Comet C/2025 A6 (Lemmon) continues to brighten smoothly in our
near-nucleus photometry. Latest lightcurve attached.

Nick.

On 02/09/2025 04:24, Nick James wrote:
> This comet is nicely placed in the morning sky and could become quite
> bright in late October:
>
> https://britastro.org/section_news_item/c-2025-a6-lemmon
>
> The current visual equivalent total magnitudes on COBS show quite a lot
> of scattter:
>
> https://cobs.si/comet/2606/
>
> This is to be expected since the comet is diffuse and the total
> magnitude is quite sensitive to sky conditions and the equipment used.
>
> If you observe the comet and use Astrometrica to do your astrometry
> please use Gaia G and a photometric aperture near to 9 arcsec. We should
> then have a good quality, consistent set of measurements of the
> magnitude of the inner coma. This doesn't reflect the total magnitude of
> the comet but it will allow us to see if anything interesting is going
> on since the dataset is consistent between observers and not too
> affected by sky conditions. It is also a straightforward measurement
> that comes for free with the astrometry that you are already doing.
>
> We've done this for other comets, such as 12P and C/2023 A3 and the data
> has been quite interesting.
>
> https://britastro.org/section_news_item/12p-pons-brooks-lightcurve
> https://britastro.org/section_news_item/c-2023-a3-observing-campaign
>
> If you would like to contribute please send me your ADES and photometry
> files. Please send them as attachments so that they don't get garbled by
> your mail client.
>
> The lightcurve so far, with my data only, is attached. Currently it is a
> very nice fit with very little scatter.