Here's an image of the coma from earlier this evening (Nov 22.7) almost
3 days after its big outburst. The expanding coma has reached a diameter
of around 24 arcsec. The comet is currently 4.90 au away so 1 arcsec is
around 3,500km at the comet. This implies an expansion velocity of 160 m/s.

Nick.

On 21/11/2020 19:57, Peter Carson wrote:
> Hi All,
>
> I’ve attached an image taken last evening with my 315mm reflector showing 29P’s
> “D” shaped coma just beginning to become visible only 34.5 hours after it’s
> outburst. The coma is already 10” dia and should look very different in the
> coming nights.
>
> Peter
>
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