 40D sensor pixel resolution, and all this is without considering atmospheric distortion, obviously my setup is not even close to sensitive enough.
      This was a good project but unfortunately the distances of objects in the universe are too great, even objects classed as in our celestial “backyard”. If I didn’t try this experiment than I would be always wondering and curiosity would most likely make me try it eventually.
       
      Clear Skies,
      MG
       
       
       
    • By MarsG76
      This exposure of the Orion Nebula region is really just a quick and lazy session since I didn't want to waste a clear night by doing nothing and the scope was already setup and focused so I wouldn't be spending much time on setup. I also didn't have a plan for imaging another object it seemed like a good idea being a bright and easy object to image.
      I already imaged this object in the past, but by comparing the setup, procedure and improved tracking accuracy of the past together with the now cooled 40D, I know that the result would have been an improvement if I would have dedicated the necessary exposure time, through the necessary NB filters.
      This image all consists of RGB/OSC, IRCut filtered, 31x15s, 32x30s, 16x60s, 10x90s, 11x120s ISO1600 subs. 
    • By rotatux
      My first HDR.
      Capture: Olympus E-PL6 on Skywatcher 130PDS at 590mm/4.55 with SW CC and dydimium filter on Omegon EQ-300 tracking RA
      Exposure: 19 × 10s × 2000iso + 10 × 30s × 3200iso + 6 × 60s × 2500iso (total 14mn10s)
      Site: 50km from Paris (France), Bortle ~ 4
      Processing: Regim 3.4, Fotox 12.01+
    • By MarsG76
      Hello astronomers,
      This exposure of the Orion Nebula region is really just a quick and lazy session since I didn't want to waste a clear night by doing nothing and the scope was already setup and focused so I wouldn't be spending much time on setup. I also didn't have a plan for imaging another object it seemed like a good idea being a bright and easy object to image.
      I already imaged this object in the past, but by comparing the setup, procedure and improved tracking accuracy of the past together with the now cooled 40D, I know that the result would have been an improvement if I would have dedicated the necessary exposure time, through the necessary NB filters.
      This image consists of all RGB or OSC (through the IRCut filter) 31x15s, 32x30s, 16x60s, 10x90s, 11x120s ISO1600 subs. 
      I am not prepared to spend subsequent nights capturing narrowband subs on "Orion's Sword", at least not this year... perhaps next time M42 is in the sky and only if I reach near freezing temperature cooling on my sensor.
      Clear skies,
      MG 
       

×
×
  • Create New...

Important Information

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