Just to reply to your message from few days ago ...
I'm still fiddeling with collimation, focusing and flat calibrations on a new
RASA 11" and ASI6200MC camera which arrived ten days ago. Anyway, there is no
sign of a condensation on my images from May 1st (30x 30s, 1.26"/pix, FWHM=3.9").

The forward material in anti-tail direction is seen on both images from May 1st
and May 4th and there is even a hint of this feature in images from April 26th.

The appearance of the comet with elongated coma and tail can be seen on this
image: https://ibb.co/r4q4nMX

Thomas Lehmann

> Am Sun, 3 May 2020 08:34:27 +0100
> schrieb Nick James <ndj@nickdjames.com>:
>
> Hi Thomas,
>
> I'll be very interested to see your observations but this feature wasn't
> visible on my images taken on May 1st.
>
> The stacks I used for astrometry are here in an animated GIF:
>
> http://www.nickdjames.com/Comets/2020/2019y4_20200502_ndj.gif
>
> Each of these is 15 minutes long so the star trails are around 26
> arcsec. The object is the faint dot moving with the comet around 22
> arcsec ahead of it.
>
> Nick.
>
>
>
> On 03/05/2020 08:25, Thomas Lehmann wrote:
> >
> > Hi Nick,
> >
> > I still have to reduce my imaging from May 1st ...
> > I'd suggest that you could split your session in two parts and create stacks
> > on the comet separately. This could help verifying if the fragment in question
> > is real or maybe a cosmic in on of your images or something else.
> >
> > Best regards,
> > Thomas
> >
> >> Am Sat, 2 May 2020 23:34:45 +0100
> >> schrieb Nick James <ndj@nickdjames.com>:
> >>
> >> This comet continues to do interesting things!
> >>
> >> My image tonight shows a new fragment 20 arcsec west and 9 arcsec south
> >> of the the main nucleus (component B). The new fragment is around mag
> >> 18.8. The residual nucleus, component B, is currently around magnitude
> >> 15.2. An image showing the fragment is here:
> >>
> >> http://www.nickdjames.com/Comets/2020/2019y4_20200502_2124_ndj.jpg
> >>
> >> Has anyone else imaged this?
> >>
> >> Nick.
> >>
> >>
> >>
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>