Further to my note of three days ago there is no sign of any signifiant
outburst yet. The latest data I have is for Dec 30.07. The recent
scatter may be real or it may be due to the different systems being used.

If you do manage to get any 9 arcsec photometry despite the current
really bad weather please send it to me.

Nick.

On 27/12/2023 13:13, Nick James wrote:
> Hi all,
>
> It is coming up to 15 days since the last 12P outburst which took place
> sometime around December 14.5. The last few outbursts have been on a 15
> day cadence and so we might be coming up to another one. Richard Miles
> is developing a detailed theory which explains the outbursts and the
> shape of the post-outburst inner coma and observations around the time
> of the outbursts are particularly important.
>
> The weather in southern England has been particularly dull over the
> Christmas period but I've been monitoring the comet using the Alnitak
> CDK 17 in Spain although the weather there has not been particularly
> good either and the Moon has been a problem too. My latest measurements
> from last night using very poor images showed a magnitude of around
> 13.2. Denis Buczynski got similar from his observatory in NE Scotland.
> The attached plot shows the latest observations.
>
> If you have any photometry that you have not yet submitted please send
> it to me. For this lightcurve I need unfiltered or V vs Gaia G measured
> in an approximately 9 arcsec radius aperture. This is our standard setup
> for astrometry using Astrometrica and so you just need to send me the
> photometry report that gets generated at the same time as the astrometry.
>
> Please keep observing this object as frequently as possible so that we
> can pick up the next outburst as it happens.
>
> Thanks,
>
> Nick.
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