This is a close-up of Comet Tsuchinshan-ATLAS (C/2023 A3) on October 29, 2024 when it was in Ophiuchus. The field of view is about 2.4º by 1.6º so the tail is at best about 2.5º to 3º long, half the length it was a week earlier.

There's asymmetry in the dust tail, as it extends into a diffuse band below the tail to the south, but has a sharper boundary above the tail, and even a subtle dark band along the top, northern edge. There was no sign of anti-tail, unlike a week earlier when the anti-tail was still present.

The head of the comet exhibits the characteristic cyan or green halo from glowing diatomic carbon. The tail shows some structures emphasized in processing. This is also a blend of short, mid-length, and longer exposures, to retain some detail in the bright head and star-like "nucleus."

Technical:
This is a blend of 4 x 1-minute exposures, 3 x 2-minute exposures (a 4th was trailed), and 4 x 4-minute exposures. The short and mid exposures were aligned on the head and had the stars removed with StarXTerminator. The long exposures were aligned on the stars, so the comet will be blurred somewhat. The short and mid exposures were aligned with the comet head, then blended onto the long-exposure stack with Lights luminosity masks created with Lumenzia.

All taken in quick succession through the Askar APO120 refractor at f/7 and 840mm focal length (as much focal length as I'ved used to shoot a comet in many years!), on the veteran Astro-Physics AP400 mount. All with the Canon R5 at ISO 1600. Autoguided on the stars with the MGEN3 guider. Tail structures emphasized with Nik Color EFX Detail Extractor and PhotoKemi Dark Details action.