Comet
67P/Churyumov-Gerasimenko was imaged during one night 11-12 Nov, when it was in Gemini near
ψ Gem.
During the imaging session comet was just a week after its perihelia and almost at minimum distance from Earth during 2021 appearance (1.216 a.u. to Sun and 0.416 a.u. to Earth) and was shining at 8.5 mag.
We can definitely see comet's coma (head), lengthy tail and - quite rarely seen phenomena -
antitail. It is another tail that is directed towards the Sun rather than from it and closely connected to comet's large dust particles that Sun couldn't easily blow out far from the orbit. They form disk at comet's orbit which can be seen only during short period of time when Earth crosses comet orbit plane (see
wiki for more explanation)
Comet
67P/Churyumov-Gerasimenko was discovered at 1969 by
Klim Ivanovich Churyumov on images of comet
Comas Solà made by
Svetlana Ivanovna Gerasimenko. Now it is one of the best studied comets. From 2014 till 2016 Rosetta spacecraft was on orbit around the comet nucleus and brought a Philae lander to its surface (all science work of Rosetta mission can be found on
ESA site)
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My basic processing steps i reflect on this
workflow.
It consists of these basic steps:
1) shooting as many frames as you can, color only, without L, in R-G-B-R-G-B-... order
2) shoot the same star area another night, when comet already moved away
3) star align all images (1 and 2)
4) make starfield integration (only images from step 2)
5) make comet alignment with starfield subtraction - this greatly decrease star trails in comet integration
6) integrate comet only images (from step 5)
7) combine integrations from step 4 and 6.
Some CloneStamp cleaning and DBE processing was made after step 6
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