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.



Eagle and Swan in H-Alpha (M16, M17, M18)

Recommended Posts

Managed a bit of further processing on data captured on holiday - this field of view is something I would really struggle with at home (it's 9 degrees lower, and doesn't rise above my roof from my garden!) - a widefield of the Eagle (M16), Swan/Omega (M17) and M18, as well as a lot of HII in the surrounding areas. The HA filter helped a lot in cutting through the atmosphere - it's not fantastically high from the site we were at, and I still had to have a couple of nights at it dodging the trees.

QHY163M + Canon 200mm f2.8L (@f3.85) + Baader 7nm HA filter, mounted on a Losmandy GM8.
Exposure 2h50m in 5min subs. Binned a few subs as they were of poor quality. 

Processing in PI. Thanks for looking :)

At 50% resolution:


Partially annotated version (lots of unmarked catalogues not shown, and not sure why Sh2-47 is marked away from the actual object! :



Edited by coatesg
  • Like 8

Share this post

Link to post
Share on other sites
40 minutes ago, tooth_dr said:

Holy macaroni I’m glad I opened this thread. Stunning image

? Thanks! Was just glad to be able to get that low in declination!

Share this post

Link to post
Share on other sites

I have a 105mm F2.8 and an adapter for my CCD so this is great inspiration to get my ass in gear and try it out. 

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.

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
      Hello Astronomers,
      Adding my latest image to the comp. This is the Swan (or Omega) nebula imaged during multiple nights between 28 July - 8 August 2019 with my Canon 40D DSLR through my 8" SCT at F10, 2032mm focal length. Imaged in narrowband through Baader SII, HAlpha and OIII filters and combined as SHO (Hubble Palette) colour.
      Total exposure time was 27 hours.
      HAlpha Subs are 10 & 15 minutes long, OIII subs are 15 & 20 minutes and SII subs are all 30 minutes so I had to spend at least 2 whole nights per filter, except in the case of SII which was 3 nights. The amount of time it took to gather the subs wasn't crucial since I have a permanent setup and resuming exposures night to night took about 10 minutes, and I wanted as many subs as possible to keep the noise level to a minimum, and to be honest I could just keep on adding subs for as many nights as M17 was in the sky on moonless nights but I find that more than 40 subs per channel on brighter objects seems to have diminishing returns.
      Gathering more and more subs is made it easy when we're in a drought and there are hardly any clouds in the sky, mostly dry and cloud-free nights lately, which allowed me to have 100% successfully exposed subs.
      All subs are ISO1600 and the active cooling definitely helps with the noise levels, most noticeable with SII when comparing to my SII 1800 second subs captured in the past.
      Clear skies,

    • By MarsG76
      Hello all,
      Sharing with you my finished image of the Swan nebula imaged through SII, HII and OIII narrowband filter using my modded and cooled Canon 40D. Imagd trough my C8" SCT at 2032mm focal length.
      Total exposure was 27 hours across multiple nights.
      Clear Skies,

    • By MarsG76
      Hello Astronomers,
      This is a work in progress, I'm spending my clear moonless nights capturing narrowband data of M17, at 2032mm focal length through my 8" SCT, using my Cooled and modded 40D.
      I still have SII to capture to complete the project but for now I played with the data I already have.
      As it turns out that both the HAlpha and OIII subs have a considerable amount of blue data in them, separated due to the DSLR being a OSC camera, so I used the red out of the HAlpha image, green from OIII green channel and added the blue from HAlpha (the Hbeta data) and blue from the OIII stack and used it as the blue channel, resulting in a almost natural color pseudo RGB image, attached.
      Once I have the SII data, I'll assemble the channels into a SHO narrowband image of M17.
      Clear skies,

    • By Mandy D
      I've just bought a Daystar Solar Scout 60mm DS for H-alpha imaging of the Sun. I am now looking for a suitable camera to use with it. I know I could use my DSLR, but for H-alpha that is not going to give best results, so am looking for a dedicated monochrome imaging camera. I have identified the ZWO ASI178MM as a possibility that fits my budget and has a large enough (I think) sensor to image the entire Solar disc if I use a 0.5 focal reducer which will give me a total focal length of 465 mm.
      Does anyone have any experience of this camera in this application, or know if it will be suitable? I know it does not have an IR blocking filter, which I understand is an advantage for H-alpha. The spec is available here:
    • By Adam Barnsley
      Hi all.
      I am looking for a zoom eyepiece to 60mm lunt. My first choices are Lunt zoom and Pantax smc xf zoom. Which will work better? Can you have any other offer? You could say something more about these eyepieces while observing h-alpha? 
  • Create New...

Important Information

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