Hi all, I use to post on the deep sky section but this time I believe the image belongs to this section
I have also imaged the the encounter of C/2013A1 Siding Spring with 47 Tuc from my remote observatory in Coonabarabran:
Comet Siding Spring and 47 Tucanae encounter
I took several short images (2 mins) through my LRGB filters and than I properly combined the frames to get two different sets: one having only the comet (I used the comet's core as alignment reference, basically rejecting the stars using a sigma clip combining) and one having the star field with the path of the comet stretching the whole sequence. The night before I had taken some long exposures of the area to have a good quality LRGB stack of the cluster and so I sandwiched all these images together precisely aligning the comet image on the beginning of the comet path. I than removed the comet trail and got the image posted. It is not what can be called a single shot image but I am quite happy with the result
Hope you will like it
Clear skies
Marco
http://www.glitteringlights.com