C/2019_Y4_Atlas 10-04-2020 Coma shapes

[fwm891]

While capturing the comet on the 10th April I watched each (well most!) images on screen zoomed well in and I noticed that the shape of the coma seemed to change even between the two minute subs and pretty well forgot about it until today so I randomly selected four subs from the 40 subs taken and zoomed in again.

I inverted the images as that always seems to show more shape to a comet (or galaxy arms) and used the trace contour tool in Photoshop to outline the coma in each.

All four have had exactly the same levels stretch before being combined on a single image.

Nothing scientific about this - just my curiosity. The comet was imaged at 805mm focal length, longer would have given a better initial scale.

Didn't see any detail in the tail.