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

[Nick James]

As of this evening (April 6) my astrometry now shows a residual of 6 
arcsec in RA (approx in the direction of the tail). I've plotted the 
brightness profile of the comet in a slice through the nucleus and 
parallel to the tail for three dates, 2020 March 31, April 5 and April 
6. The peak brightness is falling and the inner coma is broader in the 
tailward direction. All of this implies this comet may not last much 
longer. I hope I'm wrong but observe it while you can!

Nick.
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