Hello
I completed this one a few days ago but only had a chance to finish processing it last weekend. It is the Coma (Galaxy) Cluster in Coma Berenices. The largest centre elliptical galaxies are NGC 4874 and 4889. Over 9,900 objects (non stars) are visible in the LRGB frame. Check the annotated versions (one without PGC galaxies to see the NGC objects alone):
https://www.astrobin.com/ly2kkh/E/ (https://www.astrobin.com/ly2kkh/E/)
Some IFN seems to be visible in both the L and (by construction) in the LRGB images.
A total of 18hrs of integration: 9hrs in L and 9hrs in OSC RGB through my tandem setup.
There's a galaxy within this cluster that has an extremely active galaxy nucleus: http://simbad.cds.unistra.fr/simbad/sim-id?Ident=%402031857&Name=Mrk%20%20%2060&submit=submit (http://simbad.cds.unistra.fr/simbad/sim-id?Ident=%402031857&Name=Mrk%20%20%2060&submit=submit)
Check these amazing pictures from Hubble: https://hubblesite.org/contents/media/images/2019/05/4285-Image.html (https://hubblesite.org/contents/media/images/2019/05/4285-Image.html)
And combined from Hubble and Subaru: http://www.sci-news.com/astronomy/spiral-galaxy-d100-ram-pressure-stripped-tail-06851.html (http://www.sci-news.com/astronomy/spiral-galaxy-d100-ram-pressure-stripped-tail-06851.html)
Roberto
L only
(https://cdn.astrobin.com/thumbs/sBrRSFjWSBTG_2560x0_0nse9Boz.jpg)
LRGB
(https://cdn.astrobin.com/thumbs/zdiEvTN8dzZu_16536x0_85166Htd.jpg)
And one of the annotated versions showing all the background galaxies:
(https://cdn.astrobin.com/thumbs/8Pnv5gvf3g0B_16536x0_85166Htd.jpg)
Wow just a few Galaxians then....Lovely FOV.
Roger
I do like a galaxy cluster, they are so unbelievable, all those trillions of stars! Very nice Roberto.
Lots of galaxies in there! I find images of galaxy clusters to be quite awe-inspiring.