Hi Nick,

Yes, I remember the NEOWISE comet and its shadow very well (I was
looking at one of those old images just a few days ago).

Attached a very fast comparison between an old NEOWISE image, the A3
imaged by me on September 24 and the A3 imaged more recently by Luigi.

Honestly, they look very much the same to me.

Clear Skies,
Ernesto

On Sat, Oct 19, 2024 at 10:18 PM Nick James <ndj@nickdjames.com> wrote:
>
> Ernesto,
>
> The "shadow of the nucleus" feature is generally much broader and has
> been seen in many comets. C/2020 F3 (NEOWISE) showed it well. There are
> plenty of examples in the archive for that comet and others:
>
> https://britastro.org/cometobs/2020f3/thumbnails.html
>
> This is a much thinner line that was a continuation of the anti-tail and
> was most prominent at plane crossing so I think it is a different effect.
>
> Nick.
>
>
>
> On 19/10/2024 20:53, walcom77 wrote:
> > Hi Richard, Nick
> >
> > That dark line was visible since at least the end of September in my
> > images. I think it is what they often call in comet literature the
> > "shadow of the nucleus".
> >
> > Clear Skies,
> > Ernesto
>
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