Visibility II / V
Comet C/2017 K2 (PanSTARRS) is quite far away 5.4au from both Earth and Sun. However, comet's nucleus is big, several tens of kilometers and that's why it's quite bright already, m1 around mag 12.5.
Image 1) 15x60s bin2, Baader Clear filter, star stacked, no flats
Image 2) 15x60s bin2, Baader Clear filter, comet optocenter stacked, no flats
Image 3) 12*300s bin2, Semrock 387nm/15nm filter, tracking and stacked to comet optocenter, no flats
Image 4) 3x15x60s bin2, Astrodon RGB, comet optocenter stacked, no flats
Image1 and image2 showing comet through L/Clear filter. 5' tail to PA 11° is visible. Measured m2 brightness 15.0 with aperture radius 6" with filter G/V.
Image3 is showing faint comet coma in near UV 387nm light, negative or minor observation of CN 3883Å gas.
Image4 RGB color image showing comets bluish coma indicating sublimation of carbon monoxide (CO)