This is a close-up of Comet Tsuchinshan-ATLAS (C/2023 A3) at its best in mid-October 2024 (on October 15), using a 135mm telephoto lens to frame the yellowish head and long dust tail (mixed in with a blue ion tail) and the short forward-facing anti-tail. The field of view is 15º by 10º, so the main tail is at least 10º long extending off the frame at top.

The fuzzy object to the right of the comet head is the globular star cluster Messier 5 in Serpens.

The background sky was lit by the bright waxing gibbous Moon. I have subdued the blue sky and sky gradients to a large degree in processing, but not to the point of making the sky black or "unnatural" looking.

Technical:
This is a stack of 16 exposures (11 x 4 seconds at ISO 400 and 5 x 20 seconds at ISO 100) with the RF135mm lens at f/2.2 on the Canon R5 and on the MSM Nomad star tracker tracking the stars. The comet would not have moved very much relative to the background stars in such a short exposure sequence and at this focal length.

Taken from Arches National Park, Utah on a very clear but bright moonlit night.