Really well done, Nick.

I used to use the same technique trying photometry in the daytime.
300 or more frames are needed to beat down the noise.
The CMOS cameras are well suited for this.

Mechanical shutters would be useless for this type of observation.

Here's for clear skies - there's high pressure building ..
Richard

-----Original Message-----
From: baa-comet@simplelists.com <baa-comet@simplelists.com> On Behalf Of Nick James
Sent: 11 January 2025 18:01
To: baa-comet@simplelists.com
Subject: Re: [BAA Comets] C/2024 G3 (ATLAS) imaged in daylight from Chelmsford, UK

Peter,

Yes, I couldn't image until early afternoon. It would have been marginally better earlier since it would have been a few degrees higher.
Tomorrow it should be brighter but the elongation will be less.

I've now processed this using 300 frames from the video and get the attached image. I get a magnitude of -0.8 in a 40 arcsec diameter aperture using Venus taken with the same settings as a reference. That seems to faint given how prominent the comet is on the image.

Nick.

On 11/01/2025 16:54, Peter Carson wrote:
> Hi Nick,
> Not something I would have thought practical. Well done for trying.
>
> I assume the result would have been better if the weather had allowed
> an image near midday through less atmosphere.
>
> Peter

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