Helen,

Thanks. I've measured these images and they show all three components.
The observations from the morning of the 15th show the same bias as the
I79 and I81 observations in RA. The dec is a bit more messy.

The exposures were 60s tracked on the comet and it is moving at around
6"/min at the moment. Would it be possible to get some shorter frames
(say 10 or 15s) tracked on the stars?

Nick.

On 15/11/2025 18:39, Helen Usher - helen.usher at yahoo.co.uk (via
baa-comet list) wrote:
> Hi Nick,
>
> The BAA Work Experience students have made some observations and the
> data are available here Science Archive | Las Cumbres Observatory
> <https://archive.lco.global/?reduction_level=91&proposal_id=LCOEPO2023B-013&target_name=C%2F2025K1&start=2014-01-01&end=2026-01-31%2023%3A59&limit=50&public=true>
> if you want to process them (I'm tied up on other things at the moment)
>
> Best wishes
>
> Helen
>
> On Saturday 15 November 2025 at 11:01:35 GMT, Nick James
> <ndj@nickdjames.com> wrote:
>
>
> This comet was reported to have fragmented on or about November 4 (ATEL
> 17482, 17487, 17488). Recent astrometry shows a significant residual (6
> arcsec on Nov 13) in the position of the main component when compared to
> the orbit solution using astrometry up to November 4. This may be
> biasing of the centroid, but this screenshot shows the measurement I
> made on the morning of November 13 and the main component looks very
> well defined so I don't think that is the case. The radius of the
> aperture is 4.5 arcsec. This observation was made using the Alnitak
> telescope in Spain (I79) and Denis Buczynski got similar results on the
> morning of the 14th.
>
> If anyone has any recent (post November 11) astrometry of this comet
> please forward it to me and the MPC. Astrometry of the main fragment
> (C/2025 K1-B) would also be very useful. It is now well separated from
> the main component.
>
> Thanks,
>
> Nick.
>
>
>
>
>
>
>
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