This short 30-second movie presents a time-lapse sequence shot on January 24, 2023 of Comet C/2022 E3 (ZTF) - the “green comet” - in motion against the background stars.
I repeat the sequence twice, with the last two clips slowed to 1/2x speed from the 24 frames per second of the first clip. The sequence is made of 120 frames shot over 2 hours, each frame being a 1-minute exposure at a focal length of 250mm. The optics were the William Optics RedCat 51mm f/4.9 astrograph and the camera the Canon R5 at ISO 3200. The field is about 8° x 5° wide.
This was from home in southern Alberta, during a brief window of clear-ish skies this night, though there are still some thin clouds drifting through. Thicker clouds rolled in just after I ended the sequence. You can also see aircraft trails flash through the frame occasionally.
The mount, the Astro-Physics Mach1, was tracking the stars and was autoguided on the stars by the Lacerta MGEN3 autoguider. Unfortunately, I forgot to turn off its dithering routine which shifts the image by a few pixels between each frame, so the images jump around a bit.
Processing was in Adobe Camera Raw and LRTimelapse, with LRTimelapse used to export the developed frames and render the movies.
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