2021s4 20241108 kshima

C/2021 S4 (Tsuchinshan)

This comet has a faint tail 0.6’ long p.a.280° so far as 7AU from the Sun. I measured its magnitude m1=17.6.

2024.11.08.65971UT, 20*60s, 40cm RC + F6.5 Focal Reducer, FLI ML8300, no cropping, taken Nagano pref., Japan.