I've just (July 21, 23:20 UTC) managed to image it through hazy cloud
here at 970 and I get a total magnitude of 11.8 with a roughly circular
coma of diameter 26 arcsec. The image FWHM is 2.5 arcsec.

The image is here:

https://britastro.org/observations/observation.php?id=20230721_232012_f5b4a3cb5e9dfe31

Nick.

On 21/07/2023 01:11, Peter Carson wrote:
> Hello all,
>
> My measurement of 12P/Pons-Brooks this evening at 2023-07-20.93  gives mag 11.61
> in a 0.56 arcminute radius aperture against Gaia G using Comphot photometry
> software. It was mag 16.9 on 2023-07-16.02.
>
> My image is herehttp://www.astromania.co.uk/12P_20230720_2219_PCarson.jpg
>
> Peter
>
> Peter Carson MPC Z10
>
> Remote observatory in Extremadura, Spain
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986>  for Windows
>
> *From: *Francois KUGEL<mailto:fkugel@free.fr>
> *Sent: *20 July 2023 23:42
> *To: *comets-ml@groups.io<mailto:comets-ml@groups.io>
> *Subject: *[comets-ml] 12P/Pons-Brooks in outburst!
>
> Hello all,
>
> Confirmation of a big outburst mag 11.6 of 12P/Pons-Brooks
>
> discovered this evening by Elek Tamás , Harsona Observatory, Nyiregyhaza - Hungary.
> Last night 2023-07-19.8 it was mag 16.6.
>
>
> Congratulations to Elek Tamás!
>
> my image and measurement here :
>
> https://lesia.obspm.fr/comets/lib/display-obs1.php?Num=27268
> <https://lesia.obspm.fr/comets/lib/display-obs1.php?Num=27268&fbclid=IwAR2OG87xJMXde432nbougBObRT9LBrs3Kn6y5LX233ID2OkT7BaJ3hhDmZM>
>
> Francois