Morning Jonathan/all,

It was a frustrating morning here with lots of fast moving cloud and
only a few short gaps. My best images were taken at around 04:00. I get
a total magnitude of 6.9 using comphot on the green pixels of my ASI294
referenced to Gaia DR2. The coma diameter is almost 16 arcmin and the
tail is visible on my image to around 1.5 deg. The image is here:

https://britastro.org/observations/observation.php?id=20211202_102625_1e4f221e76bcaf54

On the morning of November 29 I got 7.2 using comphot and the same
equipment. Thomas Lehmann kindly did a reduction of my images using
AIRTOOLS and got 7.13 (ref APASS) and 7.24 (ref Gaia EDR3) so both
software approaches a producing the same results.

There are quite a few BAA estimates on COBS. Do you want me to download
those for use in your analysis or will you do that?

I also have images with the HD11/IMX455 which I haven't processed yet
but they show a nice, compact pseudo-nucleus so no signs of anything bad
happening to this comet.

Nick.

On 02/12/2021 08:15, Jonathan Shanklin - BAS wrote:
> I observed the comet this morning from central Cambridge.  It was worth getting up early for.  The comet was mag 6.7 in 20x80B at 06:19, with a tail ¾ of a degree long.  It would probably have been more impressive from a dark sky location.
>
> This is about a magnitude fainter than predicted by the magnitude analysis that I ran last month, but within the error bars.  I’ll be updating the analysis later today or tomorrow.  It could brighten by another couple of magnitudes before UK observers lose it around December 11.
>
> Regards,
>
> Jonathan Shanklin
> BAA Comet Section visual observations co-ordinator
> https://www.ast.cam.ac.uk/~jds/
>
>
>
>
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