Hi Peter,

Your colour images showing the coma expansion are really interesting.

I did a long run on the comet last night. The magnitude was fairly
constant through the night but the coma expansion was clear. The
attached image is a log stretch at 0.54 "/pix showing the asymmetrical
coma. It is now filling a 32 arcsec diameter photometric aperture.

A rotational gradient shows apparent jet activity, some of which can be
seen in the log image. I'm always very wary of this kind of processing
but the signal is strong. Hopefully people with larger telescopes will
confirm this.

Nick.

On 30/09/2021 00:51, Peter Tickner - peter.tickner1472 at btinternet.com
(via baa-comet list) wrote:
> I'm locked on to 29P in gaps in the clouds and the distinctive horseshoe
> shaped coma can now be seen, the side I detected with a blueish tint
> yesterday is still largely the same and forms the flat edge of the horseshoe
> shape.     (Happy to say I finally dislodged the stuck luminance filter with
> help of my freezer and a small hammer so tonight's images are a series of
> 180seconds unfiltered colour images.    Will post an updated image later to
> compare with yesterday.
>
>
>
> Peter
>
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