<div dir='auto'>Hi Nick,<div dir="auto"><br></div><div dir="auto">It's raining here 😔 but...<br><div dir="auto"><br></div><div dir="auto">I have a run of observations set up using the LCO 0.4 telescope network. I haven't had chance to analyse yet, but if you want to take a look the data are publicly available here https://archive.lco.global/?q=a&RLEVEL=&PROPID=&INSTRUME=&OBJECT=Y4&SITEID=&TELID=&FILTER=&OBSTYPE=&EXPTIME=&BLKUID=&REQNUM=2099868&basename=&start=2014-01-01&end=2020-06-30%2023%3A59&id=&public=true</div><div dir="auto"><br></div><div dir="auto"> I set up one run a day (3x120 for rp and gp) for a week, so hopefully 3 more nights to come. I can set up more/alternative observations if you think they would be helpful? (Cv19 permitting..)</div><div dir="auto"><br></div><div dir="auto">Best wishes</div><div dir="auto">Helen</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 5 Apr 2020 22:33, Nick James <ndj@nickdjames.com> wrote:<br type="attribution" /><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Recent astrometry shows significant residuals in RA indicating a fairly
<br>
large non-gravitational force (NGF) acting on the comet nucleus. The
<br>
attached plot shows the RA residuals using an orbit solution which uses
<br>
observations up to March 25. These fit weel without any NGFs. The NGFs
<br>
seem to start after this date. My astrometry from tonight shows that
<br>
nuclear magnitude of the comet is around a magnitude fainter than on
<br>
March 25 and that the PSF is a lot broader.
<br>
<br>
The sudden onset of significant NGFs may indicate that the nucleus is
<br>
very small and is in the process of breaking up or it may simply
<br>
indicate a significant release of material from an otherwise intact
<br>
nucleus on or around March 27. Only observations will confirm this.
<br>
<br>
Astrometry can be performed during strong Moonlight so please observe
<br>
this comet as much as you can and send me any astrometry that you obtain.
<br>
<br>
Nick James.
</p>
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</blockquote></div><br></div>