What a great experiment, very well done, Nick! Hope you enjoyed the
eclipse besides hunting for those comets and summer in Argentina.
Will you try to get some photometry out of your images?

Cheers,
Thomas

> Am Fri, 18 Dec 2020 16:23:54 +0000
> schrieb Nick James <ndj@nickdjames.com>:
>
> Hi all,
>
> I've just returned from a trip to Argentina with Astro-Trails for the
> Dec 14 total eclipse. One of the things I wanted to do was capture
> C/2020 S3 (Erasmus) which was 11 degrees west of the Sun and 2 days
> after perihelion. It was probably around 5th mag so quite hard to get.
>
> I set up a Sony A7s camera on a fixed tripod with a 100mm, f/2 lens and
> left it to run during totality on auto. The exposures used were 1/40s
> and it managed around 2 frames/s. This setup gave a FoV of 21x14 deg.
>
> On Dec 13 Worachate Boonplod found a Kreutz sungrazer in the LASCO C3
> images which was designated C/2020 X3 (SOHO), CBET 4897. This sungrazer
> was visible in images taken during the total eclipse by Andreas Moeller.
> Moeller was at the same site as me in Argentina.
>
> I have now processed my images and I have captured both comets, with
> tails, in the stacked eclipse image. The full resolution version of this
> is here:
>
> http://nickdjames.com/eclipse2020/2020x3_20201214_1609_ndj.jpg
>
> The sky and bulk solar corona background has been removed using an r=8
> pixel median subtraction.
>
> Getting one comet during an eclipse is quite unusual. Does anyone know
> of previous cases where two comets were imaged during an eclipse?
>
> Nick.
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