Nick, well done. I have been trying to image the comet for the last several mornings from Arizona as it appears over the mountains with the Sun behind the mountains in bright morning twilight but have failed. I am only using a 38mmFL lens attached to an ASI178MC with various combinations of f-stops to get exposures of 5-30ms. Your magnitude estimate fits well with some of the reasonable reports on COBs. Might I ask what your field of view is in these images.

Cheers, Mike.

> On 01/11/2025 7:58 AM -07 Nick James <ndj@nickdjames.com> wrote:
>
>
> I've just managed to image C/2024 G3 (ATLAS) in daylight from
> Chelmsford, UK using a 90mm refractor and an ASI1600 camera. The
> attached image is a differenced stack of two lots of 20x700us frames
> offset in declination by 23 arcmin. You can see two version of the
> comet, one in positive and one in negative. The orientation is N up and
> the elongation is currently 7.9 deg.
>
> The sun and comet were both low down and the sky rather hazy so I was
> surprised to get such a strong image. I have images of Venus taken just
> before so I should be able to estimate the magnitude.
>
> Nick.
>
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