This image was taken on 4th March when the sky was super clear!
I have used photoshop to try to bring out the nebulocity in the cluster. The blue glow is caused by gas that is ionised by the hot, blue stars in the cluster. I had to play with this for quite a while because I kept getting a 'ghosting' effect when the 60 images were stacked.
The result is in fact only 7 images @ 45 sec stacked.
Brings out the nebulocity nicely!
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