Thanks Nick.
I wonder what the rotation period of the nucleus is?

My 10' x 7' close-up image processed first with the Larson-Sekanina filter,
the second using a rotational gradient filter is here on my BAA Members'
Page:
https://britastro.org/node/23409

The frames spanned from 21:50-22:14 UT on 2020 July 20.

Richard

----- Original Message -----
From: "Nick James" <ndj@nickdjames.com>
To: <baa-comet@simplelists.com>
Sent: Tuesday, July 21, 2020 7:11 AM
Subject: Re: [BAA Comets] NEOWISE close-up

> C/2020 F3 (NEOWISE) is now high enough that I can image it using my
> telescope. I start imaging when the sky is bright since any more than 10s
> exposure currently saturates the central part of the coma. There is a lot
> of detail in the inner coma and tail and this is an unsharp masked image
> of the central 0.5 degree showing streamers in the tail and multiple
> shells in the coma.
>
> http://www.nickdjames.com/Comets/2020/2020f3_20200720_2126_ndj.jpg
>
> I remember back in 1997 that Terry Platt produced timelapse movies of the
> inner coma of C/1995 O1 Hale-Bopp showing the shells spiraling out from
> the centre. Here are the stills from that movie:
>
> https://britastro.org/cometobs/1995o1/1995o1_19970328a_platt.html
>
> I also attempted a wide-field image last night using a Sony A7s + Canon
> 85mm, f/1.2L lens but the light pollution here makes processing it very
> difficult. It does show the ion tail stretching back to Merak and Dubhe
> which are the two bright stars in the upper right of this image:
>
> http://www.nickdjames.com/Comets/2020/2020f3_20200720_2242_ndj.jpg
>
> Nick.
>
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