Hi all,

Here's a plot of my magnitudes from tonight and it shows that the comet
is stable at its new brighter state. The two comet magnitude values are
both with a 5.4 arcsec radius photometric aperture but in one case (the
purple line) the sky estimate area is outside of the diffuse outer coma.
In the other case (green line) it is adjacent to the aperture and thus
polluted by the coma. Since, in this latter case, the sky appears
brighter the comet magnitude appears to be fainter. This matches the way
that Astrometrica does its sky estimate and the green points are similar
to what I get from Astrometrica.

Nick.

On 23/11/2021 21:32, Richard Miles - rmiles.btee at btinternet.com (via
baa-comet list) wrote:
> That all make sense Nick.
>
> There appears to have been a 0.35 mag amplitude outburst at
> 2021 11 23.24 +/-0.08  16.25R => 15.90R
>
> Peter Carson imaged on 2021 11 22.94 at 16.26R
> Patrick Wiggins imaged at 2021 11 23.14 at 16.28R
> LCO 2.0-m image at 2021 11 23.35 at 15.86R
>
> Further observations will help firm up the amplitude of this mini-outburst.
>
> Richard