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

[Nick Haigh]

Hi all, I took these images this evening with a 610 baader longpass (as full moon) coveing 6820secs of 10sec subs.

Clearly show breakup of the nucleus - or at least several condensations, to be interpreted somehow!

Image 6.2' wide - ive upsampled it 2x to make it clearer. Original resolution 0.72"/pixel, so ~1.44"/pix here.

Cheers

Nick
________________________________
From: Comets-disc <comets-disc-bounces at lists.britastro.org> on behalf of Nick James <ndj at nickdjames.com>
Sent: 06 April 2020 21:26
To: BAA Comets discussion list <comets-disc at britastro.org>
Subject: Re: [BAA Comets] Sudden changes on C/2019 Y4 (ATLAS)

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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