Caption of the images

k2-20200912R+IRcolor.jpg
k2-20200912R+IRiso750b.jpg
2020.09.12. Comet C/2017 K2 composite image. 
Asiago Astrophysical Observatory (INAF-OAPD), Copernico 1.82m telescope, Rj and IRj filters. 
Resolution: 1520 km/pixel on the sky plane at the distance of the comet. Stack of ten 300s-exposure images. 
The widest trace in the isophote view corresponds to an ADU value just above the sky background. 



k2-20200912R+IRls45.jpg
k2-20200912R+IRls45dida.jpg
2020.09.12. Comet C/2017 K2. 
Enhancement of the inner coma details with the Larson-Sekanina algorithm centered on the optocenter of the cometary nucleus (alpha = 45°). 
The black and white traces are star trails recorded over the observation time.