Around six days since 12P had a double outburst the inner coma diameter
is around 2 arcmin. The attached image was taken earlier this evening.
The comet shows interesting structure in the coma with rays either side
of a darker region and a bright lump of material lto the east of the
photocentre. Note also that the expanding coma is not exactly circular.
I have not seen this before and I assume it is the effect of solar
radiation pressure on the dust cloud but I need to check the geometry.

I get a total magnitude of 10.9 including some of the faint outer coma.

Pleaes keep an eye on this comet whenever you get a chance.

Nick.

PS - Richard sent some images obtained using larger telescopes a few
days ago but these got stuck since the exceeded the maximum file size
limits. I have just released them.

On 31/10/2023 19:15, Nick James wrote:
> Denis Buczynski, Tarbatness, reports that 12P is in outburst again. He
> gets a g magnitude of 12.9 from an image taken at Oct 31.76. Francois
> Kugel also reports the outburst at Oct 31.74.
>
> Richard Miles reports that the Comet Chasers group have a measurement of
> 15.87G at Oct 31.19.
>
> If you have any observations between these two times please report them
> to the section.
>
> Nick James. Director.
> To unsubscribe from this list please go to
> https://www.simplelists.com/confirm/?u=Aj4vCBHI6JSRpYRB2DWvMTYlWL2vuAnC