Peter,

Thanks. That is a really nice image showing a very interesting third
"horn" in the dark band.

The coma continues to expand and my expansion plot so far is attached
including your very early image. This has a best linear fit expansion
rate of 13.25 arcsec/day which corresponds to around 190 m/s. If other
observers would like to add their coma diameter estimates to this plot
please send them to me.

My latest image from Chelmsford is here:

https://britastro.org/observations/userimg/20230726_011753_5cb6f1d582ec.jpg

Nick.

On 25/07/2023 20:16, Peter Carson wrote:
> Hi All,
>
> Here’s a link to my image of 12P Pons-Brooks taken earlier this morning.
>
> http://www.astromania.co.uk/12P_20230725_0018_PCarson.jpg
>
> There seem to be brighter features developing in the coma, particularly around
> and in the dark “notch”.
>
> My previous images are here http://www.astromania.co.uk/comet_12p_ponbrooks.html
>
> Peter
>
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