Jump to content

M106 (LHaRGB) - 12 April 2021


Recommended Posts

After weeks of crap weather or clear skies only when the Moon was up, I finally managed to finish my first image since January. It is an LHaRGB image of the intermediate spiral galaxy M106 in Canes Venatici. I started the project in March in the run up to 1st Qtr Moon, but the ~8 hours of LRGB data that I captured proved unusable, so I shot all that again over the past week, or so. The Ha data captured in March seemed to survive ok despite the bright Moon, so I've used that. Total integration is just over 15.5 hours, comprising L=31x10m, Ha=19x15m, R=24x5m, G+B=22x5m each.

Processing was all done in ImagesPlus, with Registar used to accuratrely align the 5 stacked channel images, before building the final colour image which also done in ImagesPlus.




This was a very tricky image to process, with countless iterations at various stages of the process for both the luminance and colour images, before combining them with 4 completed versions, of which the above is a layered combination of V2 and V4, so really V5....!! I really struggled to reveal the galaxy's outer halo whilst trying to control the noise in the background. I had both more crunchy and much softer versions, but have settled on this combiation one - at least for now.

Thanks for looking.

Edited by geoflewis
replaced image with a blended comination of previous versions
  • Like 8
Link to comment
Share on other sites

1 minute ago, Padraic M said:

That's a great rendition Geof. I particularly like the outer skirts especially to the top left, and the Ha knots really shine. It's a much more extensive galaxy than it seems at first sight.

Thanks Padraic, I appreciate the feedback. It certainly is a much larger galaxy that I thought from my only previous attempt at it back in 2014, with a DSLR camera and 10" Meade SCT. I had to go for a diagnal look to be sure to get it all in - a bit like many (me included) image M31...!!

  • Like 1
Link to comment
Share on other sites

1 minute ago, AstronomyUkraine said:

Very nice image, and not easy to process. It a nice widefield target too, with the other galaxies in close proximity.

Thanks, yes, I wondered whether to shoot it with my 4" APO to get that wider FOV, but I decided just to get up close and personal with M106.

  • Like 1
Link to comment
Share on other sites

2 minutes ago, Bob-c said:

Great image Geof, nicely processed.


Thanks Bob, I apreciate the comments. This was a far trickier target to process than I expected and took me to the limit of, if not beyond, my current skills.

  • Like 1
Link to comment
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.
Note: Your post will require moderator approval before it will be visible.

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.

  • Create New...