12p 20231115 tlhemann

I have obtained images of 12P last night remotely from Italy using a 20cm
f/4.6 reflector. I captured 10 images of 120s each using a green filter.
Unfortunately high clouds were causing extinction of up to 1 magnitude so the
resulting S/N is not as good as expected. The total magnitude is

    2023-11-18.74 UT, m=8.4, d=13'

I am attaching star trail subtracted (non-saturated stars) stacked images and
images processed by a Larson-Sekanina-Filter (all image reduction within
AIRTOOLS software). The comet is at 4.0 days after the outburst.

Top images are showing the inner coma in a field of 6.3'x5.6'. A lot of detail
is revealed by the LS-processed image: two bright curved jets on eastern side
and two faint lobes on the right of the "nucleus" (marked by the white circle)
and the dark curved "shadow" to the east which is already visible in the normal
image.

Bottom images show a wider field of view of 25'x22'. I tried to adjust
brightness and contrast to show both inner coma detail, the large outer coma
resulting from a previous outburst and the tail extending about 0.3 degrees.

What a spectacular object and definitely worth to follow on ...

CS
Thomas Lehmann