[BAA Comets] Sudden changes on C/2019 Y4 (ATLAS)

[Nick James]

Evening all,

I've just started imaging this comet tonight and there is a small 
condensation now right emerging from the front of the extended coma. 
This also appears in Gianluca Masi's image from tonight. Interestingly 
if you do astrometry on this condensation it is within 2 arcsec (just 
under 2 pixels at this scale) of the expected nucleus position based on 
the orbit using data up to March 25.

This is only a short stack. I'll have better data later if the weather 
cooperates.

Nick.

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