M31 Andromeda Galaxy LRGB

[Adam1234]

This has been my first image for a few months, but I was lucky enough to have some clear skies during November/beginning of December, so I set my sights on our neighbouring galaxy M31.

Probably the first attempt at processing this data, this is a 2 pane mosaic in LRGB.

L = 360 x 30s (3hr) per pane

RGB = 60 x 60s (1hr) each of R, G & B per pane.

SkyWatcher ED80, EQ6-R Pro, ZWO ASI600mm Pro. Gain 75. Processed in PI.

 

 

Comments and critique welcome.

Thanks

Adam

 

[Adam1234]

I might try and get rid of that greenish glow on the left hand side

[Laurin Dave]

Very nice Adam,  I'm wondering whether you used the relatively new Normalise Scale Gradient script on your calibrated subs and the Photometric Mosaic script to combine the panels?  If not they're worth trying out as NSG really helps with gradient removal and the PM script is good at producing seamless mosaics.

Dave

[Adam1234]

Thanks!  I've not heard of those scripts, I might give them a look, thanks. 

I used the linearDNA script used in the Trapped Photons mosaic tutorial, and then used Gradient Merge Mosaic to combine the panels. 

[Padraic M]

Very nice Adam, and interesting as it may be a project for me over Christmas with a very similar setup. Are those two frames stitched together in landscape format? That's a good idea.

[Laurin Dave]

GMM has become Photometric Mosaic in the new PI release, it has some worthwhile improvements .  NSG normalises the gradients on each of your subs back to a reference frame (which you choose) and automatically weights them for Integration..  It makes the gradient on the final Integration much easier for PM (and indeed DBE) to deal with.  When combining with the PM script it's worth experimenting with/without DBE on the integrations (I'd just put DBE  point in the very corners) .