I think we can safely say that C/2019 Y4 will soon be redesignated
D/2019 Y4. It faded another 0.5 magnitudes from May 15.9 to 16.9 and
there is no photocentre left for astrometry. All that we see now is two
fading trails of debris.
It is a very challenging target now as it dives towards the northern
horizon but please keep imaging it if you can.
Nick.