Fig. 17: I'm not quite sure if the dark stripe left of the ion tail an artefact caused by image processing or actual the comets shadow in its own clowd of dust. The star trails show the comets movement during a time period of 40 minutes. Stack of 67 frames with ISO 800 and 30 seconds exposure time, stacked aligned on comet core with Nebulosity from Stark Labs. Postprocessing with Photoshop. Nikon D850 with Nikkor 300mm 2.8D, Ibergeregg, Switzerland 20 July 2020
