On the morning of 2025 April 22 Comet C/2025 F2 (SWAN) had brightened a little to magnitude 9.3/9.6 as calculated from a couple different sets of data in an aperture diameter of 3'. What is interesting is that there appears to be clumps or fragments in the images from these calculations, which may account for the comet brightening. These images were collected at an altitude of 5 degrees under nice clear morning skies just as twilight was approaching.

Cheers, Mike.

> On 04/21/2025 8:01 PM -07 Nick James <ndj@nickdjames.com> wrote:
>
>
> Mike,
>
> Many thanks for these images. The comet's nucleus has definitely
> fragmented.
>
> Peter Carson managed to image C/2025 F2 from Spain at a higher
> resolution on 2025 April 21.19. His image shows a diffuse, elongated,
> coma with no distinct photocentre and a brighter bar of material in PA
> 330 degrees.
>
> https://britastro.org/observations/observation.php?id=20250421_202852_3fb2d1e648d24ca4
>
> The ephemeris position is at the head of the bright bar so this consists
> of dust that has flowed tailward from the disrupted nucleus.
>
> The comet's orbit implies that this is a dynamically old object so it
> has previously survived perihelion but not this time.
>
> Nick.
>
> On 22/04/2025 01:15, MIke OLASON - molason at comcast.net (via baa-comet
> list) wrote:
> > A few images from the comet the past few mornings. This morning was very hazy.
>
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